Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 430554
Title Auxin-induced Fruit Set in Capsicum annuum L. Requires Downstream Gibberellin Biosynthesis
Author(s) Tiwari, A.; Offringa, R.; Heuvelink, E.
Source Journal of Plant Growth Regulation 31 (2012)4. - ISSN 0721-7595 - p. 570 - 578.
Department(s) Horticultural Supply Chains
Publication type Refereed Article in a scientific journal
Publication year 2012
Keyword(s) plant-growth regulators - pisum-sativum - sweet-pepper - lycopersicon-esculentum - unpollinated ovaries - tomato fruits - pod wall - parthenocarpy - arabidopsis - metabolism
Abstract A hierarchical scheme for the central role of the plant hormones auxin and gibberellins in fruit set and development has been established for the model plants Arabidopsis and tomato. In the fruit crop Capsicum annuum, the importance of auxin as an early signal in fruit set has also been recognized; however, the effect of gibberellins and their interaction with auxin has not yet been studied. The aim of this study was to determine the role of gibberellin and the hierarchy between auxin and gibberellin. We applied gibberellin alone or in combination with auxin or with the gibberellin biosynthesis inhibitor paclobutrazol on stigmas of emasculated flowers. Gibberellin application enhanced fruit set, whereas application of paclobutrazol reduced fruit set. The effect of paclobutrazol treatment could be counteracted by coapplication of gibberellin but not by auxin. These results indicate that in C. annuum, like in Arabidopsis and tomato, auxin is the major inducer of fruit set that acts in part by inducing gibberellin biosynthesis. Interestingly, gibberellin does not significantly contribute to the final fruit size but seems to play an important role in preventing flower and fruit abscission, a major determinant of production loss in C. annuum. At the same time, gibberellin together with auxin seems to balance cell division and cell expansion during fruit growth.
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