Abstract
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 1.11.1.11), catalase (CAT; EC 1.11.1.6), peroxidase (POD; EC 1.11.1.7), and superoxide dismutase (SOD; EC 1.15.1.1) 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.
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Abbreviations
- APX:
-
ascorbate peroxidase
- CAT:
-
catalase
- Chl:
-
chlorophyll
- Car:
-
carotenoids
- E :
-
the rate of transpiration
- EST:
-
expressed sequence tag
- g s :
-
stomatal conductance
- NCBI:
-
National Center for Biotechnology Information
- P n :
-
photosynthetic rate
- POD:
-
peroxidase
- RG:
-
II-rhamnogalacturonan II
- RT-PCR:
-
reverse transcriptase-polymerase chain reaction
- SOD:
-
superoxide dismutase
- TEM:
-
transmission electron microscope
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Mukhopadhyay, M., Ghosh, P.D. & Mondal, T.K. Effect of boron deficiency on photosynthesis and antioxidant responses of young tea plantlets. Russ J Plant Physiol 60, 633–639 (2013). https://doi.org/10.1134/S1021443713030096
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DOI: https://doi.org/10.1134/S1021443713030096