Production and dispersal of Colletotrichum gloeosporioides spores on Stylosanthes scabra under elevated CO2
Production and dispersal of Colletotrichum gloeosporioides spores on Stylosanthes scabra under elevated CO2
复制标题
DOI：
10.1016/s0269-7491(99)00217-1
复制
发表时间：
2000-01-01
影响因子：
8.9
通讯作者：
Yates, D
中科院分区：
文献类型：
--
作者：
Chakraborty, S;Pangga, IB;Yates, D
本文报道了在受控环境和田间条件下，大气CO2浓度的两倍（700 ppm）对炭疽病病原体Colletotrichum glocosporioides在敏感（菲茨罗伊）和部分抗性（Seca）品种的感染，疾病发展，孢子产生和传播的影响。在菲茨罗伊，但不是在Seca的CO2浓度升高的生长增强，由于炭疽病株高的减少部分补偿。在CO2浓度升高的情况下，炭疽病的严重程度有所降低，尽管这种降低仅在菲茨罗伊有意义。延迟和减少发芽，芽管生长和附着胞生产的部分原因是降低严重性。尽管潜伏期延长，C.在相同的潜伏期内，高CO2和环境CO2下，gloeosporioides形成孢子的病变更快，每天产生更多的孢子。当Fitzroy幼苗生长在700 ppm的CO_2暴露于病原体接种物在田间条件下，他们一贯发展更严重的炭疽病与更多的病变比幼苗生长在环境CO_2，环境变量，这与C的传播和感染最强烈相关。在田间，植物冠层的相对湿度对炭疽病菌孢子的影响最大。我们已经表明，在CO2浓度升高的情况下，扩大的柱花草树冠可以捕获更多的孢子，这可能导致在有利的天气下更严重的炭疽病。这些研究结果的影响，多年生柱花草牧场进行了讨论。(C)2000爱思唯尔科技有限公司版权所有。
This paper reports the effect of twice-ambient (700 ppm) atmospheric CO2 concentration on infection, disease development, spore production and dispersal of the anthracnose pathogen Colletotrichum glocosporioides in susceptible (Fitzroy) and partially resistant (Seca) cultivars of the tropical pasture legume Stylosanthes scabra under controlled environment and field conditions. Reduction in plant height due to anthracnose was partially compensated for by growth enhancement at elevated CO2 in Fitzroy but not in Seca. Anthracnose severity was reduced under elevated CO2 although the reduction was only significant in Fitzroy. Delayed and reduced germination, germtube growth and appressoria production were partly responsible for the reduced severity. Despite an extended incubation period, C. gloeosporioides developed sporulating lesions faster and produced more spores per day within the same latent period at high CO2 and ambient CO2. When Fitzroy seedlings grown at 700 ppm CO2 were exposed to pathogen inoculum under field conditions, they consistently developed more severe anthracnose with more lesions than seedlings grown at ambient CO2, The environmental variable, which correlated most strongly with the dispersal and infection of C. gloeosporioides spores in the field, was relative humidity in plant canopy. We have shown that an enlarged Stylosanthes canopy under elevated CO2 can trap more spores, which can lead to more severe anthracnose under favorable weather. The implications of these findings for perennial Stylosanthes pastures are discussed. (C) 2000 Elsevier Science Ltd. All rights reserved.