Dissecting heat stress tolerance in tropical maize (Zea mays L.)

Alam, Mufid; Seetharam, K.; Zaidi, P.H.; Dinesh, Akula; Vinayan, M.T.; Nath, Ujjal Kumar

doi:10.1016/j.fcr.2017.01.006

Cited by 100 publications

(74 citation statements)

References 32 publications

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“…Tassel blasting is a recognized symptom of heat and drought stress, but studies involving the genetic control of TSBL are few. The estimated heritability for TSBL was 0.90, similar to the estimate of 0.99 in a set of diverse tropical maize inbred lines (Alam et al, 2017). One QTL for TSBL was detected on chromosome 5; no QTL were detected for RSS.…”

Section: Discussionsupporting

confidence: 75%

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Genetic Mapping of Foliar and Tassel Heat Stress Tolerance in Maize

McNellie

Chen

et al. 2018

Crop Science

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The frequency of heat stress events is expected to increase, further complicating the challenge of feeding a growing population. A better understanding of the genetic and molecular mechanisms of heat stress tolerance in maize (Zea mays L.) would facilitate the development of heat‐tolerant cultivars. To address this knowledge gap, we evaluated two biparental recombinant inbred line (RIL) populations (B73 × NC350 and B73 × CML103) for leaf and tassel heat tolerance traits. Two foliar traits, leaf firing and leaf blotching, were evaluated at three vegetative growth stages. In B73 × NC350, two tassel traits, tassel blasting and reduction in spikelet size, were scored at flowering. We detected 22 quantitative trait loci (QTL), 15 in B73 × NC350 and seven in B73 × CML103. We previously observed that the development of leaf firing was differentiable between parents, and indeed, the different manifestations of the leaf firing trait were not significantly correlated and QTL did not co‐localize. Leaf firing and leaf blotching traits were correlated at some vegetative growth stages, and most QTL did not co‐localize. Quantitative trait loci number and position for traits measured at multiple vegetative stages were generally consistent. There was a single QTL for tassel blasting on chromosome 5. Heat‐induced plant death segregated in B73 × CML103 and a major QTL was detected on chromosome 3, explaining 26.2% of phenotypic variance. Our study indicates that complex genetic mechanisms underlie the heat stress response in maize.

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Section: Discussionsupporting

confidence: 75%

“…The estimated heritability for TSBL was 0.90, similar to the estimate of 0.99 in a set of diverse tropical maize inbred lines (Alam et al, 2017). Tassel blasting is a recognized symptom of heat and drought stress, but studies involving the genetic control of TSBL are few.…”

Section: Discussionsupporting

confidence: 69%

Genetic Mapping of Foliar and Tassel Heat Stress Tolerance in Maize

McNellie

Chen

et al. 2018

Crop Science

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“…In previous studies, various traits: number of filled pods, number of seeds, biological yield, harvest index, % pod setting, and 100-seed weight were considered in understanding the heat tolerance in chickpea (Krishnamurthy et al 2011;Devasirvatham et al 2012;). The trait seed set percentage or fruit set was considered as one of the key traits for determining the heat tolerance in various studies in other crops such as maize, rice and tomato (Sato et al 2006;Jagadish et al 2008;Alam et al 2017). In the present study, several phenological and agronomical traits were considered for heat tolerance under field condition.…”

Section: Introductionmentioning

confidence: 97%

Capturing genetic variability and selection of traits for heat tolerance in a chickpea recombinant inbred line (RIL) population under field conditions

