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Title: Study on the downstream targets of DELLA proteins in Arabidopsis Thaliana
Authors: FANG LEI
Keywords: DELLA proteins, SnRK1, ERF/AP2, low fertility, stress, Arabidopsis
Issue Date: 3-Feb-2010
Citation: FANG LEI (2010-02-03). Study on the downstream targets of DELLA proteins in Arabidopsis Thaliana. ScholarBank@NUS Repository.
Abstract: The phytohormone gibberellin (GA) regulates various processes throughout plant development, ranging from seed germination to floral induction and pollen maturation. DELLA proteins (DELLAs), which confer plant growth restraint, are the key component in the GA signaling pathway and function as repressors for almost all GA-mediated responses. In addition, DELLAs also participate in adaptive plant growth under environmental stresses. Previous microarray experiments identified two genes, AtPV42a and RAP2.6, as potential downstream targets of DELLAs in Arabidopsis. In this study, these two genes were characterized using molecular and genetic approaches. Our results demonstrate that in Arabidopsis, AtPV42a and its closest homologue, AtPV42b, play redundant roles in regulating male gametogenesis and pollen tube guidance, while RAP2.6 is involved not only in ABA- and stress-induced responses during seed germination, but also in the thermosensory pathway of flowering time control. Our findings will help to elucidate the underlying mechanisms of DELLA functions and enrich the knowledge on the GA signaling pathway.
Appears in Collections:Ph.D Theses (Open)

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