Drought resilience in CIMMYT maize lines adapted to Africa resulting from transpiration sensitivity to vapor pressure deficit and soil drying

IF 1 Q3 AGRONOMY

Journal of Crop Improvement Pub Date : 2021-08-03 DOI:10.1080/15427528.2021.1961334

H. Chiango, N. Jafarikouhini, D. Pradhan, A. Figueirêdo, J. Silva, T. Sinclair, J. Holland

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引用次数: 2

Abstract

ABSTRACT Low rainfall limits crop yield, particularly for maize (Zea mays L.) in southern Africa. Consequently, there is a need to identify genetic sources of specific drought-related traits that can contribute to soil water conservation and increased yields under water-limited conditions. In this study, maize genotypes released for production in southern Africa were tested for expression of two soil water-conservation traits: limited transpiration under elevated vapor pressure deficit (VPD) and decreased transpiration rate at high soil water contents earlier in the soil drying cycle. Two genotypes, CML 590 and CML 593, were identified and confirmed to initiate expression of limited-transpiration rate at VPD above about 1.9 kPa. In the soil-drying experiment, Umbelu 8923 and Umbelu 8930 closed their stomata earliest in the soil drying cycle as compared to other tested genotypes. These four genotypes with specific physiological traits for superior response to water deficit are genetic resources for further study to improve maize drought resilience.

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适应非洲的CIMMYT玉米品系的抗旱能力源于蒸腾对蒸汽压亏缺和土壤干燥的敏感性

摘要低降雨量限制了作物产量，尤其是南部非洲的玉米。因此，有必要确定特定干旱相关性状的遗传来源，这些性状有助于在缺水条件下保持土壤水分和提高产量。在本研究中，对南部非洲生产的玉米基因型进行了两种土壤水分保持性状的表达测试：在土壤干燥周期早期，在高蒸气压亏缺（VPD）下蒸腾作用有限，在高土壤含水量下蒸腾速率降低。两种基因型，CML 590和CML 593，被鉴定并证实在VPD高于约1.9kPa时启动有限蒸腾速率的表达。在土壤干燥实验中，与其他测试基因型相比，Umbelu 8923和Umbelu 8930在土壤干燥周期中最早关闭气孔。这四种具有特殊生理性状的基因型对缺水具有较好的响应能力，是进一步研究提高玉米抗旱性的遗传资源。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Crop Improvement Multiple-

CiteScore

3.30

自引率

7.70%

发文量

期刊介绍： Journal of Crop Science and Biotechnology (JCSB) is a peer-reviewed international journal published four times a year. JCSB publishes novel and advanced original research articles on topics related to the production science of field crops and resource plants, including cropping systems, sustainable agriculture, environmental change, post-harvest management, biodiversity, crop improvement, and recent advances in physiology and molecular biology. Also covered are related subjects in a wide range of sciences such as the ecological and physiological aspects of crop production and genetic, breeding, and biotechnological approaches for crop improvement.