Effects of relative humidity and high temperature on spore germination and development of tomato powdery mildew (Leveillula taurica)
Effects of relative humidity and high temperature on spore germination and development of tomato powdery mildew (Leveillula taurica)
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DOI：
10.1016/s0261-2194(03)00157-1
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发表时间：
2003-12-01
期刊：
影响因子：
2.8
通讯作者：
Marois, JJ
中科院分区：
文献类型：
--
作者：
Guzman-Plazola, RA;Davis, RM;Marois, JJ
在受控环境中研究了相对湿度和温度对番茄白粉病的影响，以确定影响加州新鲜市场番茄疾病发展的条件。在恒温（20-30℃）条件下，在单个生长室内产生湿度梯度（20-90%），以确定其对成熟番茄植株霉变的影响。30℃及以上的温度对孢子萌发、芽管伸长和病害发展不利。20°c时病变的生长和进展速度明显高于25°c时。低RH水平（20-40%）降低孢子萌发和病变生长，加速宿主组织死亡，减缓疾病进展。中等相对湿度水平（50-70%）增加了孢子的萌发，并优化了疾病的发展，只要温度保持在有利的范围内。高RH水平（80-90%）有利于孢子萌发，但持续暴露在这些条件下导致病变生长和疾病进展有限。每天短时间的高温（35度）（每天两次或三次，至少2小时）抑制了70-92%的疾病发展。(C) 2003 Elsevier Ltd.版权所有。
The effects of relative humidity (RH) and temperature on tomato powdery mildew (Leveillula taurica) were studied in controlled environments to define conditions that affect disease development in fresh market tomatoes in California. Gradients of RH (20-90%) at constant temperatures (20-30degreesC) were generated in single growth chambers to determine their effect on mildew development on mature tomato plants. Temperatures of 30degreesC and above were deleterious for spore germination, germ tube elongation, and disease development. Lesion growth and rate of disease progress were significantly higher at 20degreesC than at 25degreesC. Low RH levels (20-40%) reduced spore germination and lesion growth, accelerated host tissue death and reduced disease progress. Intermediate RH levels (50-70%) increased spore germination and optimized disease development, provided temperatures were maintained within favorable limits. High RH levels (80-90%) were favorable for spore germination but continued exposure to these conditions led to a limited lesion growth and disease progress. Short daily periods (two or three daily exposures of at least 2h) of high temperatures (35degreesC) suppressed disease development by 70-92%. (C) 2003 Elsevier Ltd. All rights reserved.