Regulating K+ and Na+ in two rice varieties grown in sodic soils [India]
1986
Qadar, A. (Central Soil Salinity Research Inst., Karnal 132001, Haryana (India). Div. of Genetics and Plant Physiology)
Damodar is more salt tolerant than Jaya and regulated Na+ and K+ better. K+ content of each Damodar lanuna decreased less than in Jaya. Reduction in the first lamina over the respective controls was 43% for Damodar and 51% for Jaya. Thus, each part of Damodar had lower Na+ to K+ ratio than that of Jaya. Analysis 60 d after transplanting showed that each leaf sheath had higher Na+ content than its lamina in both genotypes. The same was true for K+ for the first and second leaf sheaths at pH 8.1. At pH 9.5 however, each lamina had higher K+ than its sheath. In both varieties, sodicity decreased K+ content and increased Na+. Higher Na+ in older laminae seems to occur because of its poor retranslocation from older to younger parts. K+ depletion was highest in older plant parts, suggesting that export of K+ from older to younger parts exceeded its import under stress
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