Journal
JOURNAL OF CELL SCIENCE
Volume 128, Issue 21, Pages 3922-3932Publisher
COMPANY OF BIOLOGISTS LTD
DOI: 10.1242/jcs.171207
Keywords
Auxin response factor 2; ARF2; AINTEGUMENTA; ANT; COLD-REGULATED15A; COR15A; Seed mass; Drought tolerance; ABA signal
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Funding
- National Key Basic Research Program of China [2014CB954100]
- National Key Technology RD Program [2015BAD15B02]
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Seedlings of large-seeded plants are considered to be able to withstand abiotic stresses efficiently. Themolecular mechanisms that underlie the involved signaling crosstalk between the large-seeded trait and abiotic tolerance are, however, largely unknown. Here, we demonstrate the molecular link that integrates plant abscisic acid (ABA) responses to drought stress into the regulation of seed mass. Both loss-of-function mutants of the Auxin Response Factor 2 (ARF2 encoding a transcription factor) and lines overexpressing AINTEGUMENTA (ANT; a transcription factor) under the 35S promoter exhibited large seed and drought-tolerant phenotypes as a result of abnormal ABA-auxin crosstalk signaling pathways in Arabidopsis. The target gene COLD-REGULATED15A (COR15a) was identified as participating in the regulation of seed development with ABA signaling through a negative regulation mechanism that is mediated by ANT. Themolecular and genetic evidence presented indicate that ARF2, ANT and COR15A form an ABA-mediated signaling pathway to link modulation of seed mass with drought tolerance. These observations indicate that the ARF2 transcription factor serves as a molecular link that integrates plant ABA responses to drought stress into the regulation of seed mass.
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