Influence Of Different Rootstocks Research Articles

Study of Various Rootstocks and Scion on Leaf Nutrient Status in Mango (Mangifera Indica L.)

The current experiment, entitled “Study of various rootstocks and scions on leaf nutrient status in mango (Mangifera indica L.)” The experiment was framed in RBD (Randomized Block Design) with three replications studied for leaf nutrient analysis. The combination of five rootstocks and three scions, was carried out in the Department of Horticulture (Fruit and Fruit Technology), Bihar Agricultural University, Sabour, Bhagalpur, Bihar, during 2020–21 to evaluate the best combination regarding leaf nutrient content. The appropriate rootstock allows sufficient intake of nutrients and movement while additionally allowing for lesser fertilizer treatment rates, decreasing the possibility of leaching nutrients and toxicity while preserving fruit quality and yield. The analysis of the experiment macronutrient data related to N: P: K content in the leaf of the scion with the influence of different rootstocks has been presented in Table 1. The highest percentage of nitrogen, phosphorus and potassium were observed respectively treatments i.e. T7: Zardalu grafted on Olour (1.62%); T9: Bombay Green grafted on Olour (0.19 %); and T15: Bombay Green grafted on Mahmood Bahar (0.76%), whoever the investigation of micronutrients (Cu, Fe, Mn, and Mg) in leaves of different treatments of rootstocks has been presented in Table 2. The maximum value of copper, iron, manganese and magnesium content of leaf was observed respectively in the treatments i.e. (T13) Zardalu when grafted on Mahmood Bahar (38.33 ppm), (T8) Zardalu grafted on Mylepalium (109.00 ppm), (T4) Zardalu grafted on Mylipalium (0.24 ppm) and (T4) Zardalu grafted on Mylepalium (0.24ppm).

Influence of Different Rootstocks on Fruit Quality and Primary and Secondary Metabolites Content of Blood Oranges Cultivars.

Blood oranges have high concentrations of bioactive compounds that are beneficial to health. In Europe, the cultivation of blood oranges is increasing due to their excellent nutritional properties. In Citrus crops, rootstocks play an important role in juice and can increase the content of bioactive compounds. The morphological, qualitative and nutritional parameters were analyzed in cultivars 'Tarocco Ippolito', 'Tarocco Lempso', 'Tarocco Tapi' and 'Tarocco Fondaconuovo' grafted onto Citrus macrophylla and Citrus reshni. 'Tarocco Lempso' grafted onto Citrus macrophylla obtained the highest values of weight (275.78 g), caliber (81.37 mm and 76.79 mm) and juice content (162.11 g). 'Tarocco Tapi' grafted onto Citrus reshni obtained the most interesting qualitative parameters (15.40 °Brix; 12.0 MI). 'Tarocco Lempso' grafted onto Citrus reshni obtained the most intense red juice (a* = 9.61). Overall, the highest concentrations of primary metabolites were in proline, aspartate, citric acid, and sucrose. The results showed that 'Tarocco Ippolito' juice grafted onto Citrus reshni had the highest levels of total hydroxycinnamic acids (263.33 mg L-1), total flavones (449.74 mg L-1) and total anthocyanins (650.42 mg L-1). To conclude, 'Tarocco Lempso' grafted onto Citrus macrophylla obtained the best values of agronomic parameters, and the cultivars grafted onto Citrus reshni obtained significantly higher concentrations in primary and secondary metabolites.

Componentes de rendimento e atributos físicos da videira ‘BRS Magna’ sobre diferentes porta-enxertos

