Marsh Seedless Grapefruit Research Articles

Delay expression of limonoid UDP-glucosyltransferase makes delayed bitterness in citrus

Genes encoding limonoid UDP-glucosyltransferase from albedo of six Citrus species with different levels of delayed bitterness are isolated and cloned in vector pTZ57R/T. Our results indicate that gene sequence of sweet lime (with intense juice delayed bitterness) have complete identity with Satsuma mandarin (without distinctive juice delayed bitterness). Also gene sequence of Marsh seedless grapefruit, local orange and Thompson navel orange (with mild juice delayed bitterness) have very similarity with Satsuma mandarin. On the other hand, this gene started to express 60, 120, and 210 days after full blooming in albedo of Satsuma mandarin, sweet oranges and sour orange, and both grapefruit and sweet lime, respectively. Expression pattern of limonoid glucosyltransferase gene in leaves was quite different with albedo. Thus, we supposed the delayed bitterness in this species was related to delay in expression of limonoid glucosyltransferase gene in albedo and lower limonoid glucoside accumulation in fruits.

Evaluation of Marsh seedless grapefruit on ten rootstocks in São Paulo, Brazil

Introduction. The Brazilian citrus industry is characterized by orange production for processing, with the Rangpur lime (Citrus limonia L. Osbeck) as the predominant rootstock. Grapefruit (Citrus paradisi Macf.) is cultivated on a small scale and represents one of the less studied citrus species. Using other rootstock alternatives to Rangpur lime could increase fruit production and quality. Materials and methods. Ten citrus (Troyer citrange, Swingle citrumelo, Cleopatra mandarin, Valencia Americana sweet orange, Volkamer lemon cv. Catania 2, Nacional and Florida rough lemons, Rangpur lime, Thornton tangelo and trifoliate orange) were evaluated as rootstocks for the Marsh seedless grapefruit in an experiment planted at the Citrus Experimental Station of Bebedouro (EECB), Sao Paulo State, Brazil, in January 1991. The spacing was 8.0 m between rows and 4.0 m between trees. The experimental design, randomized blocks, presented four replications with three trees per plot. Trees were grown without supplementary irrigation. Yield was evaluated from 1994 through 2000; fruit quality from 1994 through 1999; the tree size in May 2000. Results. For each studied characteristic, the various rootstocks showed significant differences, except for the average weight of the fruit. The data obtained were compared with the results already published in the Brazilian literature. Conclusion. Swingle, Troyer, Cleopatra and trifoliate orange could be used as alternative rootstocks for Marsh seedless grapefruit.

NOTES ON PHYLLOCNISTIS CITRELLA STAINTON (LEPIDOPTERA: PHYLLOCNISTIDAE) ATTACKING FOUR CITRUS VARIETIES IN DARWIN

Abstract Phyllocnistis citrella Stainton occurred throughout the year at Darwin in the Northern Territory and attacked more than half of the new leaves produced on 4 varieties of citrus. A mean of 5.9 eggs per leaf was recorded, with 32.7% on the upper surface. Only 5.2% of larvae pupated, with most succumbing to crowding. During the hottest months the life cycle was completed in 14–18 days. Citrus paradisi Macfadyen (var. Marsh's seedless grapefruit) was the most susceptible of the citrus varieties examined.

Effect of girdling date on fruit size of Marsh Seedless grapefruit

SummaryThe effects of autumn (prior to bloom), spring (mid-bloom) and summer (post-‘June- drop’) girdles on fruit size were determined. Other than the effect on fruit number, it was found that autumn girdles reduced fruit size, spring girdles had little effects, but those done in summer increased fruit size. Based on these observations, a sequence is proposed of the major events and effects occurring in the tree after girdling.

