STUDIES ON COMBINING ABILITY AND HETEROSIS FOR SOME TRAITS OF ROOT AND YIELD CHARACTERS OF SOME RICE GENOTYPES UNDER NORMAL AND WATER DEFICIT CONDITIONS | ||||
Journal of Productivity and Development | ||||
Article 3, Volume 28, Issue 1, January 2023, Page 33-62 PDF (792.62 K) | ||||
Document Type: Original Article | ||||
DOI: 10.21608/jpd.2023.311955 | ||||
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Authors | ||||
El Housieny Daher* ; Sabry El-Naem; Mariam Wissa; Eman Essa | ||||
Rice Research Section, Field Crops Research Institute, ARC, Giza, Egypt. | ||||
Highlights | ||||
Rice, root traits, physiological characters, combining ability, heterosis. | ||||
Supplementary Files
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Full Text | ||||
Eight genotypes cultivars of rice were crossed to obtain 15 F1 crosses, through line x tester mating design was employed for this purpose. The experiment was carried out using line x tester mating design, during 2021 and 2022 rice growing seasons at the experimental farm of Sakha Research Station, Sakha, Kafr El-Sheikh, Egypt. Both GCA and SCA variances were found to be significant or highly significant for all studied traits. The estimates of GCA effects indicated that, the parent IR 12 G 3222 was a good general combiner for root length, number of roots/plant, and flag leaf area under both conditions. In addition, GZ 1368 was a good combiner for root volume under both conditions. While the line IR 69432 was a good combiner for root/shoot ratio under water deficit condition. The line 11 L 236 for chlorophyll content, number of filled grains/panicle, grain yield/plant and the tester Giza 178 for relative water content and grain yield/plant were good combiners under both conditions. On the other hand, the cross combinations, IR 69432 X GZ 1368 was found to be the best specific combinations for root length, number of roots/plant, root volume and root/shoot ratio under two conditions. The cross combination, IR 12 G 3213 XGiza 178 was the best specific combinations for relative water content, flag leaf area and chlorophyll content under both conditions . The cross combination, IR 12 G 3222 XGiza 178 was the best specific combination for 1000-grain weight and fertility % under both conditions. In addition, the cross combination, IR 69432 X GZ 1368 under normal and IR 69432 X Nerica 7 under water deficit were the best specific combinations for grain yield/plant. On the other hand, the crosses, IR 69432 X GZ 1368, IR 6500-127 XNerica 7, IR 12 G 3222 X GZ 1368, 11 L 236 X GZ 1368 and11 L 236 X Nerica 7 exhibited highly significant positive estimates of heterosis as a deviation from mid and better parent for most of the studied traits under normal and water deficit condition. Conclusively,from these results it could be concluded that IR 12 G 3222, GZ 1368, 11 L 236 and Giza 178 were the best general combiners and the crosses IR 69432 × GZ 1368 and IR12G3222 × GZ1368 were the best crosses for estimates of SCA and heterosis effects relative to the mid- and better- parents for most of the studied traits under water deficit and normal conditions.
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