Person: Vivek, B.
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Vivek
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B.
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Vivek, B.
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0000-0002-2492-6751 35 results
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- Maternal effects, reciprocal differences and combining ability study for yield and its component traits in maize (Zea mays L.) through modified diallel analysis(PeerJ Inc., 2024) Bonipas Antony John; Kachapur, R.M.; Naidu, G.K.; Talekar, S.C.; Rashid, Z.; Vivek, B.; Patne, N.; Shiddappa Ramappa Salakinkop; Prema Gu
Publication - Genetic trends in CIMMYT’s tropical maize breeding pipelines(Nature Publishing Group, 2022) Prasanna, B.M.; Burgueño, J.; Beyene, Y.; Makumbi, D.; Asea, G.; Woyengo, V.; Tarekegne, A.T.; Magorokosho, C.; Dagne Wegary Gissa; Ndhlela, T.; Zaman-Allah, M.; Matova, P.M.; Mwansa, K.; Mashingaidze, K.; Fato, P.; Chere, A.T.; Vivek, B.; Zaidi, P.; Vinayan, M.T.; Nagesh, P.; Rakshit, S.; Kumar, R.; Jat, S.L.; Singh, S.B.; Kuchanur, P.; Lohithaswa, H.C.; Singh, N.K.; Koirala, K.B.; Ahmed, S.; San Vicente Garcia, F.M.; Dhliwayo, T.; Cairns, J.E.
Publication - Contribution of root system architecture and function in the performance of tropical maize (Zea mays L.) genotypes under different moisture regimes(Southern Cross Journals, 2022) Zaidi, P.; Seetharam, K.; Vinayan, M.T.; Rashid, Z.; Krishnamurthy, L.; Vivek, B.
Publication - CIMMYT Maize DH Facilities & DH Line Development Service to Partners(CIMMYT, 2021) Prasanna, B.M.; Vivek, B.; Chaikam, V.
Publication - Beat the stress: breeding for climate resilience in maize for the tropical rainfed environments(Springer, 2021) Prasanna, B.M.; Cairns, J.E.; Zaidi, P.; Beyene, Y.; Makumbi, D.; Gowda, M.; Magorokosho, C.; Zaman-Allah, M.; Olsen, M.; Das Aparna; Regasa, M.W.; Gethi, J.; Vivek, B.; Nair, S.K.; Rashid, Z.; Vinayan, M.T.; Issa, A.B.; San Vicente Garcia, F.M.; Dhliwayo, T.; Xuecai Zhang
Publication - Stress-resilient maize for climate-vulnerable ecologies in the Asian tropics(Southern Cross Publishing, 2020) Zaidi, P.; Nguyen, T.; Dang Ngoc Ha; Thaitad, S.; Ahmed, S.; Arshad, M.; Koirala, K.B.; Rijal, T.R.; Kuchanur, P.; Patil, A.; Mandal, S.S.; Kumar, R.; Singh, S.B.; Bhupender Kumar; Shahi, J.P.; Patel, M.B.; Gumma, M.K.; Pandey, K.; Chaurasia, R.; Haque, A.; Seetharam, K.; Das, R.R.; Vinayan, M.T.; Rashid, Z.; Nair, S.K.; Vivek, B.
Publication - Genome-wide association studies in tropical maize germplasm reveal novel and known genomic regions for resistance to Northern corn leaf blight(Nature Publishing Group, 2020) Rashid, Z.; Sofi, M.; Harlapur, S.I.; Kachapur, R.M.; Dar, Z.A.; Singh, P.K.; Zaidi, P.; Vivek, B.; Nair, S.K.
Publication - Molecular breeding for nutritionally enriched maize: status and prospects(Frontiers, 2020) Prasanna, B.M.; Palacios-Rojas, N.; Hossain, F.; Muthusamy, V.; Menkir, A.; Dhliwayo, T.; Ndhlela, T.; San Vicente Garcia, F.M.; Nair, S.K.; Vivek, B.; Xuecai Zhang; Olsen, M.; Fan, X.M.
