Person: Jeffers, D.P.
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Jeffers
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D.P.
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Jeffers, D.P.
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0000-0003-4362-6137 13 results
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- Mining alleles for tar spot complex resistance from CIMMYT's maize Germplasm Bank(Frontiers, 2022) Willcox, M.; Burgueño, J.; Jeffers, D.P.; Rodriguez-Chanona, E.; Guadarrama, A.; Kehel, Z.; Chepetla, D.; Shrestha, R.; Swarts, K.; Buckler, E.; Hearne, S.; Charles Chen
Publication - Workgroup report: Public health strategies for reducing aflatoxin exposure in developing countries(Public Health Services, 2006) Strosnider, H.; Azziz-Baumgartner, E.; Banziger, M.; Bhat, R.V.; Breiman, R.; Brune, M.N.; DeCock, K.; Dilley, A.; Groopman, J.; Hell, K.; Henry, S.H.; Jeffers, D.P.; Jolly, C.; Jolly, P.; Kibata, G.N.; Lewis, L.; Xiumei Liu; Luber, G.; McCoy, L.; Mensah, P.; Miraglia, M.; Misore, A.; Njapau, H.; Ong, C.N.; Onsongo, M.T.K.; Page, S.W.; Park, D.; Patel, M.B.; Phillips, T.D.; Pineiro, M.; Pronczuk, J.; Rogers, H.S.; Rubin, C.; Sabino, M.; Schaafsma, A.; Shephard, G.; Stroka, J.; Wild, C.; Williams, J.T.; Wilson, D.L.
Publication - Detección de la marchitez bacteriana de maíz, Pantoea stewartii (Smith) Mergaert, Verdonck y Kersters, en el Valle Central de México(Sociedad Mexicana de Fitopatología, 2004) Valencia-Torres, N.; Mezzalama, M.; Leyva Mir, S.G; Jeffers, D.P.
Publication - Acción genética de la resistencia al achaparramiento de maíz causado por espiroplasma, fitoplasmas y virus(Sociedad Mexicana de Fitopatología, 2002) Mendoza Elos, M.; López Benítez, A.; Rodríguez Herrera, S.A; Oyervides Garcia, A.; De Leon, C.; Jeffers, D.P.
Publication - Combining ability of yellow lines derived from CIMMYT populations for use in subtropical and tropical midaltitude maize production environments(Crop Science Society of America (CSSA), 2018) Fan, X.M.; Yu-Dong Zhang; Jeffers, D.P.; Ya-Qi Bi; Kang, M.; Xing-Fu YinThe introduction and utilization of new maize (Zea mays L.) germplasm from sources, such as the International Maize and Wheat Improvement Center (CIMMYT), can be valuable for broadening the genetic base of breeding populations through the introgression of new alleles. Twenty-five inbred lines, derived from CIMMYT breeding populations, were selected on the basis of grain color, resistance to turcicum leaf blight, and per se line performance in Yunnan. To use the lines effectively, information on their performance in hybrid combinations and on general combining ability (GCA) and specific combining ability (SCA) needed to be obtained. The objectives of this study were (i) to evaluate these lines for grain yield (GY) in hybrid combinations and determine GCA of parental lines and SCA of crosses between the 25 introduced lines and six testers using North Carolina Design II; and (ii) to classify the lines into different maize heterotic groups. The field testing at three locations identified crosses with lines from Cateto and Population 147 (P147) as having significantly higher GY than those from SA3 and other introduced populations, and the high GY was largely attributable to their high positive GCA effects. Lines from the same population were not necessarily classified into same maize heterotic group. Lines selected at S4 or a later generation would be expected to have more stable GCA effects than lines selected in earlier generations.
Publication - QTL Mapping for gray leaf spot resistance in a tropical maize population(American Phytopathological Society (APS), 2016) L.Liu; Zhang, Y.D.; Li, Y.Q.; Bi, Y.Q.; Yu, L.J.; Fan, X.M.; Tan, J.; Jeffers, D.P.; Kang, M.A tropical gray leaf spot (GLS)-resistant line, YML 32, was crossed to a temperate GLS-susceptible line, Ye 478, to produce an F2:3 population for the identification of quantitative trait loci (QTL) associated with resistance to GLS. The population was evaluated for GLS disease resistance and flowering time at two locations in Yunnan province. Seven QTL using GLS disease scores and six QTL using flowering time were identified on chromosomes 2, 3, 4, 5, and 8 in the YML 32 × Ye 478 maize population. All QTL, except one identified on chromosome 2 using flowering time, were overlapped with the QTL for GLS disease scores. The results indicated that QTL for flowering time in this population strongly corresponded to QTL for GLS resistance. Among the QTL, qRgls.yaas-8-1/qFt.yaas-8 with the largest genetic effect accounted for 17.9 to 18.1 and 11.0 to 21.42% of variations for GLS disease scores and flowering time, respectively, and these should be very useful for improving resistance to GLS, especially in subtropical maize breeding programs. The QTL effects for resistance to GLS were predominantly additive in nature, with a dominance effect having been found for two QTL on the basis of joint segregation genetic analysis and QTL analysis.