et al. 2018

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Chickpea is the most important pulse crop globally after dry beans. Climate change and increased cropping intensity are forcing chickpea cultivation to relatively higher temperature environments. To assess the genetic variability and identify heat responsive traits, a set of 296 F 8-9 recombinant inbred lines (RILs) of the cross ICC 4567 (heat sensitive) 9 ICC 15614 (heat tolerant) was evaluated under field conditions at ICRISAT, Patancheru, India. The experiment was conducted in an alpha lattice design with three replications during the summer seasons of 2013 and 2014 (heat stress environments, average temperature 35°C and above), and post-rainy season of 2013 (non-stress environment, max. temperature below 30°C). A twofold variation for number of filled pods (FPod), total number of seeds (TS), harvest index (HI), percent pod setting (%PodSet) and grain yield (GY) was observed in the RILs under stress environments compared to non-stress environment. A yield penalty ranging from 22.26% (summer 2013) to 33.30% (summer 2014) was recorded in stress environments. Seed mass measured as 100-seed weight (HSW) was the least affected (6 and 7% reduction) trait, while %PodSet was the most affected (45.86 and 44.31% reduction) trait by high temperatures. Mixed model analysis of variance revealed a high genotypic coefficient of variation (GCV) (23.29-30.22%), phenotypic coefficient of variation (PCV) (25.69-32.44%) along with high heritability (80.89-86.89%) for FPod, TS, %PodSet and GY across the heat stress environments. Correlation studies (r = 0.61-0.97) and principal component analysis (PCA) revealed a strong positive association among the traits GY, FPod, VS and %PodSet under stress environments. Path analysis results showed that TS was the major direct and FPod was the major indirect contributors to GY under heat stress environments. Therefore, the traits that are good indicators of high grain yield under heat stress can be used in indirect selection for developing heat tolerant chickpea cultivars. Moreover, the presence of large genetic variation for heat tolerance in the population Electronic supplementary material The online version of this article (

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“…Nonetheless, new DS tolerant source populations are needed to sustain increased genetic gains for food security [29]. Moreover, in comparison to DS, research on HS tolerance in tropical maize is still at the infant stage [29,30], and more studies are needed to complement these breeding efforts. Therefore, performing phenotypic screens to capture the genetic diversity that exist in extra-early landrace accessions of maize resting idle in germplasm banks under DS, HS and DSHS conditions is a promising strategy to uncover new genetic sources, which when introgressed into breeding stocks could contribute to the broadening of the genetic base and development of 'next generation' maize varieties with enhanced quality and other end-user preferred traits.…”

Section: Introductionmentioning

confidence: 99%

Assessing the Potential of Extra-Early Maturing Landraces for Improving Tolerance to Drought, Heat, and Both Combined Stresses in Maize

et al. 2020

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Maize landrace accessions constitute an invaluable gene pool of unexplored alleles that can be harnessed to mitigate the challenges of the narrowing genetic base, declined genetic gains, and reduced resilience to abiotic stress in modern varieties developed from repeated recycling of few superior breeding lines. The objective of this study was to identify extra-early maize landraces that express tolerance to drought and/or heat stress and maintain high grain yield (GY) with other desirable agronomic/morpho-physiological traits. Field experiments were carried out over two years on 66 extra-early maturing maize landraces and six drought and/or heat-tolerant populations under drought stress (DS), heat stress (HS), combined both stresses (DSHS), and non-stress (NS) conditions as a control. Wide variations were observed across the accessions for measured traits under each stress, demonstrating the existence of substantial natural variation for tolerance to the abiotic stresses in the maize accessions. Performance under DS was predictive of yield potential under DSHS, but tolerance to HS was independent of tolerance to DS and DSHS. The accessions displayed greater tolerance to HS (23% yield loss) relative to DS (49% yield loss) and DSHS (yield loss = 58%). Accessions TZm-1162, TZm-1167, TZm-1472, and TZm-1508 showed particularly good adaptation to the three stresses. These landrace accessions should be further explored to identify the genes underlying their high tolerance and they could be exploited in maize breeding as a resource for broadening the genetic base and increasing the abiotic stress resilience of elite maize varieties.

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Dissecting heat stress tolerance in tropical maize (Zea mays L.)

Cited by 100 publications

References 32 publications

Genetic Mapping of Foliar and Tassel Heat Stress Tolerance in Maize

Genetic Mapping of Foliar and Tassel Heat Stress Tolerance in Maize

Capturing genetic variability and selection of traits for heat tolerance in a chickpea recombinant inbred line (RIL) population under field conditions

Assessing the Potential of Extra-Early Maturing Landraces for Improving Tolerance to Drought, Heat, and Both Combined Stresses in Maize

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