GENETIC STUDY ON COTTON PLANT TYPES
Loading...
Date
2003
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
University of Agricultural Sciences, Dharwad
Abstract
To increase productivity of cotton there is a need for identifying plant types suitable for the situation concerned. Plant types of varieties were compared for productivity and plant type traits. These plant types were utilized in developing inter and intra plant type crosses to compare the influence of plant type diversity on heterosis for different traits. Compact varietal plant types were superior than robust because of efficient packing of bolls, better utilization of three-dimensional space and increased plant population per unit area. Intra plant type (robust x robust) crosses were developed through 8x8 diallel mating design and interplant type (robust x compact) crosses were developed through 10x3 line x tester mating design. Most of the inter and intraplant type crosses expressed significant heterosis over mid parent for the characters studied. GCA variance was found to be significant and higher in magnitude than significant SCA x'ariances 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. The robust parents RAB-5, RAH-223 and 4350504 were the most potential combiners based on per cent gca method in diallel study. Based on simple pooled and per cent gca method the lines 4350407,BCCH-3C3 and RAH-223 are recognized as the most potential parents and RACH-221 was recognized as the most potential tester in line x tester analysis. Among the crosses studied, robust x compact crosses were more potential, this is because there is blending of desirable traits coming from robust and compact plant types, such as utilization of additional three dimensional space as seen in robust and efficient packing of bolls as observed in compact plant types. Path analysis has revealed that lint yield followed by number of bolls per plant had highest positive direct effect on seed cotton yield.
Description
Keywords
null
Citation
No . of references 228