Ten agronomic and fiber properties were studied in six cotton parents (Gsypium barbadensa, L.) and their hybrid and reciprocal combinations in 1983 at Sakha Experimental Station. Two parents, Giza 45 and Giza 70 are extra long staple cultivate and the other four viz, Giza 75, Giza 69, Giza 67 and Giza 66 belong to the long—staple group The two extra-long cultivate yield less than their long staple counterparts, however they enjoy the advantage of producing longer, finer and stronger fibers. Our aim was to evaluate the six parental cultivate for CCA and SCA effects and to investigate the possibility of combining the high yield of the long group with better fiber qualities of the extra-long group. Significant general combining ability (GCA) estimates for seedcott ofl yeld/plant (SCY) and boll weight in favorable direction were detected for Giza 75. And significant GCA effects for fiber properties, in favorable direction was detected in Giza 45 and Giza 70. These significant GCA effects suggested the feasibility of transferring higher
yield from Giza 75 to Giza 45 aٌd Giza 70 and incorporating the better fiber qualities of the. latters to Giza 75. However, specific combining ability effects are frequentin fiber properties.which might pose formidable breeding problems. significant reciprocal effects were detected for seed index, lint index and the five fiber characteristics. Those reciprocal effects pertaining to seed index and lint index were few and probably of little consequence. However, those related to fiber properties are abundant and perhaps of some value especially in each of fiber length, fiber
fineness and strength. |