Publication - Genomic regions associated with root traits under drought stress in tropical maize (Zea mays L.)(Public Library of Science, 2016) Zaidi, P.; Seetharam, K.; Krishna, G.; Krishnamurthy, L.; Gajanan, S.; Babu, R.; Zerka, M.; Vinayan, M.T.; Vivek, B.An association mapping panel, named as CIMMYT Asia association mapping (CAAM) panel, involving 396 diverse tropical maize lines were phenotyped for various structural and functional traits of roots under drought and well-watered conditions. The experiment was conducted during Kharif (summer-rainy) season of 2012 and 2013 in root phenotyping facility at CIMMYT-Hyderabad, India. The CAAM panel was genotyped to generate 955, 690 SNPs through GBS v2.7 using Illumina Hi-seq 2000/2500 at Institute for Genomic Diversity, Cornell University, Ithaca, NY, USA. GWAS analysis was carried out using 331,390 SNPs filtered from the entire set of SNPs revealed a total of 50 and 67 SNPs significantly associated for root functional (transpiration efficiency, flowering period water use) and structural traits (rooting depth, root dry weight, root length, root volume, root surface area and root length density), respectively. In addition to this, 37 SNPs were identified for grain yield and shoot biomass under well-watered and drought stress. Though many SNPs were found to have significant association with the traits under study, SNPs that were common for more than one trait were discussed in detail. A total 18 SNPs were found to have common association with more than one trait, out of which 12 SNPs were found within or near the various gene functional regions. In this study we attempted to identify the trait specific maize lines based on the presence of favorable alleles for the SNPs associated with multiple traits. Two SNPs S3_128533512 and S7_151238865 were associated with transpiration efficiency, shoot biomass and grain yield under well-watered condition. Based on favorable allele for these SNPs seven inbred lines were identified. Similarly, four lines were identified for transpiration efficiency and shoot biomass under drought stress based on the presence of favorable allele for the common SNPs S1_211520521, S2_20017716, S3_57210184 and S7_130878458 and three lines were identified for flowering period water-use, transpiration efficiency, root dry weight and root volume based on the presence of favorable allele for the common SNPs S3_162065732 and S3_225760139.
Publication - Gains in maize genetic improvement in Eastern and Southern Africa: II. CIMMYT open-pollinated variety breeding pipeline(Crop Science Society of America (CSSA), 2017) Masuka, B.; Magorokosho, C.; Olsen, M.; Atlin, G.; Banziger, M.; Pixley, K.V.; Vivek, B.; Labuschagne, M.; Matemba-Mutasa, R.; Burgueño, J.; MacRobert, J.; Prasanna, B.M.; Das, B.; Makumbi, D.; Tarekegne, A.T.; Crossa, J.; Zaman-Allah, M.; Biljon, A.; Cairns, J.E.Open-pollinated varieties (OP Vs) still represent a significant proportion of the maize (Zea mays L.) seed system in many countries of sub- Saharan Africa. The International Maize and Wheat Improvement Centre (CIMMYT) has been breeding improved maize varieties for the stress-prone environments experienced by most smallholder farmers in eastern and southern Africa for over 30 yr. Hybrid breeding is now the major focus of the CIMMYT breeding pipeline. However, OP Vs are generated within the hybrid pipeline. This is the first study to document genetic gain for maize grain yield under both optimal and stress (random and managed drought, low nitrogen [N], and maize streak virus [MSV]) conditions within the CIMMYT eastern and southern African OP V breeding pipeline. Genetic gain was estimated using the slope of the regression on the year of OP V release in regional trials over a 12-yr period (1999–2011). Open-pollinated varieties were separated into two maturity groups, early (<70 d to anthesis) and intermediate-late (>70 d to anthesis). Genetic gain in the early maturity group under optimal conditions, random drought, low N, and MSV was 109.9, 29.2, 84.8, and 192.9 kg ha−1 yr−1. In the intermediate-late maturity group, genetic gain under optimal conditions, random drought, low N, and MSV was 79.1, 42.3, 53.0 and 108.7 kg ha−1 yr−1. No significant yield gains were made under managed drought stress for both maturity groups. Our results show continued improvement in OP Vs for both yield potential and stress tolerance.
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