首页> 美国卫生研究院文献>Applied and Environmental Microbiology >Differential Inactivation of Seed Exudate Stimulation of Pythium ultimum Sporangium Germination by Enterobacter cloacae Influences Biological Control Efficacy on Different Plant Species
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Differential Inactivation of Seed Exudate Stimulation of Pythium ultimum Sporangium Germination by Enterobacter cloacae Influences Biological Control Efficacy on Different Plant Species

机译:阴沟肠杆菌对终极腐霉孢子萌发种子分泌物刺激的差异灭活影响不同植物物种的生物防治效果。

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摘要

This study was initiated to understand whether differential biological control efficacy of Enterobacter cloacae on various plant species is due to differences in the ability of E. cloacae to inactivate the stimulatory activity of seed exudates to Pythium ultimum sporangium germination. In biological control assays, E. cloacae was effective in controlling Pythium damping-off when placed on the seeds of carrot, cotton, cucumber, lettuce, radish, tomato, and wheat but failed to protect corn and pea from damping-off. Seeds from plants such as corn and pea had high rates of exudation, whereas cotton and cucumber seeds had much lower rates of exudation. Patterns of seed exudation and the release of P. ultimum sporangium germination stimulants varied among the plants tested. Seed exudates of plants such as carrot, corn, lettuce, pea, radish, and wheat were generally more stimulatory to P. ultimum than were the exudates of cotton, cucumber, sunflower, and tomato. However, this was not directly related to the ability of E. cloacae to inactivate the stimulatory activity of the exudate and reduce P. ultimum sporangium germination. In the spermosphere, E. cloacae readily reduced the stimulatory activity of seed exudates from all plant species except corn and pea. Our data have shown that the inability of E. cloacae to protect corn and pea seeds from Pythium damping-off is directly related to its ability to inactivate the stimulatory activity of seed exudates. On all other plants tested, E. cloacae was effective in suppressing damping-off and inactivating the stimulatory activity of seed exudates.
机译:开展这项研究是为了了解阴沟肠杆菌对各种植物的不同生物防治功效是否是由于阴沟肠杆菌灭活种子渗出液对终极腐霉芽孢杆菌萌发的刺激活性的能力不同所致。在生物学对照试验中,阴沟肠杆菌放置在胡萝卜,棉花,黄瓜,生菜,萝卜,番茄和小麦的种子上时,可有效控制腐霉菌的衰减,但不能保护玉米和豌豆不受衰减。玉米和豌豆等植物的种子渗出率高,而棉花和黄瓜种子的渗出率低得多。在所测试的植物中,种子渗出的模式和终极体育孢子囊萌发刺激物的释放均不同。与棉花,黄瓜,向日葵和番茄的分泌物相比,胡萝卜,玉米,生菜,豌豆,萝卜和小麦等植物的种子分泌物通常对终极疟原虫更具刺激性。但是,这与阴沟肠杆菌灭活渗出液的刺激活性并减少终极疟原虫孢子囊萌发的能力没有直接关系。在精液中,阴沟肠杆菌很容易降低除玉米和豌豆外所有植物物种的种子分泌物的刺激活性。我们的数据表明 E 的无效性。 泄殖腔可以保护玉米和豌豆种子免受腐霉菌的腐烂,这直接关系到其灭活种子分泌物刺激活性的能力。在所有测试的其他植物上, E 泄殖腔在抑制阻尼和抑制种子渗出液的刺激活性方面是有效的。

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