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盐胁迫下外生菌根真菌对油松生长及生理的影响

Keywords: 外生菌根,油松,耐盐性

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Abstract:

采用2种不同的外生菌根真菌Boletusedulis和Xerocomuschrysenteron,在施钠盐量分别为0、0.06、0.12和0.24mol.L-1的盆栽条件下,研究了外生菌根真菌对油松生长发育、细胞质膜透性、根系活力、水分利用等方面的影响。结果表明,在不同的钠处理水平下,与未接种相比,菌根促进了油松幼苗的生长,提高了油松的生物量干重,增长率分别为25.55%、30.96%、61.86%和15.62%、3.06%、17.04%;不同钠盐水平下菌根油松幼苗细胞质膜透性没有发生明显变化,但是接种B.edulis和X.chrysenteron2种菌根真菌对植物细胞质膜透性的影响方式存在差异,随着盐处理浓度的升高,B.edulis菌根植物细胞质膜透性比逐渐增加,而X.chrysenteron菌根植物细胞质膜透性比几乎没有变化;菌根油松幼苗对水分吸收及利用的能力有增强的趋势,相对缺水率有所降低;菌根油松幼苗根系伤流量较非菌根幼苗明显增加,并达到显著水平,其中B.edulis菌根植物分别是非菌根植物的1.10、1.24和1.23倍,X.chrysenteron菌根植物分别比非菌根植物增加了2.85%、10.48%和7.48%。由此认为,接种外生菌根真菌后,菌根通过增强油松苗木细胞质膜的稳定性,提高植物根系的活力,增强植物对水分的利用能力,提高了油松幼苗的耐盐能力。

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