The effect of salinity on chlorophyll levels in 20 sensitive and tolerant genotypes of bread wheat

Mehdi Zohdi Aghdam, Farzad Jalili

Abstract: In order to investigate the concentration of chlorophyll in 20 salinity susceptible and tolerant genotypes of wheat in 2019 an experiment was repeated three in two places as a randomized complete block design. The first place of the farm of the research center was located in khoy (EC of soil and water, 3.5 and 4.5 ds / m), respectively and the second place of the research farm of Urmia was located in the city of Urmia (EC water and soil, 10.2 ds/m and 11.9 ds/m), respectively. The treatments consisted of 12 genotypes, roshan, Sorkh tokhm, Karchya, Mahuti, Gaspard, moghan 3, Arg, Arta, shole, Sistan, Shotordndan, Bolani and 8 lines omidbakhsh KRL-4, Mv-17, N-83-3, 107 -PR-87, S-78-11, 139-PR-87, SNH-9 and 140-PR-87. The results of data combined the analysis of variance for all different traits were significant.The comparison of the mean for different traits showed that the highest concentration of chlorophyll a in Arg cultivar and chlorophyll b in Gaspard cultivar and the lowest concentration of chlorophyll a and b were related to MV-17. The highest a / b ratio was 139-PR-87 and the lowest ratio was Gaspard and Moghan-3. As a result, the a / b ratio due to salinity in susceptible genotypes is less than resistant. The results obtained from the application of salinity stress showed that there is a very significant positive correlation between chlorophyll a and b. The chlorophyll a / b ratio was negatively correlated with chlorophyll a, but was not significant, while the correlation of this ratio with b was very significant and the result of increasing this ratio due to salinity was due to a significant decrease in chlorophyll b. Chlorophyll meter had no significant correlation with any of the chlorophyll concentrations. In the compariison of the percentage of changes in genotypes, it was observed that the tolerant cultivar Arg had the highest percentage of changes in the amount of chlorophyll a, b and total chlorophyll., The result is that due to salinity, the concentration of chlorophyll increased
and this increase was more in tolerant cultivars than in sensitive cultivars.

Keywords: chlorophyll; salinity; wheat

Date published: 2023-08-21