Heatwaves exacerbate pollen limitation through reductions in pollen production and pollen vigour

IF 2.6 3区 生物学 Q2 ECOLOGY
AoB Plants Pub Date : 2024-09-13 DOI:10.1093/aobpla/plae045
Nick M Rosenberger, Jeremy A Hemberger, Neal M Williams
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引用次数: 0

Abstract

Background and aims Increasingly frequent heat waves threaten the reproduction of flowering plants; compromising the future persistence, adaptive capacity, and dispersal of wild plant populations, and also the yield of fruit-bearing crop plants. Heat damages development of sensitive floral organs and gametes, which inhibits pollen germination, pollen tube growth, and fertilization. However, the role of heat has not been integrated into the framework of pollen quantity and quality limitation and how heat influences the success of cross and self-pollination. Methods We exposed developing flowers to either control temperature (25C:20C) or extreme heat (35C:20C) over 72 hours. We then hand pollinated them with either crossed or self-derived pollen from the same temperature treatment to determine direct and interactive effects of simulated heatwaves on pollen tube growth and resulting seed set. We also collected anthers from virgin flowers to measure heat impacts pollen production. Key results Under cooler control temperatures pollen tube survival of self-derived pollen was approximately 27% lower than that of crossed pollen. Pollen tube survival in heat treated cross-pollinated and heat treated self-pollinated flowers were 71% and 77% lower than cross pollen used control temperatures. These differences in pollen tube survival rate between heat treated cross-pollinated and heat-treated self-pollinated flowers were insignificant. Furthermore, extreme heat reduced seed set by 87%, regardless of pollen origin and also reduced pollen production during flower development by approximately 20%. Conclusions Our results suggest flowers that develop during heatwaves are likely to experience exacerbated pollen quantity and quality limitation driven by changes in pollen production and pollen vigour. Heatwave induced pollen limitation will likely reduce crop yields in agricultural systems, and depress mating and reproduction in wild plant species, the latter of which may hinder the adaptive capacity of plants to a rapidly changing world.
热浪通过降低花粉产量和花粉活力加剧花粉限制
背景和目的 日益频繁的热浪威胁着有花植物的繁殖,损害了野生植物种群未来的生存、适应能力和扩散,也影响了结果作物的产量。热量会破坏敏感花器官和配子的发育,从而抑制花粉萌发、花粉管生长和受精。然而,热量的作用尚未被纳入花粉数量和质量限制的框架,以及热量如何影响异花授粉和自花授粉的成功率。方法 我们将发育中的花朵置于控制温度(25℃:20℃)或极端高温(35℃:20℃)条件下 72 小时。然后,我们用来自相同温度处理的杂交花粉或自花授粉进行人工授粉,以确定模拟热浪对花粉管生长和结实的直接和交互影响。我们还收集了原生花的花药,以测量热对花粉生产的影响。主要结果 在较低的控制温度下,自生花粉的花粉管存活率比杂交花粉低约 27%。经热处理的异花授粉和经热处理的自花授粉花粉管存活率分别比对照温度下的异花授粉低 71% 和 77%。经热处理的异花授粉花和经热处理的自花授粉花的花粉管存活率差异不大。此外,无论花粉来源如何,极端高温都会使结实率降低 87%,并使花朵发育过程中的花粉产量降低约 20%。结论 我们的研究结果表明,在热浪中发育的花朵可能会因花粉产量和花粉活力的变化而加剧花粉数量和质量的限制。热浪引起的花粉限制可能会降低农业系统中的作物产量,并抑制野生植物物种的交配和繁殖,后者可能会阻碍植物对快速变化的世界的适应能力。
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来源期刊
AoB Plants
AoB Plants PLANT SCIENCES-
CiteScore
4.80
自引率
0.00%
发文量
54
审稿时长
20 weeks
期刊介绍: AoB PLANTS is an open-access, online journal that has been publishing peer-reviewed articles since 2010, with an emphasis on all aspects of environmental and evolutionary plant biology. Published by Oxford University Press, this journal is dedicated to rapid publication of research articles, reviews, commentaries and short communications. The taxonomic scope of the journal spans the full gamut of vascular and non-vascular plants, as well as other taxa that impact these organisms. AoB PLANTS provides a fast-track pathway for publishing high-quality research in an open-access environment, where papers are available online to anyone, anywhere free of charge.
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