Open AccessUp-regulating the abscisic acid inactivation geneZmABA8ox1bcontributes to seed germination heterosis by promoting cell expansion
Author(s) -
Yangyang Li,
Cheng Wang,
Xinye Liu,
Song Jian,
Hongjian Li,
Zhipeng Sui,
Ming Zhang,
Shuang Fang,
Jinfang Chu,
Mingming Xin,
Chaojie Xie,
Yirong Zhang,
Qixin Sun,
Zhongfu Ni
Publication year - 2016
Publication title -
journal of experimental botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.616
H-Index - 242
eISSN - 1460-2431
pISSN - 0022-0957
DOI - 10.1093/jxb/erw131
Subject(s) - abscisic acid , germination , heterosis , gene , biology , microbiology and biotechnology , botany , genetics , hybrid
Heterosis has been widely used in agriculture, but the underlying molecular principles are still largely unknown. During seed germination, we observed that maize (Zea mays) hybrid B73/Mo17 was less sensitive than its parental inbred lines to exogenous abscisic acid (ABA), and endogenous ABA content in hybrid embryos decreased more rapidly than in the parental inbred lines. ZmABA8ox1b, an ABA inactivation gene, was consistently more highly up-regulated in hybrid B73/Mo17 than in its parental inbred lines at early stages of seed germination. Moreover, ectopic expression of ZmABA8ox1b obviously promoted seed germination in Arabidopsis Remarkably, microscopic observation revealed that cell expansion played a major role in the ABA-mediated maize seed germination heterosis, which could be attributed to the altered expression of cell wall-related genes.
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