Publication - Introgression of the crtRB1 gene into quality protein maize inbred lines using molecular markers(Springer, 2015) Liu Li; Jeffers, D.P.; Zhang, Yudong; Ding, M.; Wei Chen; Kang, M.; XingMing, F.Quality protein maize (QPM; Zea mays L.) has effectively enhanced levels of the amino acids, lysine, and tryptophan, over normal maize and provided balanced dietary protein for the health and development of monogastric animals and humans. However, as in normal maize, QPM varieties are low in provitamin A (ProVA), a precursor of vitamin A, which can lead to vitamin A deficiency in humans when maize is a significant part of their diet. In this study, maize inbred Hp321-1 carrying the favorable alleles crtRB1-5′TE-2 and crtRB1-3′TE-1 that can enhance levels of ProVA, was used as donor for improving ProVA in QPM inbred lines CML161 and CML171. Functional markers for identifying the favorable alleles crtRB1-5′TE-2 and crtRB1-3′TE-1 were used in foreground selection, and simple sequence repeat markers were used in background selection for the BC1F1, BC2F1, and BC2F2 generations. The background recovery rates were 77.4 and 84.5 % for CML161 and CML171 populations, respectively, in the BC1F1 generation, and 89.9 and 92.1 % in the BC2F2 generation. With foreground and background selection, the mean ProVA concentration has been improved from 1.60 µg g−1 in the parent of CML161 to 5.25 µg g−1 in its BC2F3 offspring, from 1.80 µg g−1 in the parent of CML171 to 8.14 µg g−1 in its BC2F3 offspring while maintaining similar QPM characteristics of the recurrent parents. The success from this study offers maize breeders a procedure for increasing ProVA in QPM lines, which will greatly mitigate vitamin A deficiency and protein-energy malnutrition in developing countries.
Publication - Combining ability analysis of RILs developed from a YML32 × Q11 cross for grain yield and resistance to gray leaf spot(Crop Science Society of America (CSSA), 2018) Li, Z.W.; Liu Li; Zhang, Y.D.; Jeffers, D.P.; Kang, M.; Fan, X.M.The development of resistant lines and hybrids is an economical way to control disease and improve yield stability. The objectives of this study were (i) to investigate if differences in resistance to gray leaf spot (GLS, caused by Cercospora zeina) exist among recombinant inbred lines (RILs) with and without the quantitative trait locus encompassing the resistance-carrying GZ204/IDP5 DNA segment (RDNAS) and to determine its effect on grain yield, and (ii) to determine general combining ability and specific combining ability effects for grain yield and GLS scores (GLSS). Four RILs (three with RDNAS [RL1_1, RL1_2, and RL2_1] and one without RDNAS [RL2_2]) were developed via marker-assisted selection from a cross between YML32 and Q11?an elite line susceptible to GLS. The four RILs and the susceptible parent (Q11) were crossed as testers with 13 maize (Zea mays L.) lines of known heterotic groups (Suwan1, Reid, and non-Reid). The three RDNAS-carrying RILs showed reduced GLSS and improved grain yield stability, but grain yield itself was not significantly increased. These three RILs also showed negative general combining ability effects for GLSS. RL2_1 was the best line for improving GLS resistance. The RILs possessing the RDNAS in crosses with lines from the Suwan1 heterotic group had lower GLSS than those from Reid and non-Reid heterotic groups, suggesting that resistance genes or quantitative trait loci, in addition to RDNAS, might be present in Suwan1.
Publication - El complejo del achaparramiento de maíz(CIMMYT, 2016) Loladze, A.; Jeffers, D.P.; Castillo, A.; Muñoz, C.
Publication - Addressing climate change effects and meeting maize demand for Asia(GMRI, 2011) Zaidi, P.; Babu, R.; Cairns, J.E.; Jeffers, D.P.; Kha, L.Q.; Krishna, G.; Krishna, V.; Mcdonald, A.; Ortiz-Ferrara, G.; Palacios-Rojas, N.; Pixley, K.V.; Prasanna, B.M.; Rashid, Z.; Tadele Tefera; Tiwari, T.P.; Vinayan, M.T.; Vengadessan, V.; Fan, X.M.; Yunbi Xu; Weidong, C.; Zhang, S.; Vivek, B.This includes the extended summaries of the scientific presentations made during the 11th Asian Maize Conference held in Nanning, China, during 7-11 November 2011. The Conference is co-organized by the International Maize and Wheat Improvement Center (CIMMYT), and the Guangxi Maize Research Institute (GMRI), China. The theme of the workshop is "Addressing Climate Change Effects and Meeting Maize Demand for Asia". The 11th AMC brings together over 300 maize scientists, researchers and students from public and private sectors, including participants from several Asian countries, including Bangladesh, Bhutan, China, Colombia, India, Indonesia, Iran, Nepal, Philippines, Thailand, Turkey, Vietnam, besides Italy, Kenya, New Zealand, Mexico, Germany, Myanmar and the USA. The Conference features over 225 presentations, including keynote lectures, invited oral presentations, and poster presentations, besides scientific deliberations and discussions on maize in Asia. The extended summaries includes reviews and research papers on a diverse range of topics, including maize trends, challenges and opportunities in Asia, abiotic and biotic stresses affecting maize production, novel tools for maize improvement, conservation agriculture, nutritional enrichment of maize, participatory plant breeding, community-based seed production, public-private partnerships, maize value chains, policies and socio-economics relevant to Asia.
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