Dynamics of bacterial blight disease in resistant and susceptible rice varieties
Dynamics of bacterial blight disease in resistant and susceptible rice varieties
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DOI：
10.1007/s10658-021-02452-z
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发表时间：
2022-01-07
影响因子：
1.8
通讯作者：
Oliva, Ricardo
中科院分区：
文献类型：
--
作者：
Niones, Jennifer T.;Sharp, Ryan T.;Oliva, Ricardo
白叶枯病（X. oryzaepv. oryzae）是全世界水稻中的一种严重病害。为了更好地控制该疾病，重要的是要了解其流行病学以及其关键方面（例如感染效率和空间传播）如何根据环境（例如当地条件和季节）、管理，特别是品种抗性而变化。为了探索这一点，我们使用机械建模和统计分析相结合的方法，分析了菲律宾四个地点五个季节种植的抗性和易感水稻品种的疾病进展数据。抗病品种的发病率普遍较低。然而，我们没有发现抗性品种的初级感染效率较低的证据，这表明差异很大程度上是由于次级传播的减少。尽管二次传播归因于飞溅扩散，而飞溅扩散因风雨而加剧，但吕宋南部皮拉和维多利亚较潮湿的地点的感染率往往低于吕宋中部较干燥的地点。同样，我们发现在旱季的传播可能很大，因此不应忽视。事实上，我们发现地点是感染尝试次数的更大决定因素，这表明其他环境和管理因素比气候对疾病的影响更大。原发性感染通过疾病发生率的空间随机观察来表征。随着季节的推移，我们观察到一个新兴的短程（1.6米-4米）空间结构，表明二次传播主要是短程的，特别是在种植抗性品种的地方。
Bacterial blight (X. oryzae pv. oryzae) is a serious disease in rice across the world. To better control the disease, it is important to understand its epidemiology and how key aspects of this (e.g. infection efficiency, and spatial spread) change according to environment (e.g. local site conditions and season), management, and in particular, variety resistance. To explore this, we analysed data on the disease progress on resistant and susceptible varieties of rice grown at four sites in the Philippines across five seasons using a combination of mechanistic modelling and statistical analysis. Disease incidence was generally lower in the resistant variety. However, we found no evidence that the primary infection efficiency was lower in resistant varieties, suggesting that differences were largely due to reduced secondary spread. Despite secondary spread being attributed to splash dispersal which is exacerbated by wind and rain, the wetter sites of Pila and Victoria in south Luzon tended to have lower infection rates than the drier sites in central Luzon. Likewise, we found spread in the dry season can be substantial and should therefore not be ignored. In fact, we found site to be a greater determinant of the number of infection attempts suggesting that other environmental and management factors had greater effect on the disease than climate. Primary infection was characterised by spatially-random observations of disease incidence. As the season progressed, we observed an emerging short-range (1.6 m-4 m) spatial structure suggesting secondary spread was predominantly short-range, particularly where the resistant variety was grown.