ABSTRACT ‘BRS Magna’ was released with the aim of improving the colour, sweetness, and flavour of Brazilian grape juice. Therefore, it is necessary to test this cultivar on different rootstocks in order to identify the canopy/rootstock combinations that best contribute to the purpose of the enterprise under cultivation conditions. Thus, the objective of this study was to evaluate the influence of different rootstocks on the yield components and physical characteristics of the bunch and berry of the ‘BRS Magna’ grapevine. The research was conducted in the vineyard established in the experimental area of the Universidade Tecnológica Federal do Paraná (UTFPR), located in the municipality of Pato Branco, Paraná. The ‘BRS Magna’ was grafted onto 10 rootstocks: ‘Kober 5BB’, ‘SO4’, ‘IAC 766 Campinas’, ‘Harmony’, ‘Paulsen 1103’, ‘420A’, ‘IAC 572 Jales’, ‘Freedom’, ‘IAC 313 Tropical’, and ‘101-14 MGT’. For three agricultural years, production, productivity, vegetative vigor, number of bunches, and average bunch weight per plant, length and width of bunch and berry, as well as average berry weight were evaluated. Analysis of variance showed a interaction between rootstocks and production years for all variables. ‘BRS Magna’ showed alternation in yield components, vegetative vigor and physical characteristics of bunch and berry between the evaluated crops. Under the cultivation conditions studied, the recommended rootstock for the ‘BRS Magna’ cultivar is ‘IAC 572 Jales’. On the other hand, ‘101-14 MGT’ and ‘420 A’ are not recommended as rootstock for this cultivar.

CHARACTERIZATION THE INFLUENCE OF THE ROOTSTOCKS SO4, 44-53M, 110R AND FERCAL ON THE VOLATILE COMPOSITION OF RED WINES FROM THE HYBRID VARIETIES STORGOZIA (THREE HARVESTS) AND RUBIN (TWO HARVESTS) IN THE CONDITIONS OF CENTRAL NORTHERN BULGARIA

A gas chromatographic (GC-FID) study to characterize the influence of SO4, 44-53M, 110R and Fercal rootstocks on the volatile composition of red wines from the hybrid varieties Storgozia (harvests: 2017, 2018 and 2019) and Rubin (harvests: 2017 and 2019) under the soil and climatic conditions of Central Northern Bulgaria was conducted. The 110R rootstock in Storgozia has been shown to generate the highest total volatile content (756.10 mg/dm3) in 2017 harvest. 110R also affected the higher alcohols content of Storgozia. It generated the highest content of this indicator (713.00 mg/dm3) again in wines from the 2017 harvest. Regarding the content of esters, aldehydes and terpenes no significant differences were observed between the experimental variants of wines from this grapevine variety. In the case of Rubin wines, a very high final total volatile content was proved at rootstock 44-53M (1717.24 mg/dm3), harvest 2019. The highest concentration of higher alcohols in the 2017 harvest was identified for SO4, while in Rubin - the 2019 harvest, 110R generated the highest presence of higher alcohols. This fraction in both harvests was mainly represented by 2-methyl-1-butanol and 3-methyl-1-butanol. The esters were dominated by ethyl acetate and propyl acetate. In both harvests, the highest total terpene content was found in the wines from SO4 rootstock. The conducted research was evidence of the significant influence of different rootstocks on the volatile composition of wines from hybrid grapevine varieties in the conditions of Central Northern Bulgaria.

Chemical Composition and Antioxidant Capacity of the Fruits of European Plum Cultivar "Čačanska Lepotica" Influenced by Different Rootstocks.

We investigated the influence of different rootstocks on the content of sugars, organic acids, and antioxidant phenolic compounds in the whole fruit and fruit skin of the European plum cultivar “Čačanska Lepotica”. 1H NMR of the fruit extracts allowed for the identification of sucrose, α- and β-glucose, sorbitol, fructose, and malic and quinic acids, while LC–DAD–ESIMS showed the presence of neochlorogenic and chlorogenic acids, cyanidin-3-O-glucoside, cyanidin-3-O-rutinoside, peonidin-3-O-glucoside, peonidin-3-O-rutinoside, hyperoside, isoquercitrin, rutin, and unidentified quercetin-3-diglycoside. The quantitation of the sugars, malic and quinic acids by 1H NMR and phenolic compounds by HPLC–DAD revealed that the rootstock significantly influenced the content of the individual compounds in the fruit skin and fruit. The fruit grafted on “Wavit” rootstock was characterized by significant amounts of neochlorogenic acid, peonidin-3-O-rutinoside, cyanidin-3-O-rutinoside, and sucrose, while the fruit on “GXN-15” was characterized by high levels of sugars, cyanidin-3-O-glucoside, and malic and chlorogenic acids. The fruit skins of plums grafted on “Wavit” were the richest in sugars, organic acids, and phenolic compounds. A good correlation was observed between the content of total phenolics (TPC), flavonoids (TFC), anthocyanins (TAC), and individual phenolic compounds in the extracts of the fruit and the fruit skins and their antioxidant capacity (DPPH, ABTS, and FRAP).

