The mechanism underlying fast germination of tomato cultivar LA2711
文献类型: 外文期刊
第一作者: Yang, Rongchao
作者: Yang, Rongchao;Zhang, Haijun;Wang, Jinfang;Li, Dianbo;Guo, Yang-Dong;Chu, Zhuannan;Li, Ying;Ouyang, Bo;Yang, Rongchao;Weeda, Sarah;Ren, Shuxin
作者机构:
关键词: Abscisic acid;Gene expression;Germination;Gibberellins;Salt-tolerant;Tomato
期刊名称:PLANT SCIENCE ( 影响因子:4.729; 五年影响因子:5.132 )
ISSN:
年卷期:
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收录情况: SCI
摘要: Seed germination is important for early plant morphogenesis as well as abiotic stress tolerance, and is mainly controlled by the phytohormones abscisic acid (ABA) and gibberellic acid (GA). Our previous studies identified a salt-tolerant tomato cultivar, LA2711, which is also a fast-germinating genotype, compared to its salt-sensitive counterpart, ZS-5. In an effort to further clarify the mechanism underlying this phenomenon, we compared the dynamic levels of ABA and GA(4), the transcript abundance of genes involved in their biosynthesis and catabolism as well as signal transduction between the two cultivars. In addition, we tested seed germination sensitivity to ABA and GAs. Our results revealed that insensitivity of seed germination to exogenous ABA and low ABA content in seeds are the physiological mechanisms conferring faster germination rates of LA2711 seeds. SICYP707A2, which encodes an ABA catabolic enzyme, may play a decisive role in the fast germination rate of LA2711, as it showed a significantly higher level of expression in LA2711 than ZS-5 at most time points tested during germination. The current results will enable us to gain insight into the mechanism(s) regarding seed germination of tomato and the role of fast germination in stress tolerance. (C) 2015 Elsevier Ireland Ltd. All rights reserved.
分类号: Q94
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