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木荷皂甙对稻瘟病菌细胞形态及生理生化指标的影响

, PP. 450-456

Keywords: 木荷皂甙,稻瘟病菌,菌丝体,作用方式

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Abstract:

为开发新型木荷皂甙杀稻瘟剂,分别采用菌丝生长速率法、显微观察、电导法和比色法研究木荷活性皂甙对稻瘟病菌Magnaportheoryzae(Hebert)Barr.的活性,以及对病原细胞形态及其胞外生理生化成分含量的影响。结果显示:木荷皂甙M2IGR5抗稻瘟病菌的EC50为16.41μg/mL、EC90为76.16μg/mL;其EC50和EC90处理稻瘟病菌菌丝体24h后,可导致菌丝断裂、细胞肿胀;处理去壁的原生质体2h即可导致其变型、粘连、破裂,引起病原菌菌丝细胞内含物大量渗漏;处理2h后的可溶性蛋白渗漏量和可溶性总糖分别较对照高10倍和30~60倍,且处理液的电导率升高、几丁质酶活性增强、胞壁几丁质组成成分N-乙酰葡萄糖胺脱落。研究表明,木荷皂甙抗稻瘟病菌不仅导致膜通透性增大、完整性丧失,而且还间接引起细胞壁降解,加速了稻瘟病菌细胞的凋亡。

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