Influence of different rootstocks on quality and volatile constituents of cantaloupe and honeydew melons (Cucumis melo. L) grown in high tunnels

Two rootstock crosses of sweet melon and watermelon (Cucurbita moschata × Cucurbita maxima hybrids), 'Kickstart' and 'Carnivor', grafted onto four melon cultivars (cantaloups; 'Majestic', 'Hunter', 'Honeygoal' and 'Honeyval') were evaluated for quality, phytonutrient composition and volatile compounds in the 2020 and 2021 growing season at two harvests. Grafted fruits showed higher SSC/TA ratio, and antioxidant scavenging activity. Grafted ‘Majestic/Carnivor’ and ‘Honeyval/ Carnivor’ melons significantly increased the ascorbic acid content than the controls. ‘Majestic/Carnivor’ melons showed the highest β- carotene and lutein than the controls. PLS-DA score plots discriminated the grafted cantaloupes and honeydew melons from controls based on the concentration of volatile compounds. Hexyl acetate and hexadecane respectively discriminated the grafted cantaloups and honeydew melons from ungrafted fruits. ‘Carnivor’ rootstocks showed higher expression of volatiles in the grafted cantaloupes and honeydew melons in the heat map. Panellists preferred Majestic/Carnivor’ and ‘Honeyval/ Carnivor’ melons.

Productivity of apple variety Majesti in the foothill zone of Dagestan

The article presents the results of studying the productivity of the parameters of the introduced apple variety Majesti on the clonal rootstock M9 in the agro-ecological conditions of the southeastern foothill sub-province of Dagestan. The purpose of the research is to identify the biological potential of the variety, the adaptive potential for the construction of intensive-type orchards in the industrial horticulture zone. It is especially important to choose the optimal variety-rootstock combinations of apple trees, which should be distinguished by early maturity, annual productivity, high commercial quality of fruits and environmental sustainability. The southeastern foothill sub-province has great prospects for the development of industrial horticulture. Of the unfavorable environmental factors that negatively affect the vital activity of fruit crops, the most often noted are return colds in spring and early frosts in autumn, when fruit plants are still growing. In accordance with the research program of the Federal Agrarian Scientific Center of the Republic of Dagestan, it is envisaged to study the influence of different rootstocks (M9, SK-2, SK-7, MM106) on the productivity of the Majesti variety. Based on the research results, biometric indicators of the growth and productivity of trees in a young garden were determined, depending on the type of planting design. It was noted that at the age of three, the condition of trees on a 5-point scale is good. The height of the trees, depending on the rootstock, reached an average of 2.3 to 2.9 m. On dwarf rootstocks M9, the stem diameter of the Majesti variety was 4.2 cm, of the control variety Renet Simirenko — 3.5. The growth of annual shoots clearly reflects the growth activity of trees with different varieties of rootstock combinations. It has been established that the growth of dwarf rootstocks provides a weakening effect and allows growing lowgrowing trees with a compact crown, a strong stem, that are convenient for earning and harvesting. The largest number of fruit formations was noted in the introduced cultivar Majesti with a 3.0x1.5 planting pattern on a dwarf stock M9 (67 pieces) then in comparison on the control variety Renet Simirenko it was46 pieces. Productivity per tree was 7.1 kg, in the control variety Renet Simirenko — 5.3 kg. Calculated per hectare, productivity of the Majesti variety is 15.7 tons, Renet Simirenko — 11.7 tons.

