New Varieties Of Maize Research Articles

New corn resistant lines to stalk rot disease (Dickeya zeae) in Indonesia

Abstract. Suriani, Patandjengi B, Muis A, Junaid M, Mirsam H, Azrai M, Efendi R, Sebayang A. 2023. New corn resistant lines to stalk rot disease (Dickeya zeae) in Indonesia. Biodiveritas 24: 3190-3200. Stalk rot disease caused by Dickeya zeae is one of the important diseases of corn in Indonesia. Host resistance cultivars are an effective and sustainable control measure of the disease. Therefore, the present study aimed to evaluate the resistance of 15 S1 hybrid maize lines to stalk rot disease. The research was conducted in two seasons (DS and WS) using a randomized block design with 3 replications. The D. zeae suspension with 108cfu/mL concentration was inoculated into the plant test 45 Days After Planting (DAP). Disease incidence and severity were observed during the two seasons. The results showed that all tested lines were infected with stalk rot disease but had various resistance reactions. Disease incidence and severity in the dry season were higher than in the rainy season. In the rainy season all test lines followed the 3 models of disease development, but in the dry season, all lines followed the monomolecular model. Further analysis showed that 3 lines of hybrid maize had the lowest AUDPC value with a protection index of more than 50% in two growing seasons. Stalk lignin content had negative correlation with a disease incidence of -0.60877, so it can be used as a parameter of plant resistance to disease. Tested lines that show resistance to the disease could potentially be useful as new varieties of maize.

2000\xa0years of agriculture in the Atacama desert lead to changes in the distribution and concentration of iron in maize

We performed a histological and quantitative study of iron in archaeological maize seeds from prehispanic times recovered from Tarapacá, Atacama Desert. Also, we examined iron distribution changes at the cell level in embryos from ancient versus new varieties of maize. Our results show a progressive decrease in iron concentration from the oldest maize to modern specimens. We interpret the results as an effect of prehispanic agriculture over the micronutrient composition of maize.

Combining ability and genetic diversity under low-temperature conditions at germination stage of maize (Zea mays L.)

Low temperatures are important for the production of spring maize in northern China. While the low-temperature tolerance of maize seeds can be improved by coating them, this can result in environmental pollution, high costs, and instability. Therefore, identifying new varieties of maize is the most effective method of improving the ability of maize crops to withstand low temperatures. In this experiment, four low-temperature tolerant maize inbred lines (DNF266, Zhong 451, B73, Dan 340) and four low-temperature sensitive maize inbred lines (Luyuan 92, Ji 853, Huangzaosi, Si 144) were selected from the northern spring maize area. The griffing double-row hybridization design method was used to prepare 28 hybrid combinations. After analysing the general combining ability and the special combining ability of each combination, we found that the indoor low-temperature index and low-temperature seedings were extremely similar for all combinations. The hybridization and parental inbred lines were subjected to low-temperature treatments under both laboratory conditions and in the field. Several low-temperature indexes were assessed to identify what results could be produced from combining them. Under both treatments, the inbred line DNF266 had a higher general combining ability and the Zhong 451 × Dan 340 hybrid combination had a higher special combining ability. These results provide technical support for breeding new low-temperature varieties of maize.

Explanatory note on the selection of forage material suitable for the risk assessment of GM feed of plant origin

