论文部分内容阅读
【目的】为探讨不同盐度土壤土著丛枝菌根(Arbuscular mycorrhizae,AM)真菌对苗期棉花根系形态的影响。【方法】采用in-growth生长系统进行了田间原位研究。【结果】低盐(σ1.0 m S·cm~(-1))、中盐(σ2.1 m S·cm~(-1))、高盐(σ4.0 m S·cm~(-1))土壤条件下,土著AM真菌侵染显著增加了棉花株高、叶片数、蕾数、叶面积指数,说明土著AM真菌能够改善棉花的生长提高耐盐能力。土著AM真菌显著提高了总根长、根体积、根表面积以及直径(d)≤0.5 mm细根根长,低盐土壤条件下土著AM真菌显著增加了d≤0.5 mm细根的根长占总根长的百分比。相关分析表明,棉花总根长、d≤0.5 mm的细根根长与菌根侵染率、叶片磷、钾浓度及吸收量呈显著正相关,与叶片钠浓度呈显著负相关关系;棉花总生物量与叶片吸磷量、吸钾量极显著正相关。【结论】上述结果说明盐渍化土壤中的土著AM真菌侵染对棉花植株的磷、钾等营养状况的改善和棉株钠、氯效应的降低,与土著AM真菌促进细根生长、提高细根根长占总根长的比例有关。
【Objective】 The objective of this study was to investigate the effects of arbuscular mycorrhizae (AM) fungi on cotton root morphology at different salinities. 【Method】 In-growth growth system was used to study in situ field. 【Result】 The results showed that low salinity (σ1.0 mS · cm -1), medium salt (σ2.1 mS · cm -1) and high salt (σ4.0 mS · cm ~ (-1) 1)) Soil AM fungal infection significantly increased cotton plant height, leaf number, bud number, leaf area index, indicating that indigenous AM fungi can improve cotton growth and improve salt tolerance. Native AM fungi significantly increased the total root length, root volume, root surface area and root diameter of fine roots (≤ 0.5 mm), while that of native AM fungi significantly increased d ≤ 0.5 mm under low salt soils The percentage of root length. Correlation analysis showed that there was a significant positive correlation between the root length of cotton root and the infection rate of mycorrhizal root, the concentration and absorption of phosphorus and potassium in the leaves with d≤0.5 mm and negative correlation with leaf sodium concentration. Biomass and leaf uptake of phosphorus, potassium absorption was significantly significant positive correlation. 【Conclusion】 The above results indicate that the improvement of nutrition status of cotton plants such as phosphorus and potassium, and the reduction of sodium and chloride effects in cotton plants are affected by indigenous AM fungi in salinized soils, Root length of the total length of the root length of the ratio.