Tagged: QTL analysis




Genetics of domestication of yardlong bean

Genetics of domestication of yardlong bean

The genetics of yardlong bean (Vigna unguiculata ssp. unguiculata cv.-gr. sesquipedalis), a vegetable form of cowpea, is of particular interest because the genome of this legume has experienced divergent domestication. Kongjaimun et al. develop two genetic linkage maps and QTL analysis for 24 domestication-related traits and find that the QTLs show co-location on several narrow genomic regions on almost all linkage groups. Comparison with other domesticated species reveals similarities with azuki bean (V. angularis) but differences with rice bean (V. umbellata), and some genomic regions for seed and pod size are conserved. The results provide a foundation for marker-assisted selection...

Continue reading Genetics of domestication of yardlong bean

QTL analysis of heterostyly in Primula

QTL analysis of heterostyly in Primula

Heterostyly and self-incompatibility are usually controlled by the S locus complex, but the usually distylous Primula siebolodii shows continuous variation of anther and stigma position in some populations. Yoshida et al. make a genetic map of the species, and show that major QTLs for stigma and anther heights collocate with the S locus (accounting for 85% of the phenotypic variance). There are additional QTLs controlling anther height and corolla tube length, some being morph-specific. The markers were effective for investigating morph ratios in non-flowering populations, important as floral morphology is a target of selection and ratios differ between populations.

Continue reading QTL analysis of heterostyly in Primula

Seed germination under osmotic and salt stresses

Seed germination under osmotic and salt stresses

Seed germination under osmotic and salt stresses Most genetic studies on the effects of water and salt stresses on seed germination have used conditions that are more extreme than those found in nature. Vallejo et al. apply relatively mild stresses to seeds of Arabidopsis thaliana accessions and find two loci associated with the salt sensitivity response and four associated with the osmotic sensitivity response, one of which only appears to act under mild stress. The regulation of germination under moderate salt and osmotic stresses involves the action of independent major loci, revealing the existence of loci specifically associated with the...

Continue reading Seed germination under osmotic and salt stresses