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Study of Salinity Tolerance Related to Endogenous
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Saied Saiedipour *   |
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Abstract: (4421 Views) |
| Rice (Oryza sativa), a salt-sensitive species, has considerable genetic variation for salt tolerance within the cultivated gene pool. To evaluate salinity effects on Na, K and ABA concentration and dry matter of shoot and root, two rice genotypes (IR29 and IR651, sensitive and tolerant respectively identified by IRRI) were grown in a green house experiment, in normal conditions till 6th leaf was fully expanded. Seedlings were exposed to salinity, EC 12 dS m-1 and normal conditions (EC = 1.65 dSm-1, Ushida solution base EC) for one week. Samples were taken 0, 4, 12, 24, 48, 96, 168 hrs after starting the treatments for determining ABA concentration in the youngest leaf .In another experiment after four hrs of inserting the treatment of salinity, fluridone in 50µM was sprayed only once on leaves, then we used the youngest leaf for measuring Na , K concentration. In this experiment dry matter of root and shoot under salinity in contrast to normal treatment decreased significantly, but this decrease was more in sensitive cultivar. Variation of K was not significant under salinity and salinity cause to accumulate Na in fluridone treatment in a couple of cultivars, but Na concentration in tolerant cultivar was less than half in sensitive cultivar. ABA concentration increased significantly under salinity in tolerant cultivar, however, in sensitive cultivar increase was not significant. |
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| Keywords: Rice, Salinity, Dry matter, ABA, Fluridone. |
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Full-Text [PDF 233 kb]
(1385 Downloads)
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Type of Study: Research |
Subject:
Crop Physiology
Received: 2014/05/18 | Accepted: 2014/05/18 | Published: 2014/05/18
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