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The Metabolic Basis of Pollen Thermo-Tolerance: Perspectives for Breeding

Plant Breeding, Wageningen University, Droevendaalsesteeg 1, Wageningen 6708PB, The Netherlands
Plant Research International, Wageningen University Plant Breeding, Droevendaalsesteeg 1, Wageningen 6708PB, The Netherlands
Author to whom correspondence should be addressed.
Metabolites 2014, 4(4), 889-920;
Received: 21 July 2014 / Revised: 10 September 2014 / Accepted: 22 September 2014 / Published: 30 September 2014
(This article belongs to the Special Issue Metabolomics and Biotechnology)
Crop production is highly sensitive to elevated temperatures. A rise of a few degrees above the optimum growing temperature can lead to a dramatic yield loss. A predicted increase of 1–3 degrees in the twenty first century urges breeders to develop thermo-tolerant crops which are tolerant to high temperatures. Breeding for thermo-tolerance is a challenge due to the low heritability of this trait. A better understanding of heat stress tolerance and the development of reliable methods to phenotype thermo-tolerance are key factors for a successful breeding approach. Plant reproduction is the most temperature-sensitive process in the plant life cycle. More precisely, pollen quality is strongly affected by heat stress conditions. High temperature leads to a decrease of pollen viability which is directly correlated with a loss of fruit production. The reduction in pollen viability is associated with changes in the level and composition of several (groups of) metabolites, which play an important role in pollen development, for example by contributing to pollen nutrition or by providing protection to environmental stresses. This review aims to underline the importance of maintaining metabolite homeostasis during pollen development, in order to produce mature and fertile pollen under high temperature. The review will give an overview of the current state of the art on the role of various pollen metabolites in pollen homeostasis and thermo-tolerance. Their possible use as metabolic markers to assist breeding programs for plant thermo-tolerance will be discussed. View Full-Text
Keywords: pollen; heat stress; thermotolerance; high temperature; metabolite; breeding pollen; heat stress; thermotolerance; high temperature; metabolite; breeding
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Paupière, M.J.; Van Heusden, A.W.; Bovy, A.G. The Metabolic Basis of Pollen Thermo-Tolerance: Perspectives for Breeding. Metabolites 2014, 4, 889-920.

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