Physiological Response to Salinity and Alkalinity of Rice Genotypes of Varying Salt Tolerance Grown in Field Lysimeters
Year: 2013
Type: article
Abstract: Soil salinity and alkalinity seriously threaten rice production in south Asia. Improving screening \nmethodologies to identify sources of tolerance for improved breeding for salt tolerant rice is of \ncontinuing importance. Rice genotypes of varying salt tolerance, such as tolerant (T), semi-tolerant \n(ST), and sensitive (S), were grown in field lysimeters in saline soil of ECe 4 and 8 mS cm-1 and alkali \nsoil of pH 9.5 and 9.8 in North India and analyzed for chlorophyll (Chl), sugar, starch and proline in \nleaves. Chlorophyll a and b decreased due to salinity in all the tolerance groups. However, Chl a \nwas not much affected but chl b increased with alkalinity. Under high stress both at ECe 8 and pH \n9.8 Chl a and b were more in tolerant than in sensitive genotypes. The ratio of Chl a/b was similar \nin T, ST and S genotypes under salinity stress. Sugar accumulation was higher in T compared to S \nunder normal conditions but under salinity or alkalinity stress the differences were not significant. \nLeaf starch was highest in T, intermediate in ST and lowest in S genotypes in normal as well as \nunder salinity and alkalinity stress. There was decrease in starch with salinity and alkalinity stress \nonly in T group but not in ST and S group. Proline increased significantly in all the tolerance groups \neven at low salinity of ECe 4 mS cm-1 or pH 9.5. The salt tolerant genotypes of rice maintained \nhigher levels of Chl a and b, starch and proline under high salinity and alkalinity stress and are the \nrobust criteria for tolerating high salinity and alkalinity
Authors: P. Surekha Rao, Bhartendu Nath Mishra, S. R. Gupta, A. Rathore
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: green
OpenAlex ID: W2114271869