Premium
Interaction of phytochromes A and B in the control of de‐etiolation and flowering in pea
Author(s) -
Weller James L.,
Beauchamp Nicola,
Kerckhoffs L. Huub J.,
Platten J. Damien,
Reid James B.
Publication year - 2001
Publication title -
the plant journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.058
H-Index - 269
eISSN - 1365-313X
pISSN - 0960-7412
DOI - 10.1046/j.1365-313x.2001.01027.x
Subject(s) - etiolation , phytochrome , phytochrome a , biology , mutant , seedling , microbiology and biotechnology , botany , genetics , arabidopsis thaliana , biochemistry , gene , red light , enzyme
Summary The interactions of phytochrome A (phyA) and phytochrome B (phyB) in the photocontrol of vegetative and reproductive development in pea have been investigated using null mutants for each phytochrome. White‐light‐grown phyA phyB double mutant plants show severely impaired de‐etiolation both at the seedling stage and later in development, with a reduced rate of leaf production and swollen, twisted internodes, and enlarged cells in all stem tissues. PhyA and phyB act in a highly redundant manner to control de‐etiolation under continuous, high‐irradiance red light. The phyA phyB double mutant shows no significant residual phytochrome responses for either de‐etiolation or shade‐avoidance, but undergoes partial de‐etiolation in blue light. PhyB is shown to inhibit flowering under both long and short photoperiods and this inhibition is required for expression of the promotive effect of phyA. PhyA is solely responsible for the promotion of flowering by night‐breaks with white light, whereas phyB appears to play a major role in detection of light quality in end‐of‐day light treatments, night breaks and day extensions. Finally, the inhibitory effect of phyB is not graft‐transmissible, suggesting that phyB acts in a different manner and after phyA in the control of flower induction.