دراسة التباين في استجابة بعض طرز القمح الطري (Triticum aestivum L.)‎ للإجهاد الملحي في الليزيمترات

الملخص EN

This research work carried out in the Research Station of Izra‘a, during the growing season 2007-008, to evaluate the response of 10 bread wheat genotypes for tolerance of different salinity stress levels (control, 100, 150, and 200 mM NaCl) in Lysimeters.

The experiment was laid according to randomize complete block design (RCBD) in three replicates for each treatment.

A genetic variation in the response of the investigated bread wheat genotypes for NaCl-induced salinity stress was noted.

The production capacity of the salt-tolerant genotypes associated with their capability of minimizing the expansion of peduncle (terminal intrnode), and the flag leaf to some extent.

It has been noticed that the final plant height was determined with the peduncle length under salinity stress conditions, where positive significant correlation (r = 0.60*) occurred between the two traits.

Results showed that the 1000-kernel weight in the bread wheat in general and the investigated genotypes in particular was less susceptible to salinity stress than the number of kernels per plant, because the percentage reduction of 1000-kernel weight at each and every level of salinity was significantly lower (3.50, 13.83, and 31.44 % respectively) compared with that of grain number (4 9.54, 67.78 and 83.28% respectively).

The genotype Cham4, Cham6, Jumaiza9, and Sakha61 were more tolerant to salinity stress, and hence can be used as parents in the genetic improvement and breeding programs to transfer the traits that are genetically-associated with salinity tolerance, with maintaining the yield potential