ArticleInternational journal of molecular sciences2025
Biochemical Insights into Lipid Remodeling in Wheat Anthers Under High-Temperature Stress.
Article in International journal of molecular sciences, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
High-temperature (HT) stress during flowering significantly impairs anther development and pollen fertility, leading to substantial yield loss in wheat. A key aspect of plant adaptation to temperature stress concerns remodeling of lipid metabolism. In this study, heat-tolerant and heat-sensitive wheat cultivars were employed to investigate the biochemical alterations in lipid metabolism in response to high-temperature (HT) stress during anthesis. Pollen viability and SEM demonstrated that, under high temperature, the heat-tolerant cultivar maintained a more stable pollen structure and exhibited higher pollen fertility compared to the sensitive cultivar. Fatty acid analysis showed that HT led to a decrease in the unsaturated fatty acid 18:3 and an increase in the saturated fatty acid 16:0, thereby reducing the double bond index in both cultivars. Lipidomic profiling revealed that HT caused a shift toward higher levels of saturated acyl chains, reducing unsaturation in both phospholipids and galactolipids. Notably, the levels of saturated lipids such as PC (34:0) and PA (36:0) increased markedly upon heat exposure in the heat-tolerant cultivar, whereas only minor changes were observed in the heat-sensitive cultivar. Furthermore, analysis of cuticular lipids showed a reduction in polyunsaturated cutin components under high temperature in wheat anthers. Heat treatment caused a substantial reduction in fertile spikelet rate in both cultivars, while the heat-tolerant cultivar maintained a better seed setting and higher yield. These findings provide biochemical insights into lipid metabolic adjustments that underlie thermotolerance during anthesis in wheat.
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