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Autotoxicity of wheat (Triticum aestivum L.) as determined by laboratory bioassays

机译：通过实验室生物测定法确定的小麦（Triticum aestivum L.）自身毒性

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Wheat varietal autotoxicity and varietal allelopathy were assessed based on plant extract and root exudate bioassays under laboratory conditions. Aqueous extract of wheat differed in varietal autotoxicity and varietal allelopathy, inhibiting wheat germination by 2-21%, radicle growth by 15-30%, and coleoptile growth by 5-20%, depending on the combination of the receiver and donor. Extracts of cv Triller or cv Currawong were more allelopathic to other wheat varieties than cv Batavia and cv Federation. Triller extract was more autotoxic than Federation. Assessment of root exudates by the equal-compartment-agar-method further identified the significant differences in varietal autotoxicity and varietal allelopathy of root exudates between wheat varieties, with root exudates of Triller or Batavia showing stronger autotoxic or allelopathic effects than Currawong or Federation. The varietal autotoxicity and allelopathy of root exudates also showed a characteristic radial inhibitory pattern in the agar growth medium. These results suggest that careful selection of suitable wheat varieties is necessary in a continuous cropping system in order to minimize the negative impacts of varietal allelopathy and varietal autotoxicity. Factors affecting autotoxicity in the field and strategies in autotoxicity management are discussed..
机译：在实验室条件下，基于植物提取物和根系分泌物生物测定法评估了小麦品种的自身毒性和品种化感作用。小麦的水提取物在品种自身毒性和品种化感作用方面有所不同，取决于受体和供体的组合，抑制小麦发芽2-21％，抑制胚根生长15-30％，胚芽鞘生长5-20％。特雷勒（Triller）或库拉荣（Currawong）的提取物对其他小麦品种的化感作用比巴达维亚（Badavia）和联合会的化感作用更大。 Triller提取物的毒性比联邦更强。通过等间隔琼脂法对根系分泌物的评估进一步确定了小麦品种之间根系分泌物的品种自身毒性和品种化感作用的显着差异，其中Triller或Batavia的根系分泌物表现出比库拉荣或联邦更强的自体毒性或化感作用。根分泌物的各种自身毒性和化感作用在琼脂生长培养基中也表现出特征性的径向抑制模式。这些结果表明，在连作系统中，必须仔细选择合适的小麦品种，以最大程度地减少品种化感作用和品种自身毒性的负面影响。讨论了影响该领域自身毒性的因素和自身毒性管理策略。

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