Mechanism of Salt Tolerance in Rice  

作　　者：N.HUSSAIN A.ALI G.SARWAR F.MUJEEB M.TAHIR 

机构地区：[1]Soil Salinity Research Institute,Pindi Bhattian,Punjab(Pakistan),National Agriculture Research Center,Islamabad(Pakistan),Soil Salinity Research Institute,Pindi Bhattian,Punjab(Pakistan),Soil Salinity Research Institute,Pindi Bhattian,Punjab(Pakistan),UNDP-AusAIT-Govt.of Pakistan,Biosaline Community Project,Pindi Bhattian(Pakistan)

出　　处：《Pedosphere》2003年第3期233-238,共6页土壤圈（英文版）

摘　　要：Shaheen Basma ti was evolved as a salt tolerant fine rice va riety by the Soil Salinity Research Institute,Pindi Bhattian, Pakistan. Water culture studies were conducted to investigate the physiological mechanismexercised by this variety in particular and rice plant in general to face the saline environment. Performanceof this rice variety and the concentration and uptake of ions were studied under stress of three salinity levels(30, 60 and 90 mmol L-1) created with NaCl. Recorded data indicated that shoot dry matter was notsignificantly affected by all the three levels of salinity. However, NaCl levels of 60 and 90 mmol L-1 affectedthe root dry matter significantly. Sodium concentration and uptake was enhanced significantly in root andshoot at the first level of salinity (30 mmol L-1) but thereafter the differences were non-significant, indicatingthe preferential absorption of this cation. The K concentration decreased significantly in shoots at all thelevels. The impact was less pronounced in roots as far as K absorption was concerned. The effect on Ca andMg concentrations was not significant. The values of K:Na, Ca:Na and (Ca+Mg):Na ratios in shoot and rootwere comparatively low under stress conditions, indicating that selective ion absorption may be the principalsalt tolerance mechanism of variety Shaheen Basmati when grown in a saline medium.Shaheen Basmati was evolved as a salt tolerant fine rice variety by the SoilSalinity Research Institute, Pindi Bhattian, Pakistan. Water culture studies were conducted toinvestigate the physiological mechanism exercised by this variety in particular and rice plant ingeneral to face the saline environment. Performance of this rice variety and the concentration anduptake of ions were studied under stress of three salinity levels (30, 60 and 90 mmol L^(-1))created with NaCl. Recorded data indicated that shoot dry matter was not significantly affected byall the three levels of salinity. However, NaCl levels of 60 and 90 mmol L^(-1) affected the rootdry matter significantly. Sodium concentration and uptake was enhanced significantly in root andshoot at the first level of salinity (30 mmol L^(-1)) but thereafter the differences werenon-significant, indicating the preferential absorption of this cation. The K concentrationdecreased significantly in shoots at all the levels. The impact was less pronounced in roots as faras K absorption was concerned. The effect on Ca and Mg concentrations was not significant. Thevalues of K:Na, Ca:Na and (Ca+Mg):Na ratios in shoot and root were comparatively low under stressconditions, indicating that selective ion absorption may be the principal salt tolerance mechanismof variety Shaheen Basmati when grown in a saline medium.

关 键 词：dry matter rice variety SALINITY salt tolerance mechanism selective ionabsorption 

分 类 号：S511.01[农业科学—作物学]