2024-03-28T19:03:26Z
https://niigata-u.repo.nii.ac.jp/oai
oai:niigata-u.repo.nii.ac.jp:00001981
2022-12-15T03:34:49Z
453:454
468:469:470
Changes of ABA, IAA and GAs Levels in Reproductive Organs of Citrus
Changes of ABA, IAA and GAs Levels in Reproductive Organs of Citrus
Kojima, Kiyohide
68
abscisic acid
gibberellin
indole-3-acetic acid
fruit drop
fruit-set
This review provides information about the levels of abscisic acid (ABA), indole-3-acetic acid (IAA) and gibberellins (GAs) in reproductive organs and the effects of uniconazole-P application on those hormones in citrus to analyze their possible relationships with fruit set and growth. Endogenous phytohormone levels in flowers and fruitlets were studied in ‘Hyuganatsu’ (Citrus tamurana [Hort.] Ex. Tanaka), which had no parthenocarpic ability, and Satsuma mandarin (Citrus unshiu Marc. cv. Ozaki). ABA concentration in the style of Satsuma increased 6-fold from the bud to the anthesis stage. Stamens in Hyuganatsu contained higher concentrations of IAA and GAs than in Satsuma. Immediately after pollination, Hyuganatsu showed peaks of ABA and IAA concentrations in fruitlets and parthenocarpic Satsuma also showed smaller peaks of ABA and IAA concentrations. Parthenocarpic fruitlets contained higher concentrations of GAs than pollinated fruitlets after fruit-set. ‘Sepals’ which included floral disks, sepals and receptacles in both setting types contained higher concentrations of ABA than in the nonsetting type, suggesting that ABA in ‘sepals’ plays a positive role. ‘Sepals’ in both setting types contained higher concentrations of IAA after fruit-set, suggesting that IAA from ‘sepals’ may hinder fruitlet abscission. Uniconazole-P, a GA biosynthesis inhibitor, markedly stimulated fruitlet abscission in Satsuma and increased 4-fold the concentration of endogenous ABA in fiuitlets.
journal article
Tropical Agriculture Research Center
1997-12
application/pdf
Japan Agricultural Research Quarterly : JARQ
4
31
271
280
Japan Agricultural Research Quarterly : JARQ
AA0068709X
00213551
https://niigata-u.repo.nii.ac.jp/record/1981/files/31_4_271-280.pdf
eng