Boron (B) deficiency is prevalent in the soils of tea growing regions of India. In order to investigate the physico-chemical alterations associated with B deficiency in tea ((Camellia sinensis (L.) O. Kuntze, cv. T-78) plants, young plantlets were treated with boric acid (H3BO3) at 0, 2.5, and 5 μM for 8 weeks. B-scarcity decreased the photosynthetic rate (P n), stomatal conductance (g s), and transpiration (E) alongside chlorophyll a (Chl a), chlorophyll b (Chl b), and carotenoids (Car). Superoxide anion (O 2 ·− ), malondialdehyde (MDA), hydrogen peroxide (H2O2) generation and electrolyte leakage were elevated in B-deprived plants. The activities of ascorbate peroxidase (APX; EC 22.214.171.124), catalase (CAT; EC 126.96.36.199), peroxidase (POD; EC 188.8.131.52), and superoxide dismutase (SOD; EC 184.108.40.206) were increased in B-deficient plants. Simultaneously, transcripts of the antioxidant enzymes were up-regulated under B deficiency. By and large, the results suggest that B deficiency intensifies ROS generation but the antioxidant system does not provide for an adequate protection from oxidative damage.
Russian Journal of Plant Physiology – Springer Journals
Published: Aug 14, 2013