Atmospheric moisture influences on conidia development in Podosphaeraxanthii through host-plant morphological responses
Atmospheric moisture influences on conidia development in Podosphaeraxanthii through host-plant morphological responses
复制标题
大气湿度通过寄主植物形态反应影响足圆菌分生孢子的发育
DOI：
10.1007/s10658-013-0309-1
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发表时间：
2013
影响因子：
1.8
通讯作者：
Y.
中科院分区：
文献类型：
--
作者：
Itagaki;K.;Shibuya;T.;Tojo;M.;Endo;R.;Kitaya;Y.
通过寄主植物对水分胁迫的响应，研究了水分胁迫对瓜类白粉病菌分生孢子发育的影响。黄瓜（Cucumis sativusL.）幼苗在高蒸气压亏缺（VPD）（3.8kPa）或低VPD（0.4kPa）下生长。子叶膨大后，将黄孢原毛平革菌孢子接种于子叶近轴面。然后将两种处理的接种幼苗置于维持在2.1kPa的VPD的生长室中。接种后7天，高VPD驯化的子叶上可见的黄曲霉密度是低VPD驯化的子叶上可见的黄曲霉密度的0.46 ~ 0.85倍。这可能是P.由于孢子萌发在处理之间没有差异，因此感染和随后的菌丝发育受到影响。具有吸器的近轴叶表皮细胞的百分比也较低的幼苗，已驯化到较高的VPD。高VPD驯化的子叶更厚，单位面积的干质量更大。子叶的水势没有显着差异的处理，虽然气孔导度的高VPD驯化子叶低于低VPD驯化子叶。由此可见，黄孢原毛平革菌对高浓度VPD驯化子叶发育的抑制作用主要是由叶片形态特征的变化引起的。
This study investigated the effects of atmospheric moisture on conidia development in cucurbit powdery mildew fungus (Podosphaera xanthii) through host-plant responses. Cucumber (Cucumis sativusL.) seedlings were grown under a high vapour pressure deficit (VPD) (3.8 kPa) or a low VPD (0.4 kPa). When the cotyledons had expanded, spores ofP.xanthiiwere inoculated onto the adaxial surface. Inoculated seedlings for both treatments were then placed in a growth chamber maintained at a VPD of 2.1 kPa. The density of visibleP.xanthiicolonies on the high-VPD-acclimated cotyledons was 0.46 to 0.85 times that of the low-VPD-acclimated cotyledons 7 days after inoculation. It is likely the post-germination behaviour ofP. xanthiisuch as the infection and consequent hyphal development was affected because spore germination did not differ between the treatments. The percentage of adaxial epidermal leaf cells with haustoria was also lower in the seedlings which had acclimated to a higher VPD. The high-VPD-acclimated cotyledons were thicker and had greater dry mass per area. The water potential of cotyledons did not differ between the treatments, although the stomatal conductance of high-VPD-acclimated cotyledons was lower than that of low-VPD-acclimated cotyledons. From these results, we conclude that the inhibition ofP.xanthiiconidia development on high-VPD-acclimated cotyledons was mainly caused by changes in leaf morphological properties.