期刊
JOURNAL OF EXPERIMENTAL BOTANY
卷 63, 期 12, 页码 4527-4538出版社
OXFORD UNIV PRESS
DOI: 10.1093/jxb/ers131
关键词
Antagonistic interaction; auxin accumulation; ethylene signalling; hps4 mutant; HPS4; SABRE; phosphate starvation responses
资金
- National Natural Science Foundation of China [31170238]
- Ministry of Science and Technology of China [2009CB119100]
- Ministry of Agriculture of China [2009ZX08009-123B]
The phytohormone ethylene plays important roles in regulating plant responses to phosphate (Pi) starvation. To date, however, no molecular components have been identified that interact with ethylene signalling in regulating such responses. In this work, an Arabidopsis mutant, hps4, was characterized that exhibits enhanced responses to Pi starvation, including increased inhibition of primary root growth, enhanced expression of Pi starvation-induced genes, and overproduction of root-associated acid phosphatases. Molecular cloning indicated that hps4 is a new allele of SABRE, which was previously identified as an important regulator of cell expansion in Arabidopsis. HPS4/SABRE antagonistically interacts with ethylene signalling to regulate plant responses to Pi starvation. Furthermore, it is shown that Pi-starved hps4 mutants accumulate more auxin in their root tips than the wild type, which may explain the increased inhibition of their primary root growth when grown under Pi deficiency.
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