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Opposing effects of plant growth regulators via clonal integration on apical and basal performance in alligator weed
Journal of Plant Ecology ( IF 2.7 ) Pub Date : 2021-08-27 , DOI: 10.1093/jpe/rtab098
Shanshan Qi 1 , Susan Rutherford 2 , Furong He 2 , Bicheng Dong 3 , Bin Zhu 4 , Zhicong Dai 2, 5 , Weiguo Fu 1 , Hanping Mao 1 , Daolin Du 2
Affiliation  

Abstract
Aims
Invasive plants are a major threat to biodiversity and may adversely affect food security. Clonal integration enables the sharing of resources between connected ramets and can enhance plant performance in many invasive species. However, few studies have examined the role of clonal integration when weeds are exposed to plant growth regulators (PGRs). PGRs are used extensively in agriculture and may affect nearby weeds through soil leaching, erosion, and runoff. Our aim was to investigate the effects of clonal integration on growth in a noxious weed, Alternanthera philoxeroides (alligator weed), in response to two PGRs frequently used in agriculture, gibberellins (GA) and paclobutrazol (PAC).
Methods
Ramets of A. philoxeroides were propagated in the greenhouse, and treated with PGRs. PGRs were applied to the older ramets (i.e., ‘basal’ part), with half of the plants having the stems between the apical (younger) and basal parts left connected, while the remaining plants had the stems between the two parts severed. Following the growing period, plants were measured for growth traits.
Important Findings
We found that GA and PAC had contrasting effects on plant growth. GA significantly promoted above-ground growth of the apical ramets via clonal integration. Alternatively, PAC inhibited above-ground growth in the basal and apical parts, and enhanced below-ground growth of the basal and apical ramets through clonal integration. Our results highlight how clonal integration can promote growth in A. philoxeroides following the application of PGRs, which is likely an important mechanism for this species to invade new environments.


中文翻译:

植物生长调节剂通过克隆整合对鳄鱼杂草顶端和基部性能的反作用

摘要
宗旨
入侵植物是生物多样性的主要威胁,可能对粮食安全产生不利影响。克隆整合可以在连接的分株之间共享资源,并可以提高许多入侵物种的植物性能。然而,很少有研究检查杂草暴露于植物生长调节剂 (PGR) 时克隆整合的作用。PGR 广泛用于农业,并可能通过土壤浸出、侵蚀和径流影响附近的杂草。我们的目的是研究克隆整合对有害杂草Alternanthera philoxeroides(鳄鱼杂草)生长的影响,以响应农业中常用的两种 PGR,赤霉素 (GA) 和多效唑 (PAC)。
方法
A. philoxeroides 的分株在温室中繁殖,并用 PGRs 处理。PGR 应用于较老的分株(即“基部”部分),其中一半植物的顶端(较年轻的)和基部部分之间的茎保持连接,而其余植物的两部分之间的茎被切断。在生长期之后,测量植物的生长性状。
重要发现
我们发现 GA 和 PAC 对植物生长有不同的影响。GA通过克隆整合显着促进了顶端分株的地上生长。或者,PAC抑制基部和顶端部分的地上生长,并通过克隆整合增强基部和顶端分株的地下生长。我们的结果强调了在应用 PGR 后克隆整合如何促进A. philoxeroides 的生长,这可能是该物种入侵新环境的重要机制。
更新日期:2021-08-29
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