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KMID : 0368420030460010017
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Journal of Plant Biology
2003 Volume.46 No. 1 p.17 ~ p.22
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Differences in Photosynthetic Characterization of Salt Tolerance far Two Rice (Oryza sativa) Cultivars
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Oh, Mi Jin
Chun, Hyun Sik/Lee, Chin Bum
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Abstract
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We photosynthetically characterized two rice cultivars - salt - sensitive ´Annapuma´, and salt-tolerant ´Dongju´-growing under NaCl stress. Both cultivars showed an increase in F_0/F_m (the ratio of initial to maximal cholorophyll fluorescence) and a decreasa in F_v/F_m(an indicator of the photochemical efficiency of PS II). In particular, the F_v value for Annapurna significant declined while F_0/F_m was enhansed when plants were exposed to salt stress for 4 d. Annapurna also exhibited more rapid decreases in the coefficients for photochemical quenching (qQ) and non-pho-tochemical quenching (qNP) than did Dongjin. In contrast, zeacanthin formation was largely influenced by exposure to light rather than to high salinity, with Annapurna having a higher rate of production compared with Dongjin. When both cultivars were exposed to salt stress for 2 d, Annapurna and a much lower rate of photosynthetic oxygen evolution, corresponding to only 46% of the control; the rate for Dongjin was 90% of the control. Salt stress in both cultivars induced the accumulation of two osmoprotectants, glycinebetaine and proline, the rate being higher foe the latter. These results indicate that Annapurna is more sensitive than Dongjin to salt stress, in terms of its deterioration in photosynthtic function.
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