COMPARATIVE EFFECTS OF TEMPERATURE AND INTERRUPTED WET PERIODS ON GERMINATION, PENETRATION, AND INFECTION OF PUCCINIA-RECONDITA F SP TRITICI AND P-STRIIFORMIS ON WHEAT SEEDLINGS
COMPARATIVE EFFECTS OF TEMPERATURE AND INTERRUPTED WET PERIODS ON GERMINATION, PENETRATION, AND INFECTION OF PUCCINIA-RECONDITA F SP TRITICI AND P-STRIIFORMIS ON WHEAT SEEDLINGS
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DOI：
10.1094/phyto-85-409
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发表时间：
1995-04-01
期刊：
影响因子：
3.2
通讯作者：
GOYEAU, H
中科院分区：
文献类型：
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作者：
DEVALLAVIEILLEPOPE, C;HUBER, L;GOYEAU, H
在最佳温度和非限制湿润持续时间下，Puccinia recondita f 的侵染效率（定义为接种的夏孢子在小麦幼苗叶片上造成病变的比例）高出 12 倍。 sp。小麦优于条状小麦 (P. striiformis)。然而，在 5 至 30 C 之间的几个温度下接种后 1、2、4、6、8 或 16 小时，这两个物种的渗透同样受到 1 小时干旱期和 24 小时湿润期的影响。小麦孢子在穿透前无法在干旱期存活。干旱期中断湿润期不会影响未发芽的尿孢子，它们能够在随后的露水期感染叶子。感染所需的最短连续露水期从最佳温度（条状疫霉为 8℃，小麦疫霉为 15℃）下的 4 至 6 小时增加到次优温度下的至少 16 小时。 P. r. 感染小麦病的发生温度范围很广（5-25℃），而条状小麦的感染仅限于较小的温度范围（5-12℃）。感染百分比作为连续露水期持续时间的函数由具有温度相关参数的理查兹函数描述。对于在感染所需的最小连续露水期之前中断 24 小时露水期的干燥期，特定温度下的感染百分比由中断时间的负指数函数拟合。如果干燥期发生在感染的最短露水持续时间之后，则感染百分比与连续湿润期相同。
Under optimal temperature and nonlimiting wetness duration, the infection efficiency (defined as the proportion of inoculated urediniospores causing lesions on wheat seedling leaves) was 12 times greater for Puccinia recondita f. sp. tritici than for P. striiformis. Penetration of both species, however, was similarly affected by a 1-h dry period interrupting a 24-h wet period 1, 2, 4, 6, 8, or 16 h after inoculation at several temperatures between 5 and 30 C. Appressoria from germinated P. r. tritici urediniospores prior to penetration were unable to survive the I-h dry period. An interruption of the wet period by a dry period did not affect ungerminated urediniospores, which were able to infect leaves during a subsequent dew period. The minimal continuous dew period necessary for infection increased from 4 to 6 h at optimal temperatures (8 C for P. striiformis, 15 C for P. r. tritici) to at least 16 h at suboptimal temperatures. Infection by P. r. tritici occurred over a wide range of temperatures (5-25 C), whereas infection by P. striiformis was restricted to a narrower range (5-12 C). Percentage of infection as a function of the duration of the continuous dew period was described by a Richards's function with temperature-dependent parameters. For a dry period interrupting the 24-h dew period before the minimal continuous dew period necessary for infection, percentage of infection at specific temperatures was fitted by a negative exponential function of time of interruption. If the dry period occurred after the minimal dew duration for infection, percentage of infection was the same as with a continuous wet period.