Abstract
F 2 progeny from F 1 plants monosomic for chromosome IX of Hymar obtained from the cross of chromosome IX deficient Chinese Spring × Hymar, a variety of club wheat, were studied for spike type segregation and chromosomal constitution. Spikes from plants with two members of chromosome IX from Hymar were club, intermediate, or common-type. Spikes from plants monosomic for chromosome IX were likewise club, intermediate, or common type but all had typical speltoid characteristics. When the spike type segregates were combined, there resulted an almost perfect fit to a 1:2:1 ratio of club, intermediate, and common spike type plants, respectively, indicating that chromosome IX was not associated with inheritance of spike type. It is suggested that subcompactoidy and compactoidy resulting from an increase in the dosage of chromosome IX is caused by an increase in the dosage of the gene for square-headedness carried by this chromosome. The shortening of plants having higher dosages of chromosome IX is probably caused by abnormal chromosomal constitution resulting in genetic unbalance.
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Claims 6
Claim · model-written summary
Plants with two Hymar chromosome IX copies had club, intermediate, or common spikes.
Verbatim
e0“Spikes from plants with two members of chromosome IX from Hymar were club, intermediate, or common-type.”
Claim · model-written summary
Monosomic plants had the same spike categories but speltoid traits.
Verbatim
e0“Spikes from plants monosomic for chromosome IX were likewise club, intermediate, or common type but all had typical speltoid characteristics.”
t0“HEXAPLOID WHEAT”
Claim · model-written summary
Combined spike types nearly fit a 1:2:1 ratio.
Verbatim
e0“there resulted an almost perfect fit to a 1:2:1 ratio of club, intermediate, and common spike type plants”
t0“HEXAPLOID WHEAT”
Claim · model-written summary
Chromosome IX was not associated with spike type inheritance.
Not reportedDirection
Verbatim
e0“chromosome IX was not associated with inheritance of spike type”
t0“HEXAPLOID WHEAT”
Claim · model-written summary
The authors suggest increased chromosome IX dosage causes subcompactoidy and compactoidy through increased square-headedness gene dosage.
Verbatim
e0“subcompactoidy and compactoidy resulting from an increase in the dosage of chromosome IX is caused by an increase in the dosage of the gene for square-headedness carried by this chromosome”
t0“HEXAPLOID WHEAT”
Claim · model-written summary
Shorter plants at higher chromosome IX dosage are probably due to genetic imbalance.
Verbatim
e0“The shortening of plants having higher dosages of chromosome IX is probably caused by abnormal chromosomal constitution resulting in genetic unbalance.”
t0“HEXAPLOID WHEAT”