Phytochromes.
Pr: 650-670 nm; Pfr: 705-740 nm.
Activated (Pr to Pfr) by:
1) Absorption of red light
Deactivated (Pfr to Pr) by:
1) Absorption of far-red light
2) Some nono-photoinduced reaction, slowly (Li et al., 2011)
3) Warmer temperatures (Halliday & Davis, 2016)
Shade avoidance syndrome (SAS)
Includes:
1) Upward bending of leaf petiole (the
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