期刊
JOURNAL OF EXPERIMENTAL BOTANY
卷 67, 期 9, 页码 2889-2900出版社
OXFORD UNIV PRESS
DOI: 10.1093/jxb/erw131
关键词
Abscisic acid; gene expression; heterosis; maize; seed germination; ZmABA8ox1b
资金
- National Natural Science Foundation of China [31230054]
- National Basic Research Program of China 973 Program [2012CB910900]
- Innovative Project of SKLAB [2016SKLAB-2]
- 863 Project of China [2012AA10A305]
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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