虎榛子几种菌根苗抗旱机制的研究

选用6个外生菌根菌株为接种体,分别对2个月龄虎榛子实生苗进行接种,培养4个月菌根感染率均超过40.8%.测定各处理苗木生物量、膜透性、SOD活性、MDA含量、叶绿素含量等指标,结果表明:彩色豆马勃、土生空团菌是以提高植物组织水势、SOD活性、降低MDA含量、减轻膜伤害程度、增加根冠比等机制来增强苗木的抗旱性,从而推迟苗木的萎蔫时间与延长干旱临界致死时间;厚环粘盖牛肝菌及点柄粘盖牛肝菌是通过提高苗木SOD活性和脯氨酸含量、降低MDA含量等机制来提高苗木的抗旱性;而卷边桩菇则是通过促进苗木的生长、增强苗木的生长势、降低苗木膜伤害程度、提高SOD活性和脯氨酸浓度、降低MDA含量等多种机制提高苗木的抗旱性.

Research on drought resistance mechanism to different mycorrhizal seedlings of Ostyopsis davidiana

The two_month old Ostryopsis davidiana seedlings was inoculated with 5 different ectomycorrhizal fungus(EMF) (6 strains).The infection rate of every treatment is more than 40.8% after 4 months cultivating. The results of measuring biomass,membrane permeability,activity of SOD,MDA,Chlorophyll, etc. indicated: Pisolithus tinctorius and Cenococcum geophilum increased their drought resistance and deferred the wilting time and the critical dead time by increasing their water potential,activity of SOD,root top ratio, reducing the MDA and lightening the damage level of membrane; Suillus grevillei and Suillus granulatus increased their drought resistance by increasing their proline,the activity of SOD and reducing the MDA; Paxillus involutus increased their drought resistance by manifold mechanisms that accelerating the growth,augmenting the root top ratio,increasing the proline and the activity of SOD,reducing the MDA and lightening the damage level of membrane.