Light represents a signal for the regulation of virulence in many microbial pathogens. Two stone fruits, nectarines and cherries, were used to investigate the influence of light on brown rot caused by Monilinia laxa. Three single‐spore isolates were inoculated on nectarines and incubated under different white lights, red light, blue light, green light, and black light with two photoperiods. In addition, to understand the effect of daylight irradiance on brown rot, M. laxa was inoculated on different cherry cultivars and incubated under two simulated solar irradiations. Significantly higher disease severity and sporulation were reported on inoculated nectarines incubated under 58 W white light for 12 hr light/12 hr darkness than on nectarines incubated in continuous darkness. Only red light caused a significant increase in the incidence and severity of the disease in nectarines inoculated with the three M. laxa isolates, compared to fruit incubated under white light. High light intensity (185.45 W/m²), caused greater brown rot severity in all cherry cultivars, both early and late varieties, than low irradiance (145.85 W/m²). Significant up‐regulation of the pathogenicity‐related MlPNL2 gene was observed as an early response after cherry inoculation under high‐intensity light, especially in late cherry cultivars, while MlPG1 expression did not show any changes under different light irradiances. M. laxa was shown to be a light‐responsive fungal pathogen, and light seemed to play an active role in brown rot development.

中文翻译：

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光照对莫妮莉亚疏松果核相互作用的影响

光代表了许多微生物病原体中毒力调节的信号。两种核果，油桃和樱桃，被用来研究光对莫妮莉娅松弛所引起的褐腐的影响。将三个单孢子分离株接种在油桃上，并在不同的白光，红光，蓝光，绿光和黑光下，在两个光周期下孵育。另外，要了解日光照射对褐腐病的影响，M。Laxa将其接种在不同的樱桃品种上，并在两次模拟太阳辐射下孵育。与在连续黑暗中温育的油桃相比，在58 W白光/ 12小时黑暗中温育的接种油桃报告的疾病严重程度和孢子形成明显更高。只有红光导致三种M的油桃接种引起疾病的发生和严重程度的显着增加。与在白光下培养的果实相比，laxa分离株。高光强度（185.45 W / m ²）比低辐照度（145.85 W / m ²）在所有早早品种的樱桃品种中引起更大的褐腐严重程度。致病性相关的MlPNL2的显着上调在强光下接种樱桃后，该基因被认为是早期反应，特别是在晚期樱桃品种中，而MlPG1表达在不同光照下没有显示任何变化。松果支原体被证明是一种对光有反应的真菌病原体，光似乎在褐腐病的发展中起着积极的作用。