Photosynthetica 2003, 41(4):579-582 | DOI: 10.1023/B:PHOT.0000027523.51145.a0

Photoassimilatory and Photorespiratory Behaviour of Certain Drought Tolerant and Susceptible Tea Clones

P.R. Jeyaramraja1, R. Raj Kumar1,*, P.K. Pius1, Jibu Thomas1
1 Plant Physiology Division, UPASI Tea Research Foundation, Tea Research Institute, India

Net photosynthetic rate (PN) in the mother leaves was higher in the drought tolerant (DT) clones of tea (Camellia sinensis) while liberation of the fixed 14C in light from the mother leaves was higher in the drought susceptible (DS) clones. The DT clones translocated more photosynthates to the crop shoots (three leaves and a bud) from the mother leaf than the DS clones. Concentrations of RuBP carboxylase (RuBPC) or oxygenase (RuBPO) had no relationship with the drought tolerant nature of tea clones but their ratio correlated with the same. DT tea clones had higher catalase activity that could scavenge the hydrogen peroxide formed in the photorespiratory pathway and thereby reduced photorespiration rate (PR). The ratio of RuBPC/RuBPO had a positive correlation with PN and catalase activity. Negative correlation between RuBPC/RuBPO and PR and between catalase activity and RuBPO activity was established.

Additional key words: Camellia sinensis; catalase; net photosynthetic rate; photorespiration; RuBPC; RuBPO; translocation

Published: December 1, 2003  Show citation

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Jeyaramraja, P.R., Raj Kumar, R., Pius, P.K., & Thomas, J. (2003). Photoassimilatory and Photorespiratory Behaviour of Certain Drought Tolerant and Susceptible Tea Clones. Photosynthetica, 41(4), 579-582. doi: 10.1023/B:PHOT.0000027523.51145.a0
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