EFSA Supporting PublicationsVolume 15, Issue 1 1366E Technical reportOpen Access Explanatory note on the selection of forage material suitable for the risk assessment of GM feed of plant origin European Food Safety Authority (EFSA), European Food Safety Authority (EFSA)Search for more papers by this authorMichele Ardizzone, Michele ArdizzoneSearch for more papers by this authorClaudia Paoletti, Claudia PaolettiSearch for more papers by this authorElisabeth Waigmann, Elisabeth WaigmannSearch for more papers by this author European Food Safety Authority (EFSA), European Food Safety Authority (EFSA)Search for more papers by this authorMichele Ardizzone, Michele ArdizzoneSearch for more papers by this authorClaudia Paoletti, Claudia PaolettiSearch for more papers by this authorElisabeth Waigmann, Elisabeth WaigmannSearch for more papers by this author First published: 29 January 2018 https://doi.org/10.2903/sp.efsa.2018.EN-1366Citations: 6 Requestor: EFSA Question number: EFSA-Q-2017-00614 AboutPDF ToolsExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL References Allen VG, Batello C, Berretta EJ, Hodgson J, Kothmann M, Li X, McIvor J, Milne J,. Morris C,. Peeters A and Sanderson M, 2011. An international terminology for grazing lands and grazing animals. Grass and Forage Science, 66, 2– 28. EFSA GMO Panel (EFSA Panel on Genetically Modified Organisms), 2011. EFSA Panel on Genetically Modified Organisms (GMO); Scientific Opinion on Guidance for risk assessment of food and feed from genetically modified plants. EFSA Journal 2011; 9(5):2150, 37 pp. https://doi.org/10.2903/j.efsa.2011.2150 U Meier (ed.), 2001. Growth stages of mono-and dicotyledonous plants, 2nd edition. BBCH Monograph. Federal Biological Research Centre for Agriculture and Forestry, Bonn, Germany. McDonald P, Edwards RA, Greenhalgh JFD, Morgan CA, Sinclair LA, Wilkinson RG, 7th ed., 2011. Animal Nutrition,. Pearson education limited. OECD (Organisation for Economic Co-operation and Development), 2002a. Consensus document on compositional considerations for new varieties of sugar beet: key food and feed nutrients and anti-nutrients. Series on the Safety of Novel Foods and Feeds, No. 3. ENV/JM/MONO(2002)4 OECD (Organisation for Economic Co-operation and Development), 2002b. Consensus document on compositional considerations for new varieties of maize (Zea maize): key food and feed nutrients, anti-nutrients and secondary plant metabolites. Series on the Safety of Novel Foods and Feeds, No 11. ENV/JM/MONO(2004)16. OECD (Organisation for Economic Co-operation and Development), 2009. Consensus document on compositional considerations for new varieties of cotton (Gossypium hirsutum and Gossypium barbadense): key food and feed nutrients and anti-nutrients. Series on the Safety of Novel Foods and Feeds, No 11. ENV/JM/MONO(2004)16. OECD (Organisation for Economic Co-operation and Development), 2011. Revised consensus document on compositional considerations for new varieties of low erucic acid rapeseed (Canola): key food and feed nutrients, anti-nutrients and toxicants. Series on the Safety of Novel Foods and Feeds, No. 24. ENV/JM/MONO (2011)55. OECD (Organisation for Economic Co-operation and Development), 2012. Revised consensus document on compositional considerations for new varieties of soybean [Glycine max (L.) merr.]: Key food and feed nutrients, anti-nutrients, toxicants and allergens. Series on the Safety of Novel Foods and Feeds, No. 25. ENV/JM/MONO(2012)24 OECD (Organisation for Economic Co-operation and Development), 2015. Safety assessment of foods and feeds derived from transgenic crops, Volume 1, novel food and feed safety, OECD publishing, Paris. Citing Literature Volume15, Issue1January 20181366E ReferencesRelatedInformation

Profiling of differentially expressed proteins in mature kernels of Korean waxy corn cultivars using proteomic analysis

Maize (Zea mays L.) is the most important crop such as food for humans and feed for animals. Although new varieties of maize have been extensively developed in Korea, little is known about differences in the proteomes of mature kernels among maize varieties. Three Korean waxy corn cultivars (Ilmichal, Eolrukchal 1, and Heukjinjuchal) have previously been developed. The total protein content is higher in Ilmichal than in Eolrukchal 1 or Heukjinjuchal, while the starch and fatty acid contents are similar among these three Korean waxy corns. To uncover the differences in proteomic profiles among these three Korean waxy corns, we performed proteomic analysis and compared their protein compositions. We detected 37 differentially expressed protein spots and identified the proteins using MALDI-TOF mass spectrometry. Of these proteins, 37.8 % were identified as storage proteins, 18.9 % as stress-related proteins, and 18.9 % as metabolism-related proteins. Storage proteins (globulin-2) and stress-related proteins (heat shock proteins and general stress proteins) were highly expressed in Ilmichal or Heukjinjuchal. Semi-quantitative reverse transcription-polymerase chain reaction (RT-PCR) analysis of corresponding genes of five randomly selected proteins, including glyoxalase family protein (accession number, B6SGF3), globulin-2 (Q7M1Z8), heat shock protein 1 and 3 (B6TGQ2 and B6TDB5), and vicilin-like embryo storage protein (Q03865), showed that the expression levels of the tested genes were well-correlated with protein abundance, suggesting that these proteins are also differentially regulated at the transcriptional level. Taken together, these results provide a better understanding of proteomic differences among Korean waxy corn cultivars and may support further molecular breeding efforts.

