A comparative study reveals the key biological traits causing bioinvasion difference among four alien species of genus Veronica in China

IF 3 2区 环境科学与生态学 Q2 ECOLOGY
Yujing Liu, Hairong Wu, Cong-yan Wang, Jiliang Cheng, Shengze Qiang
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Abstract

The four alien farmland weeds of genus Veronica (i.e., V. arvensis, V. didyma, V. hederifolia, and V. persica) have successfully colonized in China, but caused different ecological consequences in the colonized habitats. However, the key biological traits conferring to bio-invasion differences under different light conditions among the four alien species of Veronica remain unknown. A comprehensive contrastive analysis experiment was conducted to assess the contribution intensity of photosynthetic and sexual and asexual reproductive traits of the four alien Veronica weeds to their invasion level in both field trial and laboratory. The field survey results showed that V. persica had the highest invasion level, V. didyma, V. hederifolia and V. arvensis in turn. Their invasiveness were mainly attributed to photosynthetic-related parameters (LMA) and asexual reproduction traits (the ratio of adventitious root) out of all the 22 tested indexes. The photosynthetic-related and some asexual reproduction indexes from separated determinations under both sun and shade conditions showed that V. persica was able to adapt strong illumination but more tolerant to the shade than the other species. This adaptive differentiation to illumination conferred the four alien Veronica weeds to different competitiveness to crops through allocating resource to the biomass of each organ in farmland. It may conclude that the adaptability to illumination conditions and the asexual reproduction traits may endow their successful invasion and become different important farmland weeds.
一项比较研究揭示了导致中国四种外来Veronica属植物生物入侵差异的关键生物学特征
Veronica属的四种外来农田杂草(即V.arvensis、V.didyma、V.hederifolia和V.persica)已在中国成功定殖,但在定殖的栖息地造成了不同的生态后果。然而,四种外来物种Veronica在不同光照条件下生物入侵差异的关键生物学特征仍然未知。通过田间试验和室内试验,对四种外来Veronica杂草的光合、有性和无性繁殖特性对入侵水平的贡献强度进行了综合对比分析。田间调查结果表明,入侵程度最高的是波斯V.persica,其次是双叶V.didyma、黑叶V.hederifolia和A.arvensis。在所有22个测试指标中,它们的入侵性主要归因于光合相关参数(LMA)和无性繁殖特性(不定根比例)。在日光和遮荫条件下分别测定的光合相关和一些无性繁殖指标表明,与其他物种相比,波斯变种能够适应强烈的光照,但对遮荫的耐受性更强。这种对光照的适应性分化通过将资源分配给农田中每个器官的生物量,赋予了四种外来Veronica杂草对作物不同的竞争力。结果表明,其对光照条件的适应性和无性繁殖特性可能使其成功入侵,成为不同的重要农田杂草。
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来源期刊
Journal of Plant Ecology
Journal of Plant Ecology 生物-植物科学
CiteScore
4.60
自引率
18.50%
发文量
134
审稿时长
3 months
期刊介绍: Journal of Plant Ecology (JPE) serves as an important medium for ecologists to present research findings and discuss challenging issues in the broad field of plants and their interactions with biotic and abiotic environment. The JPE will cover all aspects of plant ecology, including plant ecophysiology, population ecology, community ecology, ecosystem ecology and landscape ecology as well as conservation ecology, evolutionary ecology, and theoretical ecology.
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