Desempenho inicial de uvas viníferas 'Rebo' sobre diferentes porta-enxertos e a várias densidades de plantio

Abstract The objective of this work was to evaluate the influence of different rootstocks and planting densities on the initial performance of the yield and quality of the Rebo grapes cultivars grown in a high altitude region of the state of Santa Catarina, Brazil. An experimental design with randomized complete blocks was carried out in a 5×3 factorial arrangement. The treatments consisted of the combination of five rootstocks ('101-14 Mgt', 'IAC 572', 'Paulsen 1103', 'Harmony', and 'VR 043-43') with the 'Rebo' grape, and of three spacing between plants (1.0, 1.2, and 1.5 m). The evaluations took place during the 2018/2019 and 2019/2020 crop seasons. The initial yield variables and the physicochemical characteristics of the grapes were evaluated. The '101-14 Mgt' rootstock provided early shoots, and the 'VR043-43' and 'IAC 572' rootstocks the latest shoots. The '101-14 Mgt' and 'VR043-43' rootstocks provided a higher yield. Plant spacing at 1.0 and 1.2 m increased the initial yield of the vineyard. The '101-14 Mgt' and 'Harmony' rootstocks contributed to the lower total acidity of must. The initial performance of the yield and quality of 'Rebo' wine grape is favored by the '101-14 Mgt' rootstock at the planting densities of 1.0 to 1.2 m.

Influence of Different Rootstocks on Some Quality Parameters of Grafted Melon Seedling

This study was conducted to aim to determine the effects of different rootstocks on some growth characteristics of grafted melon seedling under greenhouse condition in 2020.In the study, four different rootstocks were used: 1-Ungrafted, 2-Ferro, 3-Maximus, and TZ148. Edalı F1 variety (Cucumis melo var. Edalı F1) was used as a scion. The experiment was conducted in a completely randomized block design with three replications. Melon and rootstocks seeds were sown on 28.04.2020 and rootstock seeds on 03.05.2020, respectively. Grafting was done on 15.05.2020. Grafting was performed through the splice grafting method. Some growth characteristics studied on melon seedling was fresh-dry seedling weights (FSW-DSW), stem diameter-height (SD-SH), leaf number-height (LN-LH), fresh-dry root weights (FRW-DRW), root height (RH) and chlorophyll content (CC-SPAD), and some macro-micro nutrient contents. According the results of statistical analyses, the positive differences were found in the grafted seedlings compare to scion at these parameters (p<0.01). In many of the seedling quality values, Ferro and Maximus hybrids stood out temper to others. Also, in the experiment, correlations between FSW and SD, RH, SPAD, and total N content were found significant.

Rootstock affects stress relieving enzymatic activity during bud break in 'Red Globe' grapevine under semi-arid condition

The role of stress relieving enzymes during bud sprouting in grapevines has already been established in different varieties. However, data on 'Red Globe' variety under tropical conditions are not reported. The present study was conducted to generate data on stress relieving enzymatic activities during bud sprout in 'Red Globe' on different rootstocks under arid conditions of India. Influence of different rootstocks on stress relieving enzymes (catalase, peroxidase, ascorbic acid oxidase and polyphenol oxidase) involved in bud sprouting under tropical conditions with double pruning and single cropping pattern was evidenced. Positive interactions were observed between enzymatic activities of stress relieving enzymes, increased bud break (64.25 %) and reduction in days taken to bud sprout (8.43 days). Among the rootstocks under study, vines on 110R and own rooted vines have strong impact on stress relieving enzymes that resulted into early and increased bud sprouting. Also, the dynamics of enzymatic activity can be used as biological indicators for forecasting the end of bud dormancy and recommencement of growth.