Estimating the Efficiency of Maize Farmers in Ghana

A lot of investment has been made in the agricultural sector of Ghana to increase agricultural production through the introduction of new technologies. However, it has been observed that despite efforts being made by the government through the introduction of new varieties of maize the productivity of maize farmers is generally low. This study sought to assess the efficiency of farmers in the Nkoranza area. The study employed the stochastic frontier model by using a onestage process in Frontier computer programme and using cross-sectional data of the 2008 major cropping season. Socio-economic and management practices that influence technical efficiency were determined. Input elasticities as well as allocative efficiency of the farmers were also determined. A mean technical efficiency of 91 percent was obtained for maize farmers. There was a distinct variability in mean technical efficiency among farmers cultivating the improved variety and those cultivating the local variety. Variety of maize cultivated by the farmer, sex of the farmer, experience of maize farmer, distance of the farm from the farmers’ residence and number of times a farmer gets extension visits were found to have significant effect on technical efficiency. Allocatively, maize farmers were found to be over utilizing labour but under utilizing

On-farm comparison of improved maize variety Manakamana-3 with Local Thulo Seto for grain yield and agronomic attributes at Dukuchhap, Lalitpur, Nepal

On-farm studies were carried out at Dukuchhap, (1100-1500 m), Lalitpur, an Outreach Research Site of Khumaltar complex during 2006-2007 full season maize growing (May-Sep). The study consisted of comparison among grain yield, and agronomic attributes between Manakamana-3, an improved OPV and Local Thulo Seto maize varieties. Field surveys were conducted to gather information on aforesaid attributes of these maize varieties. In 2006, data were recorded from 265 plants for Local Thulo Seto and 131 plants from different fields for Manakamana-3 while in 2007 they were recorded from 180 plants for both varieties. The result of the study revealed that both of these varieties were comparable for grain yield and ear length. However, combined analysis over years for plant and ear height, ear fill, and ear circumference showed a highly significant result. It was also recorded that plant height, ear height and ear filled remained dynamic between these varieties over years. Plant height of Local Thulo Seto was exceptionally tall up to 364 cm compared to Manakamana-3 which attained a plant height up to 241 cm. The most important yield parameter of grain weight/ear was not affected due to years and varieties. Bivariate relationship among grain yield and agronomic attributes showed that grain weight/ear was highly correlated with ear length (r=0.73**), ear fill (r=0.75**), and ear circumference (r=0.63**). Ear height was not correlated with grain yield. It was also observed that plant height has a negative relationship with grain yield and ear attributes except for ear height which was positively correlated with plant height. Maize variety Thulo Seto is popular in Dukuchhap where area coverage of this variety is more than 80% in the locality. There is a serious limitation of this variety at Dukuchhap because of stalk lodging which was severe in 2006 as a result around 80% plants have the problem of stalk lodging. Farmers preferred this variety because it is resistant to early drought which is another problem for maize growing at Dukuchhap. Therefore, if we improve population of Thulo Seto in farmers’ field and reduce plant height of this variety by way of population improvement there is no need of introducing new varieties of maize in immediate future at Dukuchhap and similar domain in Lalitpur. DOI: http://dx.doi.org/10.3126/ajn.v1i0.7537 Agronomy Journal of Nepal (Agron JN) Vol. 1: 2010 pp.10-15

ECONOMIC AND BIOLOGICAL REVENUE OF MAIZE EXPERIMENTS (In Arabic)

