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Analysis of different strategies adapted by two cassava cultivars in response to drought stress: ensuring survival or continuing growth

文献类型： 外文期刊

作者： Zhao, Pingjuan 1 ; Liu, Pei 3 ; Shao, Jiaofang 3 ; Li, Chunqiang 1 ; Wang, Bin 1 ; Guo, Xin 1 ; Yan, Bin 3 ; Xia, Yiji 3 ; P 1 ;

作者机构： 1.Chinese Acad Trop Agr Sci, Inst Trop Biosci & Biotechnol, Haikou, Peoples R China

2.Hainan Univ, Coll Agron, Haikou, Peoples R China

3.Hong Kong Baptist Univ, Dept Biol, Hong Kong, Hong Kong, Peoples R China

4.Minist Agr, Key Lab Biol & Genet Resources Trop Crops, Haikou, Peoples R China

5.Chinese Univ Hong Kong, Partner State Key Lab Agrobiotechnol, Hong Kong, Hong Kong, Peoples R China

关键词： Cassava;cyanogenic glycosides;drought-responsive protein;drought tolerance;proteomics;stress response

期刊名称：JOURNAL OF EXPERIMENTAL BOTANY （ 影响因子：6.992； 五年影响因子：7.86 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Cassava is one of the most drought-tolerant crops, however, the underlying mechanism for its ability to survive and produce under drought remains obscure. In this study, two cassava cultivars, SC124 and Arg7, were treated by gradually reducing the soil water content. Their responses to the drought stress were examined through their morphological and physiological traits and isobaric tags for relative and absolute quantitation (iTRAQ)-based proteomic analysis. SC124 plants adapted a 'survival' mode under mild drought stress as evidenced by early stomatal closure and a reduction in the levels of various photosynthetic proteins and photosynthetic capacity, resulting in early growth quiescence. In contrast, Arg7 plants underwent senescence of older leaves but continued to grow, although at a reduced rate, under mild drought. SC124 plants were more capable of surviving prolonged severe drought than Arg7. The iTRAQ analysis identified over 5000 cassava proteins. Among the drought-responsive proteins identified in the study were an aquaporin, myo-inositol 1-phosphate synthases, and a number of proteins involved in the antioxidant systems and secondary metabolism. Many proteins that might play a role in signalling or gene regulation were also identified as drought-responsive proteins, which included several protein kinases, two 14-3-3 proteins, several RNA-binding proteins and transcription factors, and two histone deacetylases. Our study also supports the notion that linamarin might play a role in nitrogen reallocation in cassava under drought.

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