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Title :Effect of NaCl on the Photosynthesis, Water Relations and Free Proline Accumulation in the Wild Oryza Species
Authors :Nakamura, Ichiro
Murayama, Seiichi
Tobita, Satoshi
Ba Bong, Bui
Yanagihara, Seiji
Ishimine, Yukio
Kawamitsu, Yoshinobu
Issue Date :Dec-2002
Abstract :The physiological responses of wild Oryza species (Oryza latifolia Desv., a salt-tolerant species and O. rufipogon Griff., a salt-susceptible species) to salinity stress were investigated by comparing with check varieties of cultivated rice (O. sativa L.), SR26B (salt-tolerant) and IR28 (salt-susceptible). As the Nacl concentration of water culture solution was raised to 12 dS m^<-1> (about 113mM), leaf Na^+ content per dry matter in wild Oryza species increased from 4 to 17 times as compared with the control (no NaCl treatment), whereas the accumulation was lower in cultivated rice varieties. The increased concentration of leaf Na^+ resulted in the decrease in leaf water potential (Ψ_w) in all rice species, although the degree of decline in photosynthetic rate was different among the varieties. It was notable that the photosynthetic rate was almost constant in O. latifolia though Ψ_w decreased to - 2.0 MPa with the increased NaCl concentration in the water culture solution. A significant negative correlation between free-proline content and osmotic potential (Ψ_s) of leaf blade was found in both salt tolerant entries, SR26B and O. latifolia. In spite of higher leaf Na^+ storage, the survival rate of O. latifolia was higher than that of SR26B, indicating that the mechanism of salt tolerance in O. latifolia may be different from that in SR26B.
Type Local :雑誌掲載論文
ISSN :1343-943X
Publisher :The Crop Science Society of Japan
URI :http://hdl.handle.net/20.500.12000/4870
Citation :Plant Production Science Vol.5 no.4 p.305 -310
Appears in Collections:Peer-reviewed Journal Articles (Faculty of Agriculture)

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