Meta-analysis of constitutive and adaptive QTL for drought tolerance in maize |
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Authors: | Zhuanfang Hao Xinhai Li Xiulin Liu Chuanxiao Xie Mingshun Li Degui Zhang Shihuang Zhang |
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Institution: | (1) Institute of Crop Science, Chinese Academy of Agricultural Sciences, National Key Facilities for Crop Genetic Resources and Improvement, No. 12 Zhongguancun, South Street, Haidian District, Beijing, 100081, China;(2) International Maize and Wheat Improvement Center (CIMMYT), Apartado, Postal 6-641, Mexico, 06600, DF, Mexico; |
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Abstract: | The response of plants to drought stress is very complex and involves expression of a lot of genes and pathways for diverse
mechanisms and interactions with environments. Many quantitative trait loci(QTL) mapping experiments have given heterogeneous
results due to use of different genotypes and populations tested in various environments. Our purpose was to identify some
important constitutive and adaptive QTL using meta-analysis and to find specific genes and their families for speculating
on drought tolerance networks. A total of 239 QTL detected under water-stressed conditions and 160 detected under control
conditions from 12 populations tested in 22 experiments were compiled and compared, resulting in identification of 39 consensus
QTL under water stress, and 36 under control conditions. Of them, 32 consensus QTL were supposed to be adaptive while others
were constitutive QTL. The consensus QTL on chromosomes 1, 2, 3, 5, 6 and 9 were highly overlapped with several different
traits and could be identified under multiple environments, most of which were related to traits of high phenotypic variance.
Moreover, 48 candidate genes related to stress tolerance were located in silico in these consensus QTL regions what should facilitate the construction of QTL networks and help to understand the mechanisms
related to drought tolerance. |
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