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Phytochrome-interacting factor-like protein OsPIL15 integrates light and gravitropism to regulate tiller angle in rice
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Phytochrome-interacting factor-like protein OsPIL15 integrates light and gravitropism to regulate tiller angle in rice
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Journal Article
Phytochrome-interacting factor-like protein OsPIL15 integrates light and gravitropism to regulate tiller angle in rice
2019
Overview
Tiller angle of cereal crops is a key agronomic trait that contributes to grain production. An understanding of how tiller angle is controlled is helpful for achieving ideal plant architecture to improve grain yield. Phytochrome-interacting factors (PIFs) are known to regulate seed germination, seedling skotomorphogenesis, shade avoidance, and flowering in Arabidopsis thaliana. Here, we report that OsPIL15 is, indeed, a rice PIF that negatively regulates tiller angle. Dominant-negative OsPIL15 plants displayed a larger tiller angle, which was associated with reduced shoot gravitropism. Phytochrome B (phyB) is the main photoreceptor perceiving the low red:far-red ratio of shade light. Compared with wild-type rice plants, loss-offunction phyB plants and OsPIL15-overexpressing plants showed smaller tiller angles and enhanced shoot gravitropism. In addition, more OsPIL15 protein accumulated in phyB plants than in wild-type plants. Light regulates the level of the OsPIL15 protein negatively, depending on phyB partially. We propose that OsPIL15 integrates light and gravity signals to regulate tiller angle in rice.
Publisher
Springer Science + Business Media,Springer Berlin Heidelberg,Springer Nature B.V
Subject
/ Agronomy
/ Biomedical and Life Sciences
/ Ecology
/ Forestry
/ Gene Expression Regulation, Plant
/ Grain
/ Gravitropism - radiation effects
/ Gravity
/ Light
/ Oryza
/ Oryza - growth & development
/ Plant Shoots - growth & development
/ Plant Shoots - radiation effects
/ Proteins
/ Rice
/ Seedlings - growth & development
/ Seedlings - radiation effects
/ Shade