Regulating pre-harvest fruit drop and the duration of the harvest season of grapefruit with 2,4-D and GA

SummaryThe effects of 2,4-D, GA and their combinations on pre-harvest fruit drop and the duration of the harvest season of Marsh Seedless grapefruit were evaluated. Pre-harvest fruit drop increased as the season advanced and had two main peaks: in August and in December, about 10 and 14 months respectively after fruit setting. Total accumulated fruit drop amounted to 34% during the ten months after treatment; of this amount 6% occurred in the first five months and 28% in the latter five months. When applied in May all treatments reduced fruit drop to various degrees, the combined 2,4-D+GA sprays being most effective. The combined sprays were also most effective in delaying rind aging which was related to rind pigments and resistance to puncture, thus extending the harvest season by up to ten months without any unfavourable effects on juice quality. However, a second 2,4-D spray in July had no effect on fruit drop or harvest extension. None of the treatments used affected the alternate cropping pattern of ...

Título en español.

El efecto en el crecimiento y rendimiento del chino (naranjo dulce) Valencia, el toronjo Marsh seedless y ortanique de seis portainjertos, se estudió en un experimento iniciado en Jamaica en 1965. Los resultados de esta investigación revelaron que, dentro de las condiciones de suelo y clima en que se realizó, los patrones de limonero rugoso (rough lemon) y de limero Rangpur fueron los más vigorosos, siguiéndoles el mandarino Cleopatra; mientras que el chino (naranjo) trifoliado decididamente fue el más débil. El naranjo agrio, tan extensamente usado como patrón, fue relativamente lento en crecimiento y casi igual al citrange Troyer en cuanto a vigor. Los datos de rendimiento recolectados en un período de 3 años entre 1969 y 1972 demostraron que con el patrón de naranjo agrio se lograron rendimientos de china (naranja dulce) Valencia, toronja Marsh seedless y ortanique tan buenos como con los más vigorosos de limonero rugoso y limero Rangpur, y a la vez mejores que con mandarino Cleopatra, citrange Troyer y chino (naranjo) trifoliado.

Synthetic regulators of carotenoid biosynthesis in Citrus paradisi

The ability of 16 amines to induce carotenoid biosynthesis in Marsh seedless grapefruit is correlated with the octanol-water partition coefficient and the Hammett constants. The compounds fall into three series: p-RC 6H 4COOCH 2CH 2NEt 2 (R = H, NH 2, CN, NO 2, MeO, Me, tert-Bu, F, Cl, Br), p-RC 6H 4CH 2NEt 2 (R = H, Me, NO 2), and RC 6H 4OCH 2CH 2NEt 2 (R = o-Me, m-Me, p-Me). Total carotene content increased up to 12-fold. Lycopene, not normally accumulated, became a major pigment. The benzoates caused up to a 24-fold increase in the β-carotene content. Except for the larger accumulation of cyclic carotenes, the mode of action of these amines appears to be similar to that of 2-(4-chlorophenylthio triethylamine hydrochloride.

Performance of Marsh Seedless Grapefruit on Six Rootstocks in Cyprus

SummaryYield, fruit quality, growth and the levels of 12 elements in the leaves were measured for 12-year-old Marsh Seedless grapefruit trees on six rootstocks. Trees on rough lemon and Cleopatra mandarin were larger than those on sour orange and consistently produced 67 and 23 per cent more fruit respectively than on sour orange. Trees on Palestine sweet lime, Troyer and Morton citranges were the least productive. Three-year means of total soluble solids ranged from 9·4 per cent for fruit from trees on Palestine sweet lime to 11–2 per cent on Cleopatra mandarin. Fruit size was good on all rootstocks but effects of rootstock on levels of Mg, Na, Cl and B in the leaves were statistically significant.

Structure--activity relationships of chemical inducers of carotenoid biosynthesis

Fifteen amines having a profound effect on carotenogenesis in Marsh seedless grapefruit are reported. The compounds fall into three series: Et 2N(CH 2) n Me ( n = 4–8), Et 2N(CH 2) n Ph ( n = 1–5), and Et 2NCH 2CH 2OC 6H 4R (R=H, p-Me, p-Et, p-iso-Pr, p- tert-Bu), There was up to an 11-fold increase in the total carotene content. Lycopene, not normally accumulated, became a major pigment. The inducing ability of the amines on carotenoid biosynthesis is correlated with the octanol-water partition coefficient. The mode of action appears to be similar to that of 2-(4-chlorophenylthio)triethylamine hydrochloride.

