Abstract:
:The mechanisms for plant growth restriction during stress conditions remains unclear. Here, we demonstrate that a phytochrome-interacting factor-like protein, OsPIL1/OsPIL13, acts as a key regulator of reduced internode elongation in rice under drought conditions. The level of OsPIL1 mRNA in rice seedlings grown under nonstressed conditions with light/dark cycles oscillated in a circadian manner with peaks in the middle of the light period. Under drought stress conditions, OsPIL1 expression was inhibited during the light period. We found that OsPIL1 was highly expressed in the node portions of the stem using promoter-glucuronidase analysis. Overexpression of OsPIL1 in transgenic rice plants promoted internode elongation. In contrast, transgenic rice plants with a chimeric repressor resulted in short internode sections. Alteration of internode cell size was observed in OsPIL1 transgenic plants, indicating that differences in cell size cause the change in internode length. Oligoarray analysis revealed OsPIL1 downstream genes, which were enriched for cell wall-related genes responsible for cell elongation. These data suggest that OsPIL1 functions as a key regulatory factor of reduced plant height via cell wall-related genes in response to drought stress. This regulatory system may be important for morphological stress adaptation in rice under drought conditions.
journal_name
Proc Natl Acad Sci U S Aauthors
Todaka D,Nakashima K,Maruyama K,Kidokoro S,Osakabe Y,Ito Y,Matsukura S,Fujita Y,Yoshiwara K,Ohme-Takagi M,Kojima M,Sakakibara H,Shinozaki K,Yamaguchi-Shinozaki Kdoi
10.1073/pnas.1207324109subject
Has Abstractpub_date
2012-09-25 00:00:00pages
15947-52issue
39eissn
0027-8424issn
1091-6490pii
1207324109journal_volume
109pub_type
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