Changes of abscisic acid, indole-3-acetic acid and gibberellin-like substances in the flowers and developing fruitlets of citrus cultivar ‘Hyuganatsu’

摘要: Abstract Endogenous hormonal changes associated with fruit set and growth were studied in ‘Hyuganatsu’ ( Citrus tamurana [Hort.] ex. Tanaka), a species which has no parthenocarpic ability. Concentrations contents of abscisic acid (ABA), indole-3-acetic (IAA) gibberillin (GA)-like substances measured before, during after anthesis, several floral fruitlet parts. On the day ABA concentration stamens had decreased to about 30% as compared 5 days while IAA petals increased twofold. Eight anthesis (DAA), styles fruitlets markedly, particularly pollinated flowers found highest values per fresh weight recorded this study. The GA-like rose continuously fruitlets, whereas unpollinated ones increase was from 8 DAA. These hormone levels are discussed relation development parts early fruitlets.