Salt tolerance of Oryza latifolia Desv. in relation to photosynthesis under salinity conditions
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Accession number;05A0364413
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| Title;Salt tolerance of Oryza latifolia Desv. in relation to photosynthesis under salinity conditions |
| Author;
NAKAMURA ICHIRO
(Univ. of Ryukyus)
AGARIE SAKAE
(Saga Univ., Fac. Agriculture, JPN)
MURAYAMA SEIICHI
(Univ. of Ryukyus)
TOBITA SATOSHI
(Japan International Res. Center Agricultural Sci., JPN)
YANAGIHARA SEIJI
(Kokusaiineken)
KAWAMITSU YOSHINOBU
(Univ. of Ryukyus)
MOTOMURA KEIJI
(Univ. of Ryukyus)
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Journal Title;Japanese Journal of Tropical Agriculture
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Journal Code:F0874A
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ISSN:0021-5260
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VOL.49;NO.1;PAGE.77-83(2005)
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| Figure&Table&Reference;FIG.1, TBL.5, REF.19 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;To elucidate the factors responsible for salt tolerance in Oryza latifolia Desv., we measured the photosynthetic rate, stomatal conductance, intercellular CO2 concentration (Ci) and CO2 fixation efficiency in the salt-stressed leaves, compared with those of the salt susceptible wild rice species O. rufipogon Griff., salt-tolerant O. sativa cultivar SR26B, and susceptible O. sativa cultivar IR28. In the cultivated species, the photosynthetic rate decreased with the application of NaCl due to the decrease in the CO2 supply rate associated with the stomatal closure and lowering of the Rubisco activity, whereas in the wild rice species, the closure of the stomata was the main factor responsible for the decrease in the photosynthetic rate. Photosynthetic rate without the effects of stomatal closure that was measured with a liquid phase type oxygen electrode was maintained in O. latifolia under the stress conditions, and the superiority was remarkable in terms of leaf senescence. Using this method, the photosynthetic rate of leaves grown under normal conditions was also measured in the reaction buffer containing NaCl at different levels. In O. latifolia, the photosynthetic rate was maintained in the buffer solution containing 655mM NaCl, suggesting that the photosynthetic enzymes and thylakoid membrane of this species display specific characteristics of enhanced resistance to NaCl. (author abst.) |
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