Rootstock Affects Scion Nutrition and Fruit Quality during Establishment and Early Production of ‘Honeycrisp’ Apple

‘Honeycrisp’ apple is susceptible to bitter pit, which is associated with fruit mineral nutrient composition. Rootstock genotypes can affect nutrient acquisition, distribution, and fruit yields, which all affect fruit nutrient composition and bitter pit susceptibility. However, the changes of these traits among different rootstock genotypes in response to abiotic stress under semiarid conditions are relatively unknown. The objective of this study was to evaluate the influence of different rootstocks and irrigation on nutrient uptake and partitioning with ‘Honeycrisp’ apple grown in an irrigated, semiarid environment. ‘Honeycrisp’ apple trees were grafted on four different rootstocks, Geneva 41 (‘G.41’), Geneva 890 (‘G.890’), M.9-T337 (‘M.9’), and Budagovsky 9 (‘B.9’), and these were planted at high density (3000 trees/ha). Irrigation was applied as either a water-limited treatment where volumetric soil water content was maintained near 50% field capacity (FC) and a well-watered control where soil water content was maintained near 100% FC. ‘G.890’, the most vigorous rootstock, had lower nitrogen and higher potassium content in leaves, while ‘B.9’, the least vigorous rootstock, had lower potassium and higher nitrogen content. Rootstock genotype did not affect calcium uptake. Interestingly, water-limited conditions increased the nutrient content in root and stems but not in leaves. Water-limited trees partitioned more nitrogen and calcium to roots, while well-watered trees in the control partitioned more nutrients to the stems. Fruit size was the largest for ‘G.890’ and smallest for ‘B.9’. Both ‘G.41’ and ‘G.890’ had higher bitter pit incidence, which was associated with higher potassium content in leaves and fruit. These results suggest that rootstock-induced vigor and irrigation can both contribute to nutrient imbalances in leaves and fruit that could affect the development of physiological disorders in ‘Honeycrisp’ apple.

VERIFICATION OF THE ROOTSTOCK ON THE INFLUENCE ON THE GROWTH AND FRUITING PROCESS TO SOME VARIETIES OF APRICOTS

In order to achieve a balance between growth and fruiting, we need to know the peculiarities of growing and fruiting apricot varieties in different areas of the country, in different climatic conditions and under the influence of different rootstocks. From the analysis of the root system we conclude that varieties with a more developed root system, such as NJA 42 have a higher vigor, and varieties with a more superficial root system, give the trees a lower vigor. Varieties with thicker roots in greater numbers, help the absorption of nutrients from the soil, helping the normal development of trees. The study of the peculiarities of tree growth, can specify the way of cutting the respective species, the optimal choice of the crown shape as well as the way of forming the crown. According to the obtained data, we specify that the first order branches represent 30.6% of the total length of the skeleton, and the second order branches represent 69.2%. In the southern part of the country, the researched apricot varieties have demonstrated their favorability for this area, through superior quantity and quality.

Rootstock Influence on Growth and Mineral Content of Citrus limon and Citrus sinensis cv. Valencia Inoculated with Candidatus Liberibacter Asiaticus

Huanglongbing (HLB) reduces the growth and development of citrus and induces changes in secondary metabolites such as flavonoids, limonoids, and polyamines. Likewise, infected plants have a deficient absorption of nutrients such as zinc, potassium, manganese, and copper. Therefore, the objective of this study was to evaluate the influence of different rootstocks on morphology and mineral changes of Citrus limon and Citrus sinensis cv. Valencia plants inoculated with Candidatus Liberibacter asiaticus. In a greenhouse of the Experimental Station-Autonomous University of Tamaulipas, the Candidatus Liberibacter asiaticus bacteria were inoculated to Citrus limon plants (growing on Citrus volkameriana, Citrus macrophylla, and Citrus aurantium rootstocks) and Citrus sinensis cv. Valencia (growing on Citrus volkameriana and Citrus aurantium rootstocks). The experiment was established under a completely randomized design with 45 graft/rootstock repetitions. In each graft/rootstock combination, the plant height and stem diameter were determined using a tape measurer and a Vernier, respectively. In addition, the nutrient content of foliar samples was determined by an X-ray fluorescence spectrometer. In both citrus species, the C. aurantium rootstock promoted a higher concentration of the bacteria. On the other hand, the rootstock that showed the best agronomical results after inoculation with the bacteria was C. volkameriana, presenting the least variation in mineral content and conferring greater plant height (15%) and stem diameter (23%). In contrast, the presence of Ca. Liberibacter asiaticus decreased S content and increased Cu concentration in C. lemon plants. Similarly, plants infected with C. sinensis presented higher Fe content. Finally, in both species, no significant differences were observed for Mn, P, and Zn concentration.

