T. aestivum

1
Wheat Grain Hardness Genetics
T. aestivum 5DS
T. monococcum 5Am

• Softness is dominant

• Genes at the Ha locus are responsible for the
• production of Friabilin associated with softness

XNor
Ha

• Friabilin is a mixture of Puroindolin A (pinA)
  and B (pinB)

XpinA, XpinB,XGsp

• New allelic variants in grain texture genes
  expand the range of variation in hardness

XNor, Xmwg920
Xmwg920
Genotype Hardness
CS (RE 5D) Null 3 genes 94.4 ? 0.6 A
CS Del 5DS-2 Null 3 genes 93.1 ? 0.6 A
CS (Ti 5D) Null PinA 89.6 ? 0.6 B
CS Normal control 61.6 ? 0.6 C
CS (Ti 5B) Different 5B 56.9 ? 0.6 D
CS 5Am Rec. Double PinA 53.0 ? 0.7 E
10 cM
10 cM
Xtam53
XDor5
Xpsr326
Xabg705
Xtam53
XDor5
Xabg395
Hardness is mainly controlled by the Ha locus on
5DS in bread wheat
Xcdo749
Xwg541