期刊
PLANT SIGNALING & BEHAVIOR
卷 9, 期 3, 页码 -出版社
TAYLOR & FRANCIS INC
DOI: 10.4161/psb.28013
关键词
anthocyanin; cold; nitrogen; nutrient limitation; phosphate; phytochrome
资金
- National Science Foundation [MCB-0919100]
A biotic stress and light induce anthocyanin accumulation in Arabidopsis. Here, we demonstrate that mesophyll-localized phytochromes regulate nitrogen-, phosphate-and cold-induced anthocyanin accumulation in shoots of Arabidopsis. Whereas ecotype-dependent differences result in distinct total levels of anthocyanin accumulation in response to light, cold, or nutrient-deficient treatments, phytochromes generally gate light-and/or stress-induced anthocyanin accumulation in shoots, as plants depleted of mesophyll-localized phytochromes lack or have highly attenuated induction of anthocyanins. Observed interactions between light and stress were found to be wavelength dependent, with red and far-red light stimulating higher total levels of anthocyanin accumulation under cold temperatures, especially in response to nitrogen limitation, whereas blue light did not. The roots of plants depleted of mesophyll-localized phytochromes still respond to nutrient deficiency as determined by elongation of primary roots and root hair elongation when plants are grown under nitrogen-or phosphate-limited conditions. Plants which are constitutively deficient in photoreceptors in both shoots and roots, i.e., phy or cry mutants, exhibit defects in light-and stress-induced anthocyanin accumulation and defects in root development. Taken together, these results suggest that the response to nutrient limitation in roots and shoots is under distinct control by spatial-specific pools of phytochromes in Arabidopsis.
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