Photosynthesis and the Enzymes of Photosynthetic Carbon Reduction Cycle in Mulberry During Water Stress and Recovery |
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Authors: | Thimmanaik S Kumar S Giridara Kumari G Jyothsna Suryanarayana N Sudhakar C |
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Institution: | (1) Regional Sericultural Research Station, CSB, P. Box No.50, Anantapur, 515 001, India;(2) Department of Botany, Sri Krishnadevaraya University, Anantapur, 515 003, India |
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Abstract: | Net photosynthetic rate (P
N), stomatal conductance (g
S), transpiration rate (E), intercellular CO2 concentration (C
i), leaf water potential ( w), leaf area, chlorophyll (Chl) content, and the activities of photosynthetic carbon reduction cycle (PCR) enzymes in two mulberry (Morus alba L.) cultivars (drought tolerant Anantha and drought sensitive M-5) were studied during water stress and recovery. During water stress, P
N, g
S, and E declined whereas C
i increased. P
N, g
S, and E were less affected in Anantha than in M-5, which indicates tolerance nature of Anantha over M-5. Activities of ribulose-5-phosphate kinase, NAD- and NADP-glyceraldehyde-3-phosphate dehydrogenases, and 3-phosphoglycerate kinase decreased with increasing stress in both the cultivars. The enzyme activities less affected in tolerant (Anantha) than in sensitive cultivar (M-5) were restored after re-watering to almost initial values in both the cultivars. Re-watering of the plants led to an almost complete recovery of P
N, E, and g
S, indicating that a short-term stress brings about reversible effect in these two cultivars of mulberry. |
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Keywords: | chlorophyll content intercellular CO2 concentration leaf area Morus alba net photosynthetic rate PCR cycle enzymes water use efficiency |
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