| 吴会会,邹英宁,吴强盛.干旱胁迫下菌根真菌对枳根系形态、内源激素和土壤结构的影响[J].中国南方果树,2018,47(3): |
| 干旱胁迫下菌根真菌对枳根系形态、内源激素和土壤结构的影响 |
| Mycorrhizal effects on root morphology, phytohormones, and soil structure of trifoliate orange under drought stress |
| 投稿时间：2018-03-07 修订日期：2018-04-10 |
| DOI： |
| 中文关键词: 枳,干旱胁迫,菌根,内源激素, 土壤结构 |
| 英文关键词:trifoliate orange, drought tolerance, mycorrhizas, phytohormone, soil structure |
| 基金项目:湖北省教育厅科学技术研究重点项目(D20171304)；湖北省高等学校优秀中青年科技创新团队计划项目(T201604) |
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| 中文摘要: |
| 季节性干旱是限制柑橘品质和产量重要因素之一，本试验分析了干旱胁迫下摩西管柄囊霉对枳实生苗根系形态、内源激素水平和根际土壤结构的影响。结果表明：干旱胁迫显著降低了摩西管柄囊霉对枳根系的侵染。在正常水分和干旱胁迫下，接种处理显著提高了根系总长、投影面积、表面积以及2级和3级侧根数，降低了平均直径，显著促进了脱落酸、赤霉素、生长素和油菜素内酯在根系的积累。干旱胁迫下，菌根处理显著提高了枳根际总球囊霉素相关土壤蛋白含量，增大了1–2 mm和0.5–1 mm水稳性团聚体比例以及平均质量直径。结果暗示了菌根真菌可通过改善根系形态、调节内源激素平衡和改良土壤结构来提高枳抗旱性。 |
| 英文摘要: |
| The present work tried to evaluate whether and how inoculation with Funneliformis mosseae alters root morphology, phytohormones and soil structure for enhancing drought tolerance of trifoliate orange under well-watered (WW) and drought stress (DS). The results revealed that the DS treatment notably inhibited root colonization by F. mosseae. Mycorrhizal inoculation significantly increased the number of 1st-, 2nd- and 3rd-order lateral roots, root total length, total projected area, total surface area, volume, and decreased average diameter, irrespective of soil water status. The inoculated seedlings showed higher levels of abscisic acid, gibberellins, indole acetic acid, brassinosteroids and methyl jasmonic acid in roots under both WW and DS. Mycorrhizal colonization significantly increased total glomalin-related soil protein, mean weight diameter, and proportion of water-stable aggregates in the size of 2–4 mm, 1–2 mm, and 0.5–1 mm under both WW and DS. Our results therefore suggest that mycorrhizal trifoliate orange seedlings recorded greater root morphology, phytohormone levels, and soil structure, which are important for enhancing drought tolerance of host plants. |
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