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Conspecific leaf litter induces negative feedbacks in Asteraceae seedlings
Ecology ( IF 4.8 ) Pub Date : 2021-10-08 , DOI: 10.1002/ecy.3557
Max M Zaret 1, 2 , Jonathan T Bauer 1, 3, 4 , Keith Clay 1, 5 , Briana K Whitaker 1
Affiliation  

The plant soil feedback (PSF) framework has been instrumental in understanding the impacts of soil microbes on plant fitness and species coexistence. PSFs develop when soil microbial communities are altered due to the identity and density of a particular plant species, which can then enhance or inhibit the local survival and growth of that plant species as well as different plant species. The recent extension of the PSF framework to aboveground microbiota, termed here as plant phyllosphere feedbacks (PPFs), can also help to determine the impact of aboveground microbes on plant fitness and species interactions. However, experimental tests of PPFs during early plant growth are nascent and the prevalence of PPFs across diverse plant species remains unknown. Additionally, it is unclear whether plant host characteristics, such as functional traits or phylogenetic distance, may help to predict the strength and direction of PPFs. To test for the prevalence of litter-mediated PPFs, recently senesced plant litter from 10 native Asteraceae species spanning a range of life history strategies was used to inoculate seedlings of both conspecific and heterospecific species. We found that exposure to conspecific litter significantly reduced the growth of four species relative to exposure to heterospecific litter (i.e., significant negative PPFs), three species experienced marginally significant negative PPFs, and the PPF estimates for all 10 species were negative. However, neither plant functional traits, nor phylogenetic distance were predictive of litter feedbacks across plant species pairs, suggesting that other mechanisms or traits not measured may be driving conspecific negative PPFs. Our results indicate that negative, litter-mediated PPFs are common among native Asteraceae species and that they may have substantial impacts on plant growth and plant species interactions, particularly during early plant growth.

中文翻译:

同种落叶引起菊科幼苗的负反馈

植物土壤反馈 (PSF) 框架有助于了解土壤微生物对植物健康和物种共存的影响。当土壤微生物群落由于特定植物物种的特性和密度而发生改变时,PSF 就会形成,然后可以增强或抑制该植物物种以及不同植物物种的局部存活和生长。最近将 PSF 框架扩展到地上微生物群,这里称为植物叶际反馈 (PPF),也有助于确定地上微生物对植物健康和物种相互作用的影响。然而,在早期植物生长过程中对 PPF 的实验测试尚处于起步阶段,并且 PPF 在不同植物物种中的流行情况仍然未知。此外,尚不清楚植物寄主特征是否,例如功能性状或系统发育距离,可能有助于预测 PPF 的强度和方向。为了测试凋落物介导的 PPF 的流行,最近从 10 种本地菊科物种中衰老的植物凋落物涵盖了一系列生活史策略,用于接种同种和异种物种的幼苗。我们发现,相对于接触异种凋落物(即显着负 PPF),接触同种凋落物显着降低了四种物种的生长,三个物种经历了略微显着的负 PPF,并且所有 10 个物种的 PPF 估计值为负。然而,植物功能性状和系统发育距离都不能预测植物物种对之间的凋落物反馈,表明未测量的其他机制或特征可能会导致同种阴性 PPF。我们的结果表明,负的、凋落物介导的 PPF 在原生菊科物种中很常见,并且它们可能对植物生长和植物物种相互作用产生重大影响,尤其是在植物早期生长期间。
更新日期:2021-12-01
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