Inheritance of the Md-ACS1 gene and its relationship to fruit softening in apple (Malus x domestica Borkh.)
N. C. Oraguzie, H. Iwanami, J. Soejima, T. Harada and A. Hall
TAG Theoretical and Applied Genetics 108 (8): 1526-1533. 2004.
2004
บทคัดย่อ
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 × domesticaBorkh.) 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 F1 seedlings from five populations. Following this, the softening pattern of apples stored at 20°C for up to 40 days was examined using 35 fruiting cultivars/selections of definedMd-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-ACS1-2/2class had the slowest rate of softening, while early-season Md-ACS1-1/1genotypes 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.