Influence of different rootstocks on growth characteristics of cultivars of the species Prunus domestica in nursery

Influence of different rootstocks on growth characteristics of cultivars of the species <i>Prunus domestica</i> in nursery

Study on Cold Tolerance of Different Rootstocks of Melon Seedlings

The higher compatibility rootstocks of melon were selected and the influence of different rootstocks on increasing the cold resistance of grafted melon seedlings was investigated. The influence of different rootstocks on chilling tolerance of grafted melon seedlings and its physiological mechanisms were studied, including chilling injury index, content of chlorophyll, MDA, and electrolytic leakage under the different temperature (13°C/8°C, 9°C/4°C, 25°C/15°C) conditions. At the same time, Pumpkin ‘Japanese Cedar F1’, ‘Japanese Developed Root Sprouts Wood’, ‘Alam’ was used as rootstock for melon ‘Haojie 6’ in this experiment, and the own-root seedling was used as control. The results showed that Pumpkin ‘Alam’ used as rootstock material could improve the survival rate of grafted seedlings and the chilling tolerance of melon seedlings significantly.

Influence of Rootstocks on Winter-Hardiness of Plum Generative Buds During the Wintering Period in Two Growing Regions

Abstract The selection of appropriate rootstock is the main precondition for obtaining a high yielding and sustainable plum orchard. In the Northern climate, plum overwintering is especially important, where winter hardiness of flower buds is one of indicators. This investigation was carried out during three wintering periods (2010–2013) at the Institute of Horticulture in Pūre (Latvia) and the Polli Horticultural Research Centre (Estonia), in orchards planted in 2001. The aim of the investigation was to evaluate the influence of different rootstocks on the viability of flower buds during winter for two plum cultivars in two growing regions. European plum ‘Victoria’ and hybrid plum ‘Kubanskaya Kometa’ grafted on eight clonal and eight seedling rootstocks were used in the investigation. Bud samples were taken two times during winter: end of January and end of March. The viability of flower buds and flowering intensity were determined in the laboratory. The viability was determined as dehydrogenase activity using triphenyl tetrazole chloride (0.5%), where in living cells the colourless substance due to enzymatic activity turns into a brightly coloured product — formasan. The optical density of colour was determined with a spectrophotometer at 485 nm. Both cultivars ‘Kubanskaya Kometa’ and ‘Victoria’ had higher flower bud viability in Polli compare to Pūre. In both growing regions, the highest activity of dehydrogenases for cultivar ‘Kubanskaya Kometa’ was on rootstocks ‘Myrobalan’, ‘St. Julien INRA 2’, ‘Wangenheims Zwetsche’ and for cultivar ‘Victoria’ — on rootstocks ‘Ackermann’, ‘Brompton’ seedlings, and ‘St. Julien d’ Orleans’. The dehydrogenase activity of in flower buds had a tendency to decrease during winter.

Quality and antioxidant potential of ‘BRS clara’ and ‘Arizul’ grapes influenced by rootstocks in a tropical region

