Improving Tolerance to Abiotic Stresses in Staple Crops: A Random or Planned Process?

Edmeades, G.O.; Bänziger, Marianne; Campos, Hugo; Schussler, Jeffrey R.

doi:10.1002/9780470752708.ch21

Cited by 37 publications

(35 citation statements)

References 64 publications

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“…They suggested that stress adaptive mechanisms were not exposed until yields were reduced by 30 to 50% under stress. In this study, average mean yields of testcrosses in each trial under drought stress represented 37 to 55% of the average yield of hybrids under wellwatered conditions which fall within the range of 30 to 50% yield reduction suggested by Edmeades et al (2006). Therefore, the top 10 DH testcrosses identified in the present study from each population might have adaptive traits for drought tolerance and have the potential to be utilized in breeding for drought tolerance in SSA.…”

Section: Discussionsupporting

confidence: 55%

“…CIMMYT and other partners in Eastern and Southern Africa have been working to improve tropical maize germplasm for both drought stress and low nitrogen tolerance for the last three decades (Bänziger et al, 2000;Makumbi et al, 2011;Worku et al, 2012). Edmeades et al (2006) reported that the phenotypic correlation between elite hybrid yields under managed drought stress versus well-watered conditions declined as stress intensified, with yield reduction reaching 50%. They suggested that stress adaptive mechanisms were not exposed until yields were reduced by 30 to 50% under stress.…”

Section: Discussionmentioning

confidence: 99%

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Hybrids performance of doubled haploid lines derived from 10 tropical bi-parental maize populations evaluated in contrasting environments in Kenya

Beyene¹,

Mugo²,

Oikeh³

et al. 2017

Afr. J. Biotechnol.

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The doubled haploid (DH) technology enables maize breeders to develop a large number of homozygous lines rapidly and test them in hybrid combinations early in the breeding cycle. The objectives of this study were to evaluate testcross performance of 556 DH lines derived from 10 diverse tropical backcross (BC 1 ) populations, and to estimate variance components and broad-sense heritability under both well-watered and managed drought-stress conditions in Kenya. The 556 DH testcrosses were divided into six trials, with each trial comprising 84 to 126 entries and six commercial checks developed through conventional pedigree method. Trials were evaluated at 3 or 4 well-watered (WW) and two managed drought-stress (WS) sites in 2012 using an alpha lattice design with three replications per environment. Test crosses of the DH lines showed significant differences in grain yield and other agronomic traits. In the combined analysis across the WW locations, the top 10 DH testcrosses from each trial gave 0.6 to 32.7% higher grain yield than the best commercial check. Under managed drought-stress condition, the top 10 DH testcrosses from each trial gave 11.8 to 40.9% more grain yield than the best check. The best DH lines identified in the study could be used in tropical maize breeding programs in Africa for improving grain yield and drought-tolerance. Following evaluation in advanced testing and national performance trials (NPT), a total of 36 hybrids involving DH lines from this study were recommended for commercial cultivation in east and southern Africa.

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Section: Discussionsupporting

confidence: 55%

Section: Discussionmentioning

confidence: 99%

Hybrids performance of doubled haploid lines derived from 10 tropical bi-parental maize populations evaluated in contrasting environments in Kenya

Beyene¹,

Mugo²,

Oikeh³

et al. 2017

Afr. J. Biotechnol.

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“…Edmeads et al (2004) também reportaram que a correlação do rendimento de grãos entre híbridos de milho obtidos sob condições com e sem estresse por deficiência hídrica diminui em função da intensidade da deficiência hídrica aplicada. Isso pode ser decorrente do fato de que, nessas condições (deficiência hídrica severa), o genótipo não consegue expressar sua produtividade potencial, indicando a necessidade da avaliação direta da produtividade sob estresse por deficiência hídrica, nos programas de melhoramento de plantas.…”