Two field experiments were carried out at Agricultural Research Station of Gimmaza in (2002-2003,2003-2004) seasons to study the economic and biological production efficiency for new ten hybrids white and yellow maize. Different rates of nitrogen fertilizer were used to evaluate the biologic revenue with economic revenue The study showed that there was an increasing in total production although the cultivated area was decreased through the years (2002-2003,2003-2004), this indicates the high production of new varieties of maize. The gap of maize production was about 5.1 million ardab in year (2004). The study showed that the importance of the height achievement net revenue of verities and hybrid maize. The net revenue average of single hybrid-10 reached about 1498 LE / feddan, but biological revenue was about 30 ardab/ feddan, where the economic revenue of thirdly hybrid-326 reached about 1515 LE/ feddan and the biological revenue reached 31 ardab / feddan. The thirdly hybrids 326,327,325 should be cultivated to achieve higher biological revenue, while thirdly hybrid-326 and single hybrid-10 achieved higher economic revenue by applying 120 singular/feddan of the nitrogen fertilizer.

Inheritance of Plant and Ear Height in Maize (Zea Mays L.)

Plant and ear height are very important characters not only for describing new varieties of maize (Zea mays L.), but for green and dry matter production, and even for grain yield. Significant positive correlations have been reported by various authors between plant height and stover yield, plant height and dry matter yield, and plant height and grain yield. The height of the main ear is also correlated to plant height. It depends on the variety or the environment, but is likely to be the same height within a population. Many environmental and agronomical factors (e.g. plant density, fertilization, pests and diseases) influence the expression of these characters, which are not quality traits. Their expression is controlled by many genes and by the interactions between these genes. The heritability of these traits is high and they show significant genotypic variability and positive heterosis, as reported in many research publications.

Rural reforms and changes in land management and attitudes: a case study from inner Mongolia, China.

The international science community stresses the importance of the local perspective in the context of dryland degradation. This paper explores changes in management and attitudes in a mixed farming system in northern China, since the introduction of the economic reforms in the early 1980s, and the following changes in land-use rights. The area encompasses a dune landscape scattered with crop-land, as well as the Daqinggou Nature Reserve, an area of natural vegetation. According to farmers new varieties of maize in combination with increased use of fertilizers have improved yields, though high yield variability persists due to erratic rainfall. Farmers acknowledge the importance of the 30-year contract on cultivated land in 1997 for their investment in long-term management, but emphasize the importance of chemical fertilizers for short-term economic survival. The farmers stressed the negative impact of grazing and cultivation on soil erosion and stated that differences in vegetation composition and cover in the nature reserve are due to anthropogenic factors.

The resistance of new varieties of maize to post-harvest infestation by Sitophilus zeamais Motsch and Sitophilus oryzae (L.)

SUMMARYThe indices of susceptibility of five new varieties of maize: TZE 3 (3·01), TZE 4 (6·69), TZSR (5·58) developed at the International Institute of Tropical Agriculture, Ibadan, and MSRB-W (9·53) and MSC-opaque (5·0) at the National Cereals Research Institute, Ibadan, showed that the yellow variety, TZE 3, is the most resistant to post-harvest infestation by Sitophilus zeamais Motsch and Sitophilus oryzae (L.), the latterbeing the more abundant species.Emerging F1 generation adults of either species of Sitophilusdeveloped longer, and were more numerous in soaked maize seeds without testa than in unsoaked, intactmaize seeds. Seed germinability declined as the number of holes per maize seed caused by adult insect emergence increased.

The Archaeological Record of Chili Peppers (Capsicum spp.) and the Sequence of Plant Domestication in Peru

AbstractStudy of archaeological material of chili peppers (Capsicum spp.) from the sites of Huaca Prieta and Punta Grande on the coast of Peru has shown that the first species to be cultivated was C. baccatum, which was probably domesticated in Bolivia. This pepper reached the Peruvian coast during the same period as four other crop plants of probably southern Peruvian or Bolivian origin, which suggests that southern contacts were important during the late Preceramic stage. During the Initial period, maize (probably of Mexican origin) and peanuts (possibly domesticated in Bolivia) spread along the coast. Another pepper, Capsicum chinense, which is thought to have been domesticated in the lowlands of the Amazon Basin, apparently also reached the coast at about the same time as pottery. Manioc likewise arrived on the coast during this period, and there may have been an introduction of new varieties of maize from Mexico. These crops suggest a mixture of tropical forest and Middle American contacts during the Initial period and the Early horizon.