Endogenous hormonal status in citrus flowers and fruitlets: relationship with postbloom fruit drop
Identifieur interne : 002F51 ( Main/Merge ); précédent : 002F50; suivant : 002F52Endogenous hormonal status in citrus flowers and fruitlets: relationship with postbloom fruit drop
Auteurs : Luis V. Pozo [Cuba, États-Unis]Source :
- Scientia Horticulturae [ 0304-4238 ] ; 2001.
Descripteurs français
- Wicri :
- geographic : Cuba.
English descriptors
- KwdEn :
Abstract
Gibberellin accumulation in citrus ovaries has been proposed as an activating signal for fruit set in citrus. Our data under tropical conditions associate pollination-dependent fruiting of ‘Valencia’ orange with high ratios of growth promoters to inhibitors (G/I) in floral organs. Lower values of G/I were found in the parthenocarpic ‘Marsh Seedless’ grapefruit and ‘Ortanique’ tangor, the latter a self-incompatible, seedless hybrid. In all the varieties, two kind of fruitlets were identified at the early stages of fruit development: (1) normal developing fruits, with high peel chlorophyll content, firmly attached to the stem (2) non-growing fruits with lower peel chlorophyll content, prone to early abscission. G/I values of firmly attached fruitlets were higher than those of non-growing, early abscising fruits during the fruit set period. In addition, higher absicisic (ABA) and ABA-like inhibitor accumulation as well as lower growth promoting substances were found in proximal abscission zones of abscising fruits. Furthermore, higher contents of jasmonic acid-like compounds in floral organs and in developing fruits were found in the cultivars with stronger early fruit abscission, which suggest that ABA-like and jasmonic acid-like substances could play a shared role in fruit set and early fruit abscission.
Url:
DOI: 10.1016/S0304-4238(01)00269-2
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ISTEX:D7FB05BD480DF1259CD2F57F2F5770D368FB0B8ALe document en format XML
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<term>Fruit set</term>
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<term>Jasmonates</term>
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<front><div type="abstract" xml:lang="en">Gibberellin accumulation in citrus ovaries has been proposed as an activating signal for fruit set in citrus. Our data under tropical conditions associate pollination-dependent fruiting of ‘Valencia’ orange with high ratios of growth promoters to inhibitors (G/I) in floral organs. Lower values of G/I were found in the parthenocarpic ‘Marsh Seedless’ grapefruit and ‘Ortanique’ tangor, the latter a self-incompatible, seedless hybrid. In all the varieties, two kind of fruitlets were identified at the early stages of fruit development: (1) normal developing fruits, with high peel chlorophyll content, firmly attached to the stem (2) non-growing fruits with lower peel chlorophyll content, prone to early abscission. G/I values of firmly attached fruitlets were higher than those of non-growing, early abscising fruits during the fruit set period. In addition, higher absicisic (ABA) and ABA-like inhibitor accumulation as well as lower growth promoting substances were found in proximal abscission zones of abscising fruits. Furthermore, higher contents of jasmonic acid-like compounds in floral organs and in developing fruits were found in the cultivars with stronger early fruit abscission, which suggest that ABA-like and jasmonic acid-like substances could play a shared role in fruit set and early fruit abscission.</div>
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