Ten agronomic and fiber properties were studied in
six cotton parents (Gosypium 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 cultivare 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 cultivare 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 seedcottOfl 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 transfering 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 frequent
in 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. |