ABSTRACT Seedless table grapes cultivars have been studied in the Sub-middle region of São Francisco Valley at northeast Brazil. For that region, it is important to identify cultivars with productive potential, better quality and efficiency, minimizing the expenses in terms of inputs and workforce, when compared to traditional cultivars. Specifically, the objective of this study was to determine the influence of different rootstocks on the quality and on the antioxidant potential of BRS Clara and Arizul table grapes cultivars of two production cycles. The experimental area belongs to the Experimental Field of Bebedouro/Embrapa Semiárido, located in the sub-middle region of São Francisco Valley, in Petrolina - PE, northeast Brazil. Both BRS Clara and Arizul cultivars were analyzed individually using IAC 313, IAC 572, IAC 766, SO4, Paulsen 1103 and Harmony rootstocks, during production cycles from October/2016 to February/2017 and from March/2007 to June/2017. The experimental design was planned in randomized blocks, in a 2 (production cycle) x 6 (rootstock) factorial, with three replications each. More favorable conditions to quality for ‘BRS Clara’ grapes, as evidenced by higher berry mass, lower soluble solids (SS)/titratable acidity (TA) ratio and higher antioxidant activity, were observed after the March-June, 2017 harvest, especially from scions grafted onto IAC 572, SO4 and Harmony. The Arizul cultivar was characterized by better quality after the March-July, 2017 harvest, showing higher berry mass, lower acidity and lower SS/TA ratio and a better color mainly in SO4 and Harmony rootstocks. Therefore, an appropriate rootstock enhances the quality of the grapes.

English

English

Influence of different rootstocks on yield precocity and fruit quality of ‘Tarocco Scirè’ pigmented sweet orange

Abstract Several studies in citrus-producing countries are currently being carried out to select and evaluate rootstocks that are tolerant to Citrus Tristeza Virus (CTV) and can be adopted in different citrus production areas. An evaluation of rootstock suitability must consider the productive and qualitative features as well as the adaptability to varied environmental conditions (i.e., soil characteristics). Additionally, some varieties present qualitative aspects that are appreciated by consumers but can be affected by the use of different rootstocks. In Italy, the qualitative traits of pigmented or blood oranges, which are characterized by the presence of anthocyanins in the peel and flesh, are strongly influenced by several factors, including the scion/rootstock combination. The objective of this study was to evaluate and compare the influence of ten rootstocks on yield precocity and fruit quality of ‘Tarocco Scire’ pigmented sweet orange in a Sicilian area within the Protected Geographical Indication (GPI) “Arancia Rossa di Sicilia” production district. Five of the ten rootstocks, namely, ‘Bitters’, ‘Carpenter’, ‘Furr’, ‘F6P12®’ and ‘F6P13′, have recently been released and produced good yields in limiting soil conditions. In this study, the important role of rootstock in determining the organoleptic quality, specifically the sugar content, and the anthocyanin concentrations in both the pulp and the juice was demonstrated. Some of the rootstocks that were recently introduced in Italy, i.e., ‘Bitters’ and ‘Furr’, were promising because they positively influenced several agronomic and qualitative parameters in the tested conditions, positively affected the yield precocity and enhanced the fruit juice anthocyanin content. Overall, these results contribute to the assessment of the role of different rootstocks in the post-CTV Italian citrus industry.

Influence of Rootstocks on Plum Productivity in Different Growing Regions

Abstract Proper selection of rootstock that is adapted to local growing conditions and climate is one of the most important preconditions for obtaining high yield in intensive plum orchards. The aim of the investigation was to evaluate the influence of different rootstocks on the productivity of two plum cultivars: ‘Kubanskaya Kometa’ (Prunus rossica. Erem.) and ‘Victoria’ (P. domestica L.) in different climatic conditions. The following sixteen rootstocks known in Europe were used in the trial: eight vegetatively propagated (‘St. Julien A’, ‘Brompton’, ‘Ackermann’, ‘Pixy’, ‘GF 8/1’, ‘G 5/22’, ‘GF 655/2’, ‘Hamyra’) and eight generatively propagated (‘St. Julien INRA2’, ‘St. Julien d’Orleans’, ‘St. Julien Noir’, ‘Brompton’, ‘Wangenheims Zwetsche’, ‘St. Julien Wädenswil’, ‘Myrobalan’, P. cerasifera var. divaricata). The evaluation was made in experimental orchards in Latvia, Estonia and Belarus. Orchards were established in spring 2001. Trees were planted at spacing 3 × 5 m in four replications, three trees per plot. The data obtained in years 2008-2015 are presented. The yield was influenced by rootstock and differed between years, growing regions and cultivars. The meteorological conditions during wintering period had significant influence on yield for trees on all evaluated rootstocks.