Spatial-Temporal Distribution of Allelopathic Rice Roots in Paddy Soil and Its Impact on Weed-Suppressive Activity at the Seedling Stages.
Spatial-Temporal Distribution of Allelopathic Rice Roots in Paddy Soil and Its Impact on Weed-Suppressive Activity at the Seedling Stages.
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DOI：
10.3389/fpls.2022.940218
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发表时间：
2022
影响因子：
5.6
通讯作者：
中科院分区：
文献类型：
--
作者：
化感作用水稻根系分泌的化感物质通过土壤介质传递到受体根际，抑制周围杂草的生长。本研究旨在探讨水稻根系在土壤中的时空分布与苗期杂草抑制能力的关系。本研究首先考察了3个水稻品种在水稻土3 ~ 6叶期垂直和水平方向上的根系分布。在此基础上，通过水稻-稗草混合栽培试验，分析了水稻根系在不同侧土层的化感电位和化感化学物质含量。结果表明，化感水稻在5叶和6叶期5 cm处的根径较小，根长密度、根表面积密度和根干重密度均大于非化感水稻；特别是在水平距离6 ~ 12 cm处，根系分布差异显著。此外，化感水稻在12 cm横向距离处显著抑制了共植稗草的地上部生长，且6 ~ 12 cm土壤圈内化感水稻的苯甲酸衍生物含量高于0 ~ 6 cm土壤圈内。此外，相关分析证实，根在水平距离上的分布与杂草抑制效果和化感物质含量显著相关。这些结果表明，化感水稻根系在水稻土中的空间分布，特别是横向分布，对水稻幼苗期的抑草活性有重要影响，表明改变根系在土壤中的分布可能是增强水稻幼苗抗水稻杂草能力的一种新方法。
Allelochemicals secreted by allelopathic rice roots are transmitted to the receptor rhizosphere through the soil medium to inhibit the growth of the surrounding weeds. This research aimed to explore the relationships between the spatial-temporal distribution of rice roots in soil and weed-suppression ability at its seedling stage. This study first examined the root distribution of three rice cultivars in paddy soil in both vertical and horizontal directions at 3–6 leaf stage. Then, an experiment using rice–barnyardgrass mixed culture was conducted to analyze the allelopathic potential and allelochemical content secreted by rice roots in different lateral soil layers. The results showed that allelopathic rice had a smaller root diameter and larger root length density, root surface area density, and root dry weight density than those of non-allelopathic rice, in the top 5 cm at 5- and 6-leaf stages. In particular, there were significant differences in root distribution at the horizontal distance of 6–12 cm. Besides, allelopathic rice significantly inhibited the above-ground growth of barnyardgrass co-cultured at 12 cm lateral distance in situ, and the content of benzoic acid derivatives in allelopathic rice in a 6–12 cm soil circle was higher than that observed at 0–6 cm distance. Moreover, correlation analysis confirmed that the distribution of roots in the horizontal distance was significantly correlated with weed inhibition effect and allelochemical content. These results implied that spatial distribution of allelopathic rice roots in paddy soil, particularly at the lateral distance, appears to have important impact on its weed-suppressive activity at the seedling stage, suggesting that modifying root distribution in soil may be a novel method to strengthen the ability of rice seedlings to resist paddy weeds.
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影响因子：
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作者：
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