Overview of autotoxicity in alfalfa (Medicago sativa L.): Identifying gaps between laboratory findings and demonstration at field scale

Paige Baisley, Kimberly A. Cassida
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引用次数: 0

Abstract

Autotoxicity is a type of intraspecific allelopathy in which compounds released by a plant inhibit the growth of other plants of the same species. In alfalfa (Medicago sativa L.), an herbaceous perennial legume widely used in hay and pasture production, autotoxicity is associated with re-establishment failure, reduced yields, and decreased persistence. Several compounds in the phenolic and saponin groups are suspected to contribute to alfalfa autotoxicity, but the exact compounds, ratio of compounds, and concentration of compounds necessary for autotoxicity are not fully defined. Symptoms of autotoxicity, including decreased germination and inhibited root elongation, are consistently observed in laboratory bioassays, but evidence to consistently implicate autotoxicity in poor alfalfa growth at field scale is lacking. This review article presents three criteria that address the production and accumulation of autotoxic compounds in alfalfa and distinguish symptoms of autotoxicity from other inhibitory factors in the field. These criteria provide a useful framework to highlight both competencies and gaps in our current understanding of alfalfa autotoxicity.

Abstract Image

紫花苜蓿(Medicago sativa L.)的自毒性综述:确定实验室发现与田间示范之间的差距
自毒性是一种种内化感作用,一种植物释放的化合物抑制同一物种的其他植物的生长。苜蓿(Medicago sativa L.)是一种广泛用于干草和牧草生产的多年生草本豆科植物,自毒性与重建失败、产量下降和持久性下降有关。一些酚类和皂苷类化合物被怀疑与苜蓿的自毒性有关,但确切的化合物、化合物的比例和自毒性所必需的化合物浓度尚未完全确定。自毒性的症状,包括发芽降低和根伸长抑制,在实验室生物测定中一直观察到,但在田间规模上,缺乏证据一致地表明苜蓿生长不良存在自毒性。这篇综述文章提出了三个标准,解决生产和积累的自毒化合物在苜蓿和区分自毒症状从其他抑制因素在田间。这些标准提供了一个有用的框架,以突出我们目前对苜蓿自毒性的理解的能力和差距。
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