Query (optional)   in Class  All Allele Author Colleague Collection Assembly Gene Gene Class Gene Product Germplasm Image Journal Keyword Library Locus Map Map Data Marker Pathology Polymorphism Probe Protein QTL Rearrangement Reference Sequence Species Trait Trait Study Two Point Data  

---

GrainGenes Gene Class Report: Hooded

[Submit comment/correction]

Gene Class	Hooded
Reference	Sikka SM et al. (1959) Monosomic analysis in bread wheats. II. Identification of chromosomes carrying genes for awning and glume beak shape Indian Journal of Genetics and Plant Breeding 19:56-63. Watkins AE and Ellerton S (1940) Variation and genetics of the awn in Triticum. Journal of Genetics 40:243-270.
LINK	Gene Class description from the Catalog of Gene Symbols for Wheat (WGC) at Komugi
Abbreviation	Hd
See Also	Tipped 1 Tipped awns Awnless Tipped 2
Character affected	Awns
Gene	Hd (Triticum) hd (Triticum)
Locus	Hd
Comment	Dominant inhibitor. Bearded (fully awned) genotype is homozygous hd, b1, b2. Genotypes Hd B2 (e.g., Chinese Spring) and B1 B2 (e.g., Federation) are awnless. Presumably Hd B1 is awnless. Watkins and Ellerton (1137) noted the probability of a third allele 'b1a' leading to a half-awned condition, and in discussion they consider the possibility of a similar third allele at the B2 locus. In view of more recent cytogenic analyses, it seems that the half- awned condition could result from epistatic interactions between the alleles B1 and/or B2 and various promoter genes. Although hooded, half-awned, tip-awned and awnless variants occur among tetraploid wheats, these are relatively infrequent. It has not been established with certainty that the above inhibitors are involved. The inhibitor alleles have a pleiotropic effect on glume-beak shape (966). Acuminate beak is associated with full beardedness and occurs only in b1 b2 types. B2 reduces beak length producing an acute beak shape. B1 reduces beak length producing an obtuse beak shape. In this effect, B1 is epistatic to B2.

GrainGenes is a product of the Agricultural Research Service of the US Department of Agriculture.