カラタチにおける極わい性の遺伝および極わい性個体のGA<SUB>3</SUB>に対する反応

Abstract

The inheritance of two types of dwarfism, namely "rosette" and "match" types originating from selfing and crossing of trifoliate orange strains, 'Hiryu' and 'Small leaf C' were investigated. One-year-old seedlings were classified into four tree forms; straight, crooked ('Hiryu'-like), rosette and match. Rosette type seedlings had extremely short internodes, less than 1 mm. Match type ones grew very little after germination. From the segregation patterns of tree form in the populations investigated, it was considered that rosette type and match type were controlled by a single recessive gene and two recessive ones, respectively. The rosette type seedlings responded to GA3 with a significant elongation of their internodes, whereas the match type seedlings did not respond to GA3treatment. The zygotic seedlings occurred at a high rate (47%) in the population from a selfing of 'Hiryu'. Rosette type seedlings in the population were divided into two types, one had straight twigs and the other one had crooked twigs as a result of GA3 treatment.