in the Wild Oryza Species

The physiological responses of wild Oryza species (Oryza latifolia Desv., a salt-tolerant species and 0. rufipogon Griff., a salt-susceptible species) to salinity stress were investigated by comparing with check varieties of cultivated rice (0. sativa L.), SR26B (salt-tolerant) and IR28 (salt-susceptible). As the NaCl concentration of water culture solution was raised to 12 dS m~' (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 (NPw) 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 0. latifolia though "

Keywords:

• Oryza
• Salinity
• Oryza latifolia
• Photosynthesis
• Dry matter
• Horticulture
• Osmotic pressure
• Agronomy
• Biology
• leaf blade
• significant negative correlation
• physiological responses
• salinity stress

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