Relation between Early Drop of Apple Fruit, Cytokinin and Gibberellin

`McIntosh' apple fruit thinning by benzyladenine in relation to seed number and endogenous cytokinin levels in fruit and leaves

The relationship of 6-benzylaminopurine (BA)-induced fruitlet abscission to seed number and endogenous cytokinin levels in the fruit and leaves was examined in `McIntosh' apples (Malus domestica Borkh.). BA applied at the 10 mm stage of fruit development effectively thinned apple fruit and increased fruit size. The seed number of abscising fruit increased as BA concentrations increased. In pers...

Occurrence of gibberellin a(3) in parthenocarpic apple fruit.

The gibberellins 'have ibeen established as effective fruit setting agents (5). In the apple, where auxins are generallly inactive, the gi'bberellins induce parthenocarpy and sustain fruit growth to maturity (2,6, 10). This pronounced fruit-setting activity and the estafblished observation that asymmetric growtth of apple fruit is related to incomplete seed development, -has encouraged investig...

The Physiology of Apple Pre-harvest Fruit Drop

As apples ripen they begin to produce large amounts of the ripening hormone, ethylene. Ethylene stimulates fruit softening and the formation of an abscission zone in the stem. Ethylene stimulates the production of enzymes (cellulase and polyglacturonase) that break down the cell walls and the glue that holds cell walls together in the abscission zone of the stem, leaving the fruit connected to ...

Cytokinin-Induced Parthenocarpic Fruit Development in Tomato Is Partly Dependent on Enhanced Gibberellin and Auxin Biosynthesis

Fruit set of plants largely depends on the biosynthesis and crosstalk of phytohormones. To date the role of cytokinins (CKs) in the fruit development is less understood. Here, we showed that parthenocarpic fruit could be induced by 1-(2-chloro-4-pyridyl)-3-phenylurea (CPPU, an active CK) in tomato (Solanumlycopersicum cv. Micro-Tom). The fresh weight of CPPU-induced parthenocarpic fruits was co...

Factors Affecting Fruit Set/Early Fruit Drop in Avocado