Salinity Tolerance of some cultivars of Berseem (Trifolium alexandrinum L.) during Germination and Early Seedling Growth
Agarwal Shipra, Singh Bhupendra, Alka, Kumar P
Botany Department, Hindu College, Moradabad–244 001, India.
The salinity tolerance of 20 cultivars of berseem (Trifolium alexandrinum L.) was tested under varying salt stresses (3, 6, 7.2, 10, 12 and 14 dSm–1) during germination and early seedling stage. Germination was differentially affected at different salinity levels. Genotypes JB 1, JHB 04–2, SAIDI and WARDAN had shown minimum inhibition in % germination at 10, 12 and 14 dSm–1 while cultivars BL 10, UPB 110, FAHLI and JHB 05–2 had expressed maximum inhibition. Dry weight of shoot decreased with increase in salinity levels but significant reductions were obtained only at higher salinity levels (7.2–14 dSm–1). All values for SS, PR and SSI indicated positive correlations with that of NS of shoot dry weight. Perfect positive correlations (r = 1**, P = 0.01) were obtained between SSI and PR of shoot dry weight. Dry weight of root and seedling also declined with increase in salinity but significant reductions were noted at 6–14 dSm–1 in all cultivars tested. Seedling dry weight indicated that all genotypes registered significant reductions at 6 to 14 dSm–1. Correlation coefficient (r values) indicated strong positive correlation between SS and NS and perfect positive correlation was observed between SSI and PR for seedling dry weight. On the bases of SSI, SHSI and seedling dry weight cv. BL 22 and WARDAN have been proved to be tolerant while BL 10 and JHB 05–1 have been proved sensitive on the bases of SSI and SHSI. Cultivars HFB, MESCAVI, BB 2 and JHB 05–2 also proved as sensitive on the bases of SSI and seedling dry weight.