GENETIC STUDIES ON INTER AND INTER PLANT TYPE CROSSES INVOLVING COMPACT AND ROBUST COTTON
Loading...
Date
2001-08-07
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
UNIVERSITY OF AGRICULTURAL SCIENCES GKVK BANGALORE
Abstract
Cotton is one of the important commercial crops of our country. Existing
robust cotton genotypes are productive but have inaccessibility for plant
protection. Compact cotton genotypes have advantages of plant protection
efficiency, short duration and suitability for machine picking. Present study
was undertaken for evaluation of inter and intra plant type crosses involving
compact and robust cotton genotypes. Interplant type (robust x compact)
crosses were developed through line x tester mating design and intraplant
type (robust x robust) crosses were developed through 7x7 dialleal mating
design.
Most of the inter and intraplant type crosses expressed significant
heterosis over mid and better parents for all the characters studied. GCA
variance was found to be significant and higher in magnitude than significant
SCA variance for all the characters. There were potential inter and intraplant
type crosses involving both parents with high gca effects for yield and yield
component characters in desirable direction. These crosses also expressed
significant sea effects for all the characters. The robust parents RAH221,
RAHlOl and SP46 and compact parent Anjali were identified as best general
combiners based on pooled gca score method.
Among intrahirsutum crosses, the mean values observed for different
quantitative characters indicate that in intracompact cross, seed cotton yield
was lower as compared to intrarobust and interplant type crosses. The
comparison of interplant type crosses and intrarobust crosses revealed that,
even though interplant type crosses showed reduction in plant stature, they
were more productive and heterotic for seed cotton yield.
The trend was different when a similar comparison was made on
interspecific crosses. It was observed that, the crosses of robust hirsutum x
barbadense are more productive than those of compact hirsutum x barbadense.
Description
Keywords
null