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Oraguzie, N.C. et al.

Oraguzie, Iwanami, Soejima, Harada, Hall,

Inheritance of the Md-ACS1 gene and its relationship to fruit softening in apple ( Malus x domestica Borkh.).

The 1-aminocyclopropane-1-carboxylic acid synthase ( ACS) gene is a member of the ACS gene family that is involved in apple ( Malus x domestica Borkh.) fruit ripening. Presence of an allele ( Md-ACS1-2) of this gene is associated with low internal ethylene concentration in some apple cultivars. In this study, inheritance of Md-ACS1 was determined for 50 apple cultivars/advanced selections and 101 F(1) seedlings from five populations. Following this, the softening pattern of apples stored at 20 degrees C for up to 40 days was examined using 35 fruiting cultivars/selections of defined Md-ACS1 status. Md-ACS1 is inherited in a Mendelian fashion and was found to be linked to fruit softening. Maturity season of genotypes also significantly affected fruit softening. Late-season genotypes in the Md- ACS1-2/2 class had the slowest rate of softening, while early-season Md- ACS1-1/1 genotypes had the most rapid softening rate. The implications of these results are discussed in relation to parental selection and breeding for storage ability in apple.[1]

References

Inheritance of the Md-ACS1 gene and its relationship to fruit softening in apple ( Malus x domestica Borkh.). Oraguzie, N.C., Iwanami, H., Soejima, J., Harada, T., Hall, A. Theor. Appl. Genet. (2004) [Pubmed]

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