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Maize leaf temperature responses to drought: Thermal imaging and quantitative trait loci (QTL) mapping

文献类型： 外文期刊

作者： Liu, Ya 1 ; Subhash, Chander 1 ; Yan, Jianbin 1 ; Song, Chunpeng 3 ; Zhao, Jiuran 2 ; Li, Jiansheng 1 ;

作者机构： 1.China Agr Univ, Natl Maize Improvement Ctr China, Minist Agr, Key Lab Crop Genom & Genet Improvement, Beijing 100193, Peoples R China

2.Beijing Acad Agr & Forestry Sci, Maize Res Ctr, Beijing 100097, Peoples R China

3.Henan Univ, Dept Biol, Lab Plant Stress Biol, Kaifeng 475001, Peoples R China

关键词： Infrared thermography;Leaf temperature;Drought tolerance;QTL;Maize

期刊名称：ENVIRONMENTAL AND EXPERIMENTAL BOTANY （ 影响因子：5.545； 五年影响因子：5.99 ）

ISSN：

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收录情况： SCI

摘要： Leaf temperature has been shown to vary when plants are subjected to water stress conditions. Recent advances in infrared thermography have increased the probability of recording drought tolerant responses more accurately. The aims of this study were to identify the effects of drought on leaf temperature using infrared thermography. Furthermore, the genomic regions responsible for the expression of leaf temperature variation in maize seedlings (Zea mays L.) were explored. The maize inbred lines Zong3 and 87-1 were evaluated using infrared thermography and exhibited notable differences in leaf temperature response to water stress. Correlation analysis indicated that leaf temperature response to water stress played an integral role in maize biomass accumulation. Additionally, a mapping population of 187 recombinant inbred lines (RILs) derived from a cross between Zong3 and 87-1 was constructed to identify quantitative trait loci (QTL) responsible for physiological traits associated with seedling water stress. Leaf temperature differences (LTD) and the drought tolerance index (DTI) of shoot fresh weight (SFW) and shoot dry weight (SDW) were the traits evaluated for QTL analysis in maize seedlings. A total of nine QTL were detected by composite interval mapping (CIM) for the three traits (LTD, RSFW and RSDW). Two co-locations responsible for both RSFW and RSDW were detected on chromosomes 1 and 2, respectively, which showed common signs with their trait correlations. Another co-location was detected on chromosome 9 between LTD and shoot biomass, which provided genetic evidence that leaf temperature affects biomass accumulation. Additionally, the utility of a thermography system for drought tolerance breeding in maize was discussed.

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