Section: Impacto Da Deficiência Hídrica Na Produtividade De Grãosunclassified

Padrões de deficiência hídrica para a cultura de milho (safra normal e safrinha) no estado de Goiás e suas conseqüencias para o melhoramento genético

et al. 2009

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RESUMODeficiência hídrica é considerada a maior restrição na produção e estabilidade da produtividade de culturas em muitas regiões do mundo. No Estado de Goiás, região na qual predomina a produção em sequeiro, para a cultura do milho (Zea mays L.) implantada na safra normal e na safrinha, é comum sofrer períodos de estresse por deficiência hídrica intermitente ou terminal, que reduzem o rendimento de grãos. No processo de desenvolvimento de novos híbridos e variedades cultivadas, genótipos são selecionados em função de sua adaptabilidade em um determinado ambiente alvo. Assim, programas de melhoramento vegetal, com o objetivo de desenvolver híbridos e variedades cultivadas mais adaptados a um determinado ambiente, requerem informações sob a probabilidade de ocorrência dos diferentes tipos de deficiência hídrica, como também, suas características, intensidade e tempo, em função da fase fenológica da cultura. Um modelo de simulação de culturas foi utilizado para determinar os padrões de deficiência hídrica no estado de Goiás, considerando 12 locais e 6 diferentes datas de semeadura para a cultura do milho semeada na safra normal e na safrinha. Para a cultura do milho semeado na safra normal, a perda na produtividade decorrente do estresse por deficiência hídrica foi menor que 50%, sendo que os tipos de deficiência hídrica que provocam um maior impacto na produtividade iniciam-se no começo do período reprodutivo. Para o milho semeado na safrinha, a perda na produtividade é superior a 50%, sendo mais comum o estresse terminal, que tem sua maior intensidade no enchimento de grãos. Termos para indexação: Modelos de crescimento, Zea mays, cerrado, veranico, estresse hídrico. ABSTRACTWater stress is a major constraint to crop production and yield stability in many regions of the world. The cultivation of corn (Zea mays L.) in the Brazilian State of Goiás, is frequent affected by periods of water stress resulting in yield reduction. During the process of developing new hybrids and cultivated varieties, new genotypes are selected based on their adaptability for a certain environment. In this context, plant breeding programs demand for information regarding as a function of the crop phenological phases. A crop simulation model was used to determine patterns of water stress for 12 locations of the State of Goiás and 6 different sowing for both, first and second corn harvest periods. For the first harvest period, yield loss due to water stress was lower than 50%, with higher effects on yield in the beginning of the reproductive period. For corn as a second crop, yield loss is higher than 50% with frequent occurrence of terminal stress, which presented higher intensity during the stage of grain filling.

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“…Drought however, like many other environmental stresses had adverse effects on some morphological characters including plant height, stem girth, number of leaves, and is one of the major constraints limiting the maize production. Low water availability is one of the major causes of yield loss of crops in majority of the planting regions around the world (Edmeades, 2004;Olawuyi et al, 2011;Olowe et al, 2013;Olawuyi et al, 2014;Bello et al, 2014). In spite of this, there is need to develop quality and high yield genotypes with drought tolerant trait in temperate and tropical environments, especially in SubSaharan Africa where drought is a threat to maize production.…”

Section: Introductionmentioning

confidence: 99%

Progress From Selection of Some Maize Cultivars’ Response to Drought in the Derived Savanna of Nigeria

Olawuyi

Bello

Ntube³

et al. 2015

Agrivita.J.Agr.Sci

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Field experiments were conducted to investigate the variations in sixteen maize genotypes in relation to drought tolerance. The experimental set up was subjected to drought stress after five weeks of planting for three weeks before data on morphological and yield characters of maize genotypes were obtained for three cropping years. Plant height and grain yield of Bodija yellow maize were the highest overall. There was a significant difference among genotypes for drought stress resistance and Bodija yellow maize showed the most tolerance, while TZBR Comp 1 -C1 S2 510 genotype was the least. First principal component axis (Prin 1) had the highest contribution to the variation of the morphological, yield and drought tolerance traits. Prin 1 was highly related to the morphological and yield characters more than to the drought resistance. Plant height was negatively and strongly correlated (p<0.01) with stem height, number of leaves, stem girth, leaf length, leaf width and week after planting, but negatively correlated with the drought resistance. Therefore, Bodija yellow maize should be considered as parent material in breeding for the development of drought tolerant traits in maize.

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Improving Tolerance to Abiotic Stresses in Staple Crops: A Random or Planned Process?

Cited by 37 publications

References 64 publications

Hybrids performance of doubled haploid lines derived from 10 tropical bi-parental maize populations evaluated in contrasting environments in Kenya

Hybrids performance of doubled haploid lines derived from 10 tropical bi-parental maize populations evaluated in contrasting environments in Kenya

Padrões de deficiência hídrica para a cultura de milho (safra normal e safrinha) no estado de Goiás e suas conseqüencias para o melhoramento genético

Progress From Selection of Some Maize Cultivars’ Response to Drought in the Derived Savanna of Nigeria

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