HEREDITY OF GOSSYPOL GLANDS ON THE BOLL SURFACE IN GOSSYPIUM HIRSUTUM L.

Gossypols confer a good degree of resistance to bollworm and tobacco budworm. Most of the commercially grown cotton varieties have normal gossypol glanding. The objective of the study was to determine the inheritance of the glanding trait with both of the high glanded and glandless genotypes into the genetic background of normally glanded genotype. The information of the inheritance pattern for gossypol glands is very important for breeding high foliage glanding cotton genotypes. For this purpose two cross combinations were made involving a common normal glanding parent (HRVO-1) along with two other parents i.e; high glanding (HG-142) and zero glanding or glandless (Acala 63-74). The non-significant chi square values in F2 for these two crosses showed incomplete dominance for the glanding trait, which was further confirmed by the values of BC2 of both the crosses. Previous studies conducted on the genetics of gossypols were based on visual observations. The gossypol quantification reported herein is more reliable and can be judged more accurately to that of the previous findings; which could not differentiate between the segregated classes in F2 of high glanding and intermediate high glanding in a cross of normal glanding × high glanding and glandless and intermediate glandless in a cross of normal glanding × glandless [ABSTRACT FROM AUTHOR]