Relationship between Na content or K/Na ratio in shoots and salt tolerance in several gramineous plants
1999
Kim, Y.H. (Tsukuba Univ., Ibaraki (Japan)) | Shim, I.S. | Kobayashi, K. | Usui, K.
The relationship between Na content or K/Na ratio and the salt tolerance was investigated in several gramineous plants. Growth inhibition by NaCl treatment was greater in shoots than in roots and less in Echinochloa oryzicola Vasing (Tsukuba) than in rice (Nipponbare). Na content of roots in E. oryzicola seedlings was higher than that of leaves, whereas it was the reverse in rice seedlings under a saline condition. Rice (Nipponbare) contained more Na in their leaves than E. oryzicola (Tsukuba). These suggest that E. oryzicola might reduce the transport of Na to shoot more effectively than rice. The decrease of K uptake and the increase of Na uptake by NaCl treatment resulted in lower K/Na ratio in leaves and roots. This trend was greater in rice than E. oryzicola. Moreover, this relationship between Na content or K/Na ratio and salt tolerance was also observed in 8 gramineous species examined. Among them, foxtail and corn were comparatively salt-tolerant, and contained higher Na concentration and lower K/Na ratio in shoots, suggesting that these 2 species possess a different salt tolerance mechanism. It was suggested that the salt tolerance of the gramineous species examined in this study might be related to their different abilities in limiting Na uptake and its transport to shoot and maintaining K in shoot under a saline condition
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