Jurick Wayne M, Narvaez Dario F, Brennan Meghan M, Harmon Carrie L, Marois James J, Wright David L, Harmon Philip F
Postdoctoral Research Associate, University of Florida, Gainesville 32611.
Postdoctoral Research Associate, University of Florida - NFREC Quincy 32351.
Plant Dis. 2008 Nov;92(11):1551-1558. doi: 10.1094/PDIS-92-11-1551.
Soybean rust (SBR) survival and host availability (kudzu, Pueraria spp.) were assessed from November 2006 through April 2007 at six sites from the panhandle to southwest Florida. Micro loggers recorded both temperature and relative humidity hourly at each location. Periods of drought and cumulative hours below 0°C correlated with kudzu defoliation. Inoculum potential from detached kudzu leaves was evaluated in vitro under various temperature and relative humidity levels. Kudzu leaves with SBR kept at 4°C produced viable urediniospores with the highest germination at all moisture levels over time. Freezing temperatures (-4 and -20°C) drastically reduced spore germination. However, when leaves were incubated at low (<35%) relative humidity, inoculum potential was prolonged. Results from this study demonstrate that both temperature and relative humidity impact P. pachyrhizi in the field and in vitro, and that detached kudzu leaves have the potential to serve as an inoculum source in kudzu stands.
2006年11月至2007年4月，在佛罗里达州狭长地带至西南部的六个地点对大豆锈病（SBR）的存活情况和寄主可用性（葛藤，野葛属）进行了评估。微型记录器每小时记录每个地点的温度和相对湿度。干旱期和低于0°C的累计小时数与葛藤落叶有关。在不同温度和相对湿度水平下，在体外评估了离体葛藤叶片的接种潜力。带有SBR的葛藤叶片在4°C下保存，随着时间的推移，在所有湿度水平下都产生了活力最强、发芽率最高的夏孢子。冷冻温度（-4°C和-20°C）显著降低了孢子萌发率。然而，当叶片在低相对湿度（<35%）下培养时，接种潜力会延长。本研究结果表明，温度和相对湿度在田间和体外都会影响大豆疫霉，并且离体葛藤叶片有可能成为葛藤林分中的接种源。
