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Direct and indirect roles of vitamin B 6  in leaf acclimation to supplementary UV-B radiation are shown in vitamin B 6  deficient  Arabidopsis thaliana  mutant  rsr4-1  and C24 wild type. Responses to 4 days of 3.9 kJ m −2  d −1  biologically effective UV-B dose were compared in terms of leaf photochemistry, vitamer content, and antioxidant enzyme activities; complemented with a comprehensive study of vitamer ROS scavenging capacities. Under UV-B,  rsr4-1  leaves lost more (34%) photochemical yield than C24 plants (24%). In the absence of UV-B,  rsr4-1  leaves contained markedly less pyridoxal-5′-phosphate (PLP) than C24 ones, but levels increased up to the C24 contents in response to UV-B. Activities of class-III ascorbate and glutathione peroxidases increased in C24 leaves upon the UV-B treatment but not in the  rsr4-1  mutant. SOD activities remained the same in C24 but decreased by more than 50% in  rsr4-1  under UV-B. Although PLP was shown to be an excellent antioxidant  in vitro , our results suggest that the UV-B protective role of B 6  vitamers is realized indirectly, via supporting peroxidase defence rather than by direct ROS scavenging. We hypothesize that the two defence pathways are linked through the PLP-dependent biosynthesis of cystein and heme, affecting peroxidases.

Multiple roles for Vitamin B6 in plant acclimation to UV-B