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Plants 2014, 3(3), 304-323; doi:10.3390/plants3030304

Shielding Flowers Developing under Stress: Translating Theory to Field Application

The Institute for Plant Sciences and Genetics in Agriculture, The Robert H. Smith Faculty of Agriculture, Food And Environment, The Hebrew University of Jerusalem, Rehovot 76100, Israel
These authors contributed equally to this work.
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Received: 17 April 2014 / Revised: 17 June 2014 / Accepted: 27 June 2014 / Published: 11 July 2014
(This article belongs to the Special Issue Plant Reproductive Transition and Flower Development)
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Abstract

Developing reproductive organs within a flower are sensitive to environmental stress. A higher incidence of environmental stress during this stage of a crop plants’ developmental cycle will lead to major breaches in food security. Clearly, we need to understand this sensitivity and try and overcome it, by agricultural practices and/or the breeding of more tolerant cultivars. Although passion fruit vines initiate flowers all year round, flower primordia abort during warm summers. This restricts the season of fruit production in regions with warm summers. Previously, using controlled chambers, stages in flower development that are sensitive to heat were identified. Based on genetic analysis and physiological experiments in controlled environments, gibberellin activity appeared to be a possible point of horticultural intervention. Here, we aimed to shield flowers of a commercial cultivar from end of summer conditions, thus allowing fruit production in new seasons. We conducted experiments over three years in different settings, and our findings consistently show that a single application of an inhibitor of gibberellin biosynthesis to vines in mid-August can cause precocious flowering of ~2–4 weeks, leading to earlier fruit production of ~1 month. In this case, knowledge obtained on phenology, environmental constraints and genetic variation, allowed us to reach a practical solution. View Full-Text
Keywords: flower development; flowering time; off-season flowering; Passiflora edulis; cytokinins; gibberellins; temperature flower development; flowering time; off-season flowering; Passiflora edulis; cytokinins; gibberellins; temperature
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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Chayut, N.; Sobol, S.; Nave, N.; Samach, A. Shielding Flowers Developing under Stress: Translating Theory to Field Application. Plants 2014, 3, 304-323.

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