内生真菌对高羊茅种子耐干旱能力的影响

摘要

In their evolution, grasses have developed symbiotic associations with fungi that systemically infect grass shoots.Among the latter are grass endophytes, defined as fungi that live their entire life cycle within the aerial portion of the host grass, they do not cause any plant disease symptoms.Endophyte infected can improve biotic and abiotic stress resistance on the host plant.we studied the tall fescue seed of endophyte infection (E+) and endophyte free (E-) on germination under different concentrations PEG6000 stress.The results showed that the endophyte can improve the germination activity, and increased root length under PEG-6000 drought stress.The endophyte infected seed will be better adapted to drought environments.%禾草内生真菌广泛的存在于禾本科植物体内,他们不会引起植物任何感病症状,内生真菌侵染对植株生长有促进作用、且具有提高植物抵抗生物和非生物胁迫能力.本研究以感染内生真菌和非感染内生真菌高羊茅种子为研究对象,研究不同浓度PEG6000胁迫处理下,带菌和不带菌种子萌发能力差异.结果表明:在高羊茅种子萌发时,用PEG-6000模拟干旱胁迫种子,感染内生真菌高羊茅种子的发芽率和胚根长均高于非感染种子的,说明内生真菌浸染能够提高高羊茅种子萌发时的耐旱能力.带菌高羊茅将会更好的适应干旱环境.