期刊
JOURNAL OF EXPERIMENTAL BOTANY
卷 69, 期 21, 页码 5169-5176出版社
OXFORD UNIV PRESS
DOI: 10.1093/jxb/ery281
关键词
Arabidopsis; cytokinin; hormones; ovule development; pistil development; transcriptional regulation
资金
- Ministry of Education, Youth and Sports of the Czech Republic through the National Program of Sustainability [LO1204]
- Ministero dell'Istruzione, dell'Universita e della Ricerca (MIUR)
- MIUR
Seeds derive from ovules upon fertilization and therefore the total number of ovules determines the final seed yield, a fundamental trait in crop plants. Among the factors that co-ordinate the process of ovule formation, the transcription factors CUP-SHAPED COTYLEDON1 (CUC1) and CUC2 and the hormone cytokinin (CK) have a particularly prominent role. Indeed, the absence of both CUC1 and CUC2 causes a severe reduction in ovule number, a phenotype that can be rescued by CK treatment. In this study, we combined CK quantification with an integrative genome-wide target identification approach to select Arabidopsis genes regulated by CUCs that are also involved in CK metabolism. We focused our attention on the functional characterization of UDP-GLUCOSYL TRANSFERASE 85A3 (UGT85A3) and UGT73C1, which are up-regulated in the absence of CUC1 and CUC2 and encode enzymes able to catalyse CK inactivation by O-glucosylation. Our results demonstrate a role for these UGTs as a link between CUCs and CK homeostasis, and highlight the importance of CUCs and CKs in the determination of seed yield.
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