Moreover, CbPHYB conferred stronger responses to both light-limited and warm conditions in the phyB-deficient mutant of Arabidopsis thaliana than CnPHYB: that is Pfr CbphyB was more stable in nuclei than CnphyB. The higher latitude species ( Cardamine bellidifolia Cb) responded more strongly to light-limited conditions compared with its lower latitude sister ( C. nipponica Cn).We show evolutionary divergence in physiological responses relevant to thermal stability of a physiologically active form of phytochrome (Pfr) between two sister species of Brassicaceae growing at different latitudes.Despite evidence for adaptive importance of natural variation in phytochromes, little information is known about molecular mechanisms that modulate physiological responses of phytochromes in nature. ![]() Phytochromes play a central role in mediating adaptive responses to light and temperature throughout plant life cycles.
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