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KMID : 0368420050480030326
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Journal of Plant Biology
2005 Volume.48 No. 3 p.326 ~ p.331
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Characterization of photosynthetic events and associated changes in various clones of tea(camellia sinensis l) under low temperature conditions
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Netto L. A.
Jayaram K. M.
Haridas P.
Puthur Jos T.
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Abstract
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Low temperature is one of the major environmental factors determining the growth rate ofCamellia sinensis (L.), and photosynthesis is one major metabolic process commonly used as a tool for identifying low temperature stress effects on plants. The Fv/Fm values at 6:30 a.m. (300-400 umol m-2s-1) did not vary much between the clones of tea plants. Further, when the light incidence increased at mid noon hours (1700-1800 μmol m-2s-1), the Fv/Fm values recorded a decline, irrespective of the clones. Of the 10 clones of tea plants under investigation, 3 clones, namely CRA-6017, TTL-6 and SMP-1, recorded a sharp decrease in the Fv/Fm ratio by 2 p.m. The malondialdehyde (MDA) levels in all the clones increased from 9 a.m. (1500-1700 μmol m-2s-1) to 2 p.m. and from 4:30 p.m. (900-1100 μmol m-2s-1) onwards it started to decrease and reach the levels equivalent to 6:30 a.m. by 7 p.m. (5?10 μmol m-2s-1 ). But the clones of TTL-1, TTL-4 and UPASI-9 showed low temperature tolerance as appeared in chlorophyll a fluorescence response. They showed a higher percentage increase in MDA levels, as compared to TTL-6, CRA-6017 and SMP-1, which showed low temperature susceptibility. But the reduction in the level of MDA by 4:30 p.m. (recovery) was faster in the clones TTL-1, TTL-4 and UPASI-9, as compared to TTL-6, SM/OM/54 and SMP-1. The result indicates that in TTL-6, SMP-1 and SM/ OM/54, the toxic oxygen species scavenging mechanisms may be less functional as compared to other clones. The percentage increase of proline and carotenoids was higher in clones TTL-1, TTL-4 and UPASI-9 as compared to TTL-6, CRA-6017 and SMP-1.
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KEYWORD
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Camellia sinensis, clones, low temperature, photosynthesis
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