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12 April 2018 Changes in seed composition and germination of wheat (Triticum aestivum) and pea (Pisum sativum) when exposed to high temperatures during grain filling and maturation
Carolyne Dürr, Sophie Brunel-Muguet, Christine Girousse, Annabelle Larmure, Colette Larré, Agnès Rolland-Sabaté, Marie-Hélène Wagner
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Abstract

Most studies on the effects of climate change have been conducted on grain yield and composition; few have focused on seed germination and storage ability, especially in temperate crops. However, projected higher temperatures at the end of crop cycle are expected to affect not only seed nutritional quality but also seed germination and storage ability. In this study, experiments were conducted on wheat (Triticum aestivum L.) and pea (Pisum sativum L.) in controlled conditions to assess the effects of high maximum daytime temperatures, between 25°C and 35°C, on mother plants during grain filling or only during grain desiccation. Grain composition and seed characteristics related to germination and seed storage were investigated. When the stress occurred during grain filling, seed dry weight decreased, and protein and total fatty acid concentrations increased. Higher contents of vicilins in pea and polyunsaturated fatty acids in both crops were observed. Total starch content decreased in wheat. Sucrose : oligosaccharides ratio decreased, seed conductivity increased and germination was altered in both crops whenever the stress occurred. All of these modifications were mainly detrimental to the seed nutritional and end-use values. Further investigations should be carried out to assess genetic diversity, to characterise other species, and to introduce the impact of high temperatures on these seed characteristics into crop models.

© CSIRO 2018
Carolyne Dürr, Sophie Brunel-Muguet, Christine Girousse, Annabelle Larmure, Colette Larré, Agnès Rolland-Sabaté, and Marie-Hélène Wagner "Changes in seed composition and germination of wheat (Triticum aestivum) and pea (Pisum sativum) when exposed to high temperatures during grain filling and maturation," Crop and Pasture Science 69(4), 374-386, (12 April 2018). https://doi.org/10.1071/CP17397
Received: 24 October 2017; Accepted: 9 January 2018; Published: 12 April 2018
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KEYWORDS
germination
grain
quality
reserves
storage
temperature
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