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Twelve cross combinations depicted positive heterosis for specific flag leaf weight and only 5 crosses (Pak.81 x LU26S, 4943 x Psbn. 90, Psbn. 90 x 4943, LU26S x Pak.81 and 40,72 x Psbn. 90, in descending order) reached the level of significance. Out of these five crosses, 4943 x Psbn. 90, Psbn. 90 x 4943 and Pak.81 x LU26S also showed significant positive heterobeltiosis.

These results indicated the possibility of exploiting the hybrid vigor for the improvement of wheat genotypes for flag leaf traits through selection of transgressive segregants in the later generations. The hybrid Pak.81 x LU26S indicated high heterosis as well as heterobeltiosis for flag leaf weight and specific flag leaf weight while heterosis for flag leaf weight was observed in hybrid LU26S x Pak.81, suggesting the possibility of useful selection for these traits in these crosses. Similarly, the hybrid 4072 x LU26S displayed hybrid vigor for flag leaf area., High heterosis for flag leaf area was also indicated in the cross 4943 x LU26S. These crosses, thus, can be utilized for the improvement in the traits for which they showed heterosis.


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