New chemical inducers of carotenoid biosynthesis

Five compounds having a striking effect on the color of Marsh seedless grapefruit are reported. The compounds, namely [β-(diethylamino)-ethoxy]-benzene, [γ-(diethylamino)-propoxy]-benzene, [δ-(diethylamino)-butoxy]-benzene, 4-[β-(diethylamino)-ethoxy]-benzaldehyde, and diethylaminoethyl anisolate caused a 5- to 12-fold increase in the carotene content. Lycopene, not normally accumulated, became the major pigment. The mode of action appears to be similar to that of CPTA.

Induced color changes in grapefruit and orange

The fruits of Marsh seedless grapefruit and navel orange do not normally accumulate lycopene. After treatment with 2-(4-chlorophenylthio)triethylamine hydrochloride (CPTA) both fruits accumulate large amounts of lycopene. CPTA appears to stimulate the lycopene pathway. It does not, however, appear to influence the terpenoid flavoring constituents present in the peel oil.

Carotenoids in Flavedo of Marsh Seedless Grapefruit

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarotenoids in Flavedo of Marsh Seedless GrapefruitHenry. Yokoyama and M. J. WhiteCite this: J. Agric. Food Chem. 1967, 15, 4, 693–696Publication Date (Print):July 1, 1967Publication History Published online1 May 2002Published inissue 1 July 1967https://doi.org/10.1021/jf60152a041RIGHTS & PERMISSIONSArticle Views99Altmetric-Citations37LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (384 KB) Get e-Alerts Get e-Alerts

The Use of Nitrate Reductase Activity for the Appraisal of Nitrogen Status and Productivity of Grapefruit Orchard Trees

Abstract Mature Marsh seedless grapefruit trees on Sour orange stock planted in a loamy soil were subjected to three levels of nitrogen fertilization with and without phosphate or chicken manure added. The details of the experimental plan and tree responses during the five-year experimental period will be described elsewhere. Briefly, the phosphate and manure treatments resulted in a significant increase in yield and in improved fruit quality. As far as the leaf composition is concerned, the phosphate and manure treatments caused an increase in the P and a decrease in the N content of the leaves, thus producing a completely inverse relationship between leaf N concentration and the yield of the corresponding trees. This situation served as an opportunity to test—under orchard. conditions—the validity of NaR (nitrate reductase) assay in leaves as a measure for some “active fraction” of leaf nitrogen and as a parameter for tree productivity. The use of the NaR assay has been suggested for the determination of N requirements of citrus trees (1).

The Use of Nitrate Reductase Activity for the Appraisal of Nitrogen Status and Productivity of Grapefruit Orchard Trees

Abstract Mature Marsh seedless grapefruit trees on Sour orange stock planted in a loamy soil were subjected to three levels of nitrogen fertilization with and without phosphate or chicken manure added. The details of the experimental plan and tree responses during the five-year experimental period will be described elsewhere. Briefly, the phosphate and manure treatments resulted in a significant increase in yield and in improved fruit quality. As far as the leaf composition is concerned, the phosphate and manure treatments caused an increase in the P and a decrease in the N content of the leaves, thus producing a completely inverse relationship between leaf N concentration and the yield of the corresponding trees. This situation served as an opportunity to test—under orchard. conditions—the validity of NaR (nitrate reductase) assay in leaves as a measure for some “active fraction” of leaf nitrogen and as a parameter for tree productivity. The use of the NaR assay has been suggested for the determination of N requirements of citrus trees (1).

Further Light on the Origin of the Marsh Seedless Grapefruit

Further Light on the Origin of the Marsh Seedless Grapefruit