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Physiological Response to Salinity and Alkalinity of Rice Genotypes of Varying Salt Tolerance Grown in Field Lysimeters

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Relation http://oar.icrisat.org/7388/
 
Title Physiological Response to Salinity and Alkalinity of Rice Genotypes of Varying Salt Tolerance Grown in Field Lysimeters
 
Creator Surekha Rao, P
Mishra, B
Gupta, B
Rathore, A
 
Subject Genetics and Genomics
 
Description Soil salinity and alkalinity seriously threaten rice production in south Asia. Improving screening
methodologies to identify sources of tolerance for improved breeding for salt tolerant rice is of
continuing importance. Rice genotypes of varying salt tolerance, such as tolerant (T), semi-tolerant
(ST), and sensitive (S), were grown in field lysimeters in saline soil of ECe 4 and 8 mS cm-1 and alkali
soil of pH 9.5 and 9.8 in North India and analyzed for chlorophyll (Chl), sugar, starch and proline in
leaves. Chlorophyll a and b decreased due to salinity in all the tolerance groups. However, Chl a
was not much affected but chl b increased with alkalinity. Under high stress both at ECe 8 and pH
9.8 Chl a and b were more in tolerant than in sensitive genotypes. The ratio of Chl a/b was similar
in T, ST and S genotypes under salinity stress. Sugar accumulation was higher in T compared to S
under normal conditions but under salinity or alkalinity stress the differences were not significant.
Leaf starch was highest in T, intermediate in ST and lowest in S genotypes in normal as well as
under salinity and alkalinity stress. There was decrease in starch with salinity and alkalinity stress
only in T group but not in ST and S group. Proline increased significantly in all the tolerance groups
even at low salinity of ECe 4 mS cm-1 or pH 9.5. The salt tolerant genotypes of rice maintained
higher levels of Chl a and b, starch and proline under high salinity and alkalinity stress and are the
robust criteria for tolerating high salinity and alkalinity
 
Date 2013
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/7388/1/JSPB_9_1_54-65_2013.pdf
Surekha Rao, P and Mishra, B and Gupta, B and Rathore, A (2013) Physiological Response to Salinity and Alkalinity of Rice Genotypes of Varying Salt Tolerance Grown in Field Lysimeters. Journal of Stress Physiology & Biochemistry, 9 (1). pp. 54-65. ISSN 1997-0838