Performance assessment of drought tolerant maize hybrids under combined drought and heat stress
Drought and high temperature are two major factors limiting maize productivity in sub-Saharan Africa. An increase in temperature above 30 °C reduces yield by 1% under optimal rain-fed condition and by 1.7% under drought stress (DS) and up to 40% under combined drought and heat stress (DSHTS). Approaches that improve performance under the two stresses are essential to sustain productivity. The objectives of this study were to (i) assess the extent of variation in tolerance to DSHTS from among the existing best drought tolerant (DT) hybrids; (ii) examine the response patterns of the hybrids to DSHTS; (iii) identify traits that contributed to better performance under DSHTS; and (iv) select the best hybrids with tolerance to DSHTS stress. We evaluated 40 DT hybrids under DSHTS, DS, and well-watered (WW) conditions for three years. Highly significant (p < 0.001) differences were found among hybrids for grain yield and other traits. Moderately to low repeatability values were detected for grain yield under DS (0.63) and under DSHTS (0.48). Grain yield under DS was not correlated with grain yield under DSHTS (r = 0.29; p = 0.06), but it was correlated with grain yield under WW (r = 0.74; p < 0.001). Grain yield was strongly correlated with ears per plant, ear and pant aspects, days to anthesis and silking under both DS and DSHTS. Tassel blast accounted for 28% of the yield reduction under DSHTS. The top five DT hybrids produced 9 to 26% more grain yields than the best commercial hybrid. Three hybrids produced high grain yields under DTHTS and DS as well as under WW. These hybrids will be tested further in collaboration with partners for possible release.
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Format: | Journal Article biblioteca |
Language: | English |
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MDPI
2018
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Subjects: | drought, heat stress, drought tolerance, yields, nigeria, west africa, |
Online Access: | https://hdl.handle.net/10568/98428 https://doi.org/10.3390/agronomy8120274 |
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dig-cgspace-10568-984282023-12-08T19:36:04Z Performance assessment of drought tolerant maize hybrids under combined drought and heat stress Meseka, S. Menkir, A. Bossey, B. Mengesha Abera, W. drought heat stress drought tolerance yields nigeria west africa Drought and high temperature are two major factors limiting maize productivity in sub-Saharan Africa. An increase in temperature above 30 °C reduces yield by 1% under optimal rain-fed condition and by 1.7% under drought stress (DS) and up to 40% under combined drought and heat stress (DSHTS). Approaches that improve performance under the two stresses are essential to sustain productivity. The objectives of this study were to (i) assess the extent of variation in tolerance to DSHTS from among the existing best drought tolerant (DT) hybrids; (ii) examine the response patterns of the hybrids to DSHTS; (iii) identify traits that contributed to better performance under DSHTS; and (iv) select the best hybrids with tolerance to DSHTS stress. We evaluated 40 DT hybrids under DSHTS, DS, and well-watered (WW) conditions for three years. Highly significant (p < 0.001) differences were found among hybrids for grain yield and other traits. Moderately to low repeatability values were detected for grain yield under DS (0.63) and under DSHTS (0.48). Grain yield under DS was not correlated with grain yield under DSHTS (r = 0.29; p = 0.06), but it was correlated with grain yield under WW (r = 0.74; p < 0.001). Grain yield was strongly correlated with ears per plant, ear and pant aspects, days to anthesis and silking under both DS and DSHTS. Tassel blast accounted for 28% of the yield reduction under DSHTS. The top five DT hybrids produced 9 to 26% more grain yields than the best commercial hybrid. Three hybrids produced high grain yields under DTHTS and DS as well as under WW. These hybrids will be tested further in collaboration with partners for possible release. 2018 2018-12-04T11:41:09Z 2018-12-04T11:41:09Z Journal Article Meseka, S., Menkir, A., Bossey, B. & Mengesha, W. (2018). Performance assessment of drought tolerant maize hybrids under combined drought and heat stress. Agronomy, 8(12), 274. 2073-4395 https://hdl.handle.net/10568/98428 https://doi.org/10.3390/agronomy8120274 BIOTECH & PLANT BREEDING en CC-BY-4.0 Open Access 1-17 application/pdf MDPI Agronomy |
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drought heat stress drought tolerance yields nigeria west africa drought heat stress drought tolerance yields nigeria west africa Meseka, S. Menkir, A. Bossey, B. Mengesha Abera, W. Performance assessment of drought tolerant maize hybrids under combined drought and heat stress |
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Drought and high temperature are two major factors limiting maize productivity in sub-Saharan Africa. An increase in temperature above 30 °C reduces yield by 1% under optimal rain-fed condition and by 1.7% under drought stress (DS) and up to 40% under combined drought and heat stress (DSHTS). Approaches that improve performance under the two stresses are essential to sustain productivity. The objectives of this study were to (i) assess the extent of variation in tolerance to DSHTS from among the existing best drought tolerant (DT) hybrids; (ii) examine the response patterns of the hybrids to DSHTS; (iii) identify traits that contributed to better performance under DSHTS; and (iv) select the best hybrids with tolerance to DSHTS stress. We evaluated 40 DT hybrids under DSHTS, DS, and well-watered (WW) conditions for three years. Highly significant (p < 0.001) differences were found among hybrids for grain yield and other traits. Moderately to low repeatability values were detected for grain yield under DS (0.63) and under DSHTS (0.48). Grain yield under DS was not correlated with grain yield under DSHTS (r = 0.29; p = 0.06), but it was correlated with grain yield under WW (r = 0.74; p < 0.001). Grain yield was strongly correlated with ears per plant, ear and pant aspects, days to anthesis and silking under both DS and DSHTS. Tassel blast accounted for 28% of the yield reduction under DSHTS. The top five DT hybrids produced 9 to 26% more grain yields than the best commercial hybrid. Three hybrids produced high grain yields under DTHTS and DS as well as under WW. These hybrids will be tested further in collaboration with partners for possible release. |
format |
Journal Article |
topic_facet |
drought heat stress drought tolerance yields nigeria west africa |
author |
Meseka, S. Menkir, A. Bossey, B. Mengesha Abera, W. |
author_facet |
Meseka, S. Menkir, A. Bossey, B. Mengesha Abera, W. |
author_sort |
Meseka, S. |
title |
Performance assessment of drought tolerant maize hybrids under combined drought and heat stress |
title_short |
Performance assessment of drought tolerant maize hybrids under combined drought and heat stress |
title_full |
Performance assessment of drought tolerant maize hybrids under combined drought and heat stress |
title_fullStr |
Performance assessment of drought tolerant maize hybrids under combined drought and heat stress |
title_full_unstemmed |
Performance assessment of drought tolerant maize hybrids under combined drought and heat stress |
title_sort |
performance assessment of drought tolerant maize hybrids under combined drought and heat stress |
publisher |
MDPI |
publishDate |
2018 |
url |
https://hdl.handle.net/10568/98428 https://doi.org/10.3390/agronomy8120274 |
work_keys_str_mv |
AT mesekas performanceassessmentofdroughttolerantmaizehybridsundercombineddroughtandheatstress AT menkira performanceassessmentofdroughttolerantmaizehybridsundercombineddroughtandheatstress AT bosseyb performanceassessmentofdroughttolerantmaizehybridsundercombineddroughtandheatstress AT mengeshaaberaw performanceassessmentofdroughttolerantmaizehybridsundercombineddroughtandheatstress |
_version_ |
1787227860143964160 |