Interspecific Sterility

The effects of interspecific Y chromosome replacements on hybrid sterility within the Drosophila simulans clade.

We attempted to introgress Y chromosomes between three sibling species of Drosophila: D. simulans, D. sechellia and D. mauritiana. Four D. sechellia Y chromosomes were introgressed into D. simulans without loss of fertility whereas the four reciprocal introgressions (D. simulans Y introgressed into D sechellia) all result in sterility. Both reciprocal Y introgressions of D. simulans and D. maur...

Somatoplastic Sterility as a Cause of Seed Failure after Interspecific Hybridization.

OLLAPSE of the immature seed is a frequent cause of sterility folc lowing interspecific matings in flowering plants. The histological changes leading to failure of fertile ovules of this kind are described in the present paper. Two tissues are primarily involved, endosperm and nucellus. The evidence shows that abortion of the young seed originates in an impaired capacity for growth of the endos...

Sterility

Distinct Subgroups of Cicer echinospermum Are Associated with Hybrid Sterility and Breakdown in Interspecific Crosses with Cultivated Chickpea

Crop wild relatives are a reservoir of phenotypic variation not present in the germplasm of cultivated species and thus have great potential for crop improvement. However, issues of genetic compatibility often interfere with effective utilization of crop wild relative taxa. Among chickpea (Cicer arietinum L.) crop wild relatives, Cicer echinospermum P.H. Davis is the sole species in the seconda...

Sterility in Wheat Hybrids. I. Sterility Relationships and Endosperm Development.

Partial or complete sterility is of frequent occurrence in species crosses. Within the same genus certain species are sterile when crossed while ather combinations are completely fertile. Partial sterility may cause the elimination of certain classes of gametes and prevent desired recombinations of characters in the second generation. Sterility may also cause an abnormal vegetative development....