@entity245 ( @entity245 ) reduces fruit yield and quality in grapevine. Parthenocarpic seedless berries arise from fruit set without effective fertilization due to defective pollen germination. @entity245 has been associated to micronutrient deficiency but the relation of this phenomenon with pollen polymorphism has not been reported before. In this work, six grapevine cultivars with different tendency for @entity245 and grown under micronutrient-sufficient conditions were analyzed to determine pollen structure and germination capability as well as @entity245 rates. Wide variation in non-germinative abnormal pollen was detected either among cultivars as well as for the same cultivar in different growing seasons. A straight correlation with @entity245 rates was found (R2 = 0.9896), suggesting that natural parthenocarpy is related to defective pollen development. Such relation was not observed when @entity245 was analyzed in grapevine plants exposed to exogenous @entity15150 (GA) or @entity2271 ( @entity2272 ) applications at pre-anthesis. Increase (GA treatment) or reduction ( @entity2272 treatment) in @entity245 rates without significative changes in abnormal pollen was determined. Although these plants were maintained at sufficient @entity9725 (B) condition, a down-regulation of the floral genes VvBOR3 and VvBOR4 together with a reduction of floral B content in GA-treated plants was established. These results suggest that impairment in B mobility to reproductive tissues and restriction of pollen tube growth could be involved in the GA-induced parthenocarpy.

Pollen Morphology and XXXX Concentration in Floral Tissues as Factors Triggering Natural and GA-Induced Parthenocarpic Fruit Development in Grapevine.

@entity2272 :: ('CHEBI:2365', 'Chemical') :: ['ABA'] @entity2271 :: ('MESH:D000040', 'Chemical') :: ['abscissic acid'] @entity245 :: ('MESH:D002658', 'Disease') :: ['PFD', 'Parthenocarpic fruit development'] @entity15150 :: ('CHEBI:28833', 'Chemical') :: ['gibberellin'] @entity9725 :: ('MESH:D001895', 'Chemical') :: ['boron']
@entity9725 :: (MESH:D001895,Chemical) :: ['Boron']
