STUNTEDmediates the control of cell proliferation by GA inArabidopsis

We present evidence that STU serves as an important regulator mediating the control of cell proliferation by GA possibly through two cyclin-dependent kinase inhibitors, SIM and SIAMESE-RELATED 1

Li Yen Candy Lee; Xingliang Hou; Lei Fang; Shuguo Fan; Prakash P. Kumar; Hao Yu

2012

Scholarcy highlights

  • Plants show massive variations in stature and genes involved in the control of plant architecture have been recently categorized into three classes, those affecting hormone metabolism and signaling, transcription and other regulatory factors, and cell cycle regulators
  • We report the characterization of a receptor-like cytoplasmic kinase VI family protein, STUNTED, which was earlier designated as RLCK VI_B4
  • Plant material and growth conditions Arabidopsis thaliana plants were grown under long days at 22°C. stu-1 and sim-1 are in Columbia background, whereas all the other genetic materials used in this study are in Landsberg erecta background. stu-1 was created through backcrossing stu1 to Ler three times
  • We examined the response of STU expression to GA treatment in wild-type and ga1-3 seedlings, and found that STU transcript levels were significantly upregulated by GA in ga1-3. This suggests that GA treatment, which stimulates the degradation of DELLA proteins, promotes STU expression
  • In Ler wild-type plants, GA treatment reduced the expression of SIAMESE-RELATED 1 and SIM, which is consistent with the previously published data, indicating that both genes are regulated in the GA pathway
  • STU encodes an RLCK that functions in maintaining normal plant stature In this study, we characterized the biological function of STU, an RLCK VI family protein, in Arabidopsis
  • Our results suggest that STU acts downstream of RGA and promotes cell proliferation in the GA pathway

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