Gibberellins (GAs), a class of phytohormones, act as an essential natural regulator of plant growth and development. Many studies have shown that GA is related to rhizobial infection and nodule organogenesis in legume species. However, thus far, GA metabolism and signaling components are largely unknown in the model legume . In this study, a genome-wide analysis of GA metabolism and signaling genes was carried out. In total 29 components, including 8 genes, 2 genes, 13 genes, 3 genes, and 3 genes were identified in genome. Expression profiles revealed that most members of , , and showed tissue-specific expression patterns. In addition, the GA biosynthesis and deactivation genes displayed a feedback regulation on GA treatment, respectively. Yeast two-hybrid assays showed that all the three MtGID1s interacted with MtDELLA1 and MtDELLA2, suggesting that the MtGID1s are functional GA receptors. More importantly, exhibited increased plant height and biomass by ectopic expression of the , suggesting that enhanced GA response has the potential for forage improvement.
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| http://dx.doi.org/10.3390/ijms21197180 | DOI Listing |
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