Drought responses of foliar metabolites in three maize hybrids differing in water stress tolerance.
Drought responses of foliar metabolites in three maize hybrids differing in water stress tolerance.
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DOI：
10.1371/journal.pone.0077145
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发表时间：
2013
期刊：
影响因子：
3.7
通讯作者：
Sicher RC
中科院分区：
文献类型：
--
作者：
Barnaby JY;Kim M;Bauchan G;Bunce J;Reddy V;Sicher RC
玉米(Zea Mays L.)在受控环境中对耐旱性不同的杂交种进行水分胁迫处理。试验在营养生长期间进行，从播种后第17天开始，保持水分19天。利用测量的叶水势变化进行基因型比较，或通过处理时间来表示结果。在水分充足的情况下，耐旱杂交种最终收获时的干物质总量比中感杂交种少53%。这表明，耐旱性极强的玉米杂交种具有影响土壤水分和叶水势的矮秆表型。与耐旱性中等或敏感玉米杂交种相比，抗旱性较弱的玉米杂交种的地上部和根系生长、叶片水势、净光合作用和气孔导度随水分胁迫处理时间的变化较小。在水分胁迫处理过程中，40种叶片代谢物中有26种存在基因差异。系统聚类法表明，耐性玉米杂交种在较高的叶水势下启动了胁迫相关代谢产物的积累，而不是敏感杂交种或中间杂交种。当玉米叶片中代谢产物的变化在时间上表达时，结果相反。上述结果表明，通过比较不同处理时间或不同叶水势耐旱性不同的玉米杂交种，很容易观察到基因型差异。目前的发现为玉米耐旱性的机制提供了新的和潜在的重要见解。
Maize (Zea mays L.) hybrids varying in drought tolerance were treated with water stress in controlled environments. Experiments were performed during vegetative growth and water was withheld for 19 days beginning 17 days after sowing. Genotypic comparisons used measured changes of leaf water potential or results were expressed by time of treatment. Total dry matter of the drought tolerant hybrid on the final harvest was 53% less than that of the intermediate and susceptible maize hybrids when plants were water sufficient. This showed that maize hybrids selected for extreme drought tolerance possessed a dwarf phenotype that affected soil water contents and leaf water potentials. Changes of shoot and root growth, leaf water potential, net photosynthesis and stomatal conductance in response to the time of water stress treatment were diminished when comparing the drought tolerant to the intermediate or susceptible maize hybrids. Genotypic differences were observed in 26 of 40 total foliar metabolites during water stress treatments. Hierarchical clustering revealed that the tolerant maize hybrid initiated the accumulation of stress related metabolites at higher leaf water potentials than either the susceptible or intermediate hybrids. Opposite results occurred when changes of metabolites in maize leaves were expressed temporally. The above results demonstrated that genotypic differences were readily observed by comparing maize hybrids differing in drought tolerance based on either time of treatment or measured leaf water potential. Current findings provided new and potentially important insights into the mechanisms of drought tolerance in maize.
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影响因子：
3
作者：
Boyer, John S.;James, Richard A.;Passioura, John B.
通讯作者：
Passioura, John B.
影响因子：
4
作者：
Araus JL;Serret MD;Edmeades GO
通讯作者：
Edmeades GO
缺水时的根系生长维持：从生理学到功能基因组学
影响因子：
6.9
作者：
Sharp, RE;Poroyko, V;Nguyen, HT
通讯作者：
Nguyen, HT
影响因子：
64.8
作者：
Pei, ZM;Murata, Y;Schroeder, JI
通讯作者：
Schroeder, JI
影响因子：
5.8
作者：
Campos, H;Cooper, A;Schussler, JR
通讯作者：
Schussler, JR