STUDIES ON RESPONSE TO SELECTION FOR SEED COTTON YIELD IN SEGREGATING GENERATIONS OF COTTON (Gossypium hirsutum L.)
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Date
2001-08-07
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK BANGALORE
Abstract
The study was undertaken to test the efficiency of early generation
selection in both compact and robust genotypes. For this purpose, three
compact crosses viz., RACH-1, RACH-2 and RACH-3 were utilized. The
robust crosses involved in the study were DHH-11, NHH-44, RAHH-1
and RAHH-133. Thus, selection response was studied in both compact
and robust crosses. The comparison of response among compact and
among robusts was done. Further, the response in compact crosses was
compared with the response observed in robust crosses.
In the cross RACH-2, selection response was estimated over
diverse environments to quantify the association between those diverse
environments which in turn, help to identify the genotypes suitable for
(diverse climatic conditions. Correlated response for different quantitative
and quality traits was done in each cross irrespective of robust and
compact type. Heterosis and inbreeding depression was estimated in
segregating generations of both compact and robust crosses. Potential
lines were identified in all the crosses utilised for the study. Finally, an
attempt was made to find out the strength with which each character is
associated to yield in both selected and unselected Fa population of the
cross RACH-2.
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