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Inheritance of High Glanding, an Insect Resistance Trait in Cotton
Author(s) -
Calhoun D. S.
Publication year - 1997
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1997.0011183x003700040026x
Subject(s) - biology , bollworm , helicoverpa zea , calyx , sepal , botany , heliothis virescens , lepidoptera genitalia , cultivar , horticulture , gossypium , noctuidae , stamen , larva , pollen
The high glanding (HG) trait [i.e., presence of gossypol glands the upper edge of the sepals of the upland cotton ( Gossypium hirsutum L.) flower bud] confers a significant level of resistance to bollworm [ Helicoverpa zea (Boddie)] and tobacco budworm [ Heliothis virescens (F.)], but the inheritance of this trait is not well understood. The objective of this study was to determine the inheritance of the HG trait to aid breeders in developing improved HG cultivars. Crosses were made among HG, normal glanding (NG), and glandless genotypes, and with isolines of the HG breeding line, XG‐15, which had genotypes 2( Gl 2 gl 3 ) and 2( gl 2 Gl 3 ). The isoline, XG‐15 gl 2 Gl 3 , expressed the HG phenotype, leading to the hypothesis that HG is conferred by a special Gl 3 allele derived from XG‐15. Crosses of HG × NG parents resulted in HG F 1 , 3 HG/1 NG ratios in the F 2 , and ratios of 1 HG/2 segregating/1 NG among F 2:3 progeny. Crosses of XG‐15 gl 2 Gl 3 × NG produced similar results. The cross, XG‐15 gl 2 Gl 3 × HG, did not segregate for calyx margin glanding type. The cross, XG‐15 gl 2 Gl 3 × glandless, resulted in glandless flower buds in the F 1 and a ratio of 3 glandless (flower buds)/1 HGin the F 2 . The F 1 HG × glandless had small sparse glands on the base of the sepals. Phenotypes of individual F 2 plants did not appear to fit common segregation ratios, but data from F 2:3 families supported the hypothesis that a special Gl 3 allele confers the HG phenotype. This allele, derived originally from Socorro Island cotton, is tentatively designated Gl S 3 .