Effect of NaCl stress on growth and some physiological attributes in durum wheat
2002
Alam, S.
Two durum wheat (Triticum durum Desf.) genotypes D 99657 and D 99635 were used in the present studies, and the design applied was completely randomized with factorial arrangement. Four treatments of salinity including control were imposed after regular intervals of 3 days. The plants were irrigated throughout the experiment duration with half strength Hoaglandþs nutrient solution. Data were collected afar every 15 days, and various morphological parameters like shoot dry weight and leaf area were recorded at every harvest then relative growth rate (RGR) and net assimilation rate (NAR) were calculated. Relative growth rate (RGR) and net assimilation rate (NAR) decreased with the increase in salt concentration of the growth medium: The reduction was more in D-99657 than D-99635, while among the intervals, more reduction in above two parameters was not at final interval than first and second ones. Results relating to yield and yield components indicated an inverse relation with increasing salinity. The applied salinity levels significantly decreased spike length, number of tillers, number of grains per spike and 100-grain weight and yield per plant. The effect of NaCl-salinity was on the above said attributes was more in D-99635 than D- 99657. Physiological studies revealed that in leaf, Na+ and Cl concentration in both the durum wheat genotypes were lower than that in culm and root. The extent of Na+ was lower than Cl- Leaf K+ concentration in both durum wheat genotypes was greater than in culm and root. Although, salt stress decreased the growth, yield and physiological attributes in both the genotypes yet D-99657 performed better than D-99635 in all the above said attributes at all the saline levels.
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