Factors Affecting Pea Seed and Seedling Rot in Soil
Factors Affecting Pea Seed and Seedling Rot in Soil
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影响土壤中豌豆种子和幼苗腐烂的因素
DOI：
10.1094/phyto-66-188
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发表时间：
1976
期刊：
影响因子：
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通讯作者：
G. E. Short
中科院分区：
文献类型：
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作者：
G. E. Short
温度、土壤湿度、cv。在受控环境室和田间小块试验中，研究了自然侵染和人工侵染土壤中豌豆种子和幼苗腐病的发生、种子颜色和种子处理情况。褶皱种子变异的发病率更高。米拉格林比光滑的阿拉斯加种子更绿，绿色的比黄色的更绿。土壤湿度高时，种子和幼苗腐烂率大于土壤湿度低时。种植前将mirgreenn种子在22℃的水中浸泡48小时，种子和幼苗腐烂的发生率低于对照，可能是由于去除了大部分对病原体有刺激作用的种子渗出物。然而，在10或15度下浸泡48 h，种子和幼苗的腐烂率没有减少，但通常会增加，这可能是由于低温伤害造成的渗出物增加。当生长室温度升高时，腐病的发生率更高。以日为周期交替来模拟野外条件，而不是保持不变，这表明交替的温度。对F. spp和P. spp都有利，它们具有不同的疾病发展最佳条件。
Effects of temp., soil moisture, cv., seed colour, and seed treatments on incidence of pea seed and seedling rot in soil naturally infested with Pythium ultimum and artificially infested with Fusarium solani f. sp. pisi were investigated in controlled environment chambers and field plots. Disease incidence was greater with the wrinkled seeded cv. Miragreen than with the smooth seeded Alaska, and was greater with green than with yellow Miragreen seeds. Seed and seedling rot were greater with high than with low soil moisture. Soaking Miragreen seeds in water at 22 deg C for 48 h prior to planting reduced incidence of seed and seedling rot below controls, presumably due to the removal of the bulk of seed exudates stimulatory to pathogens. However soaking for 48 h at 10 or 15 deg did not decrease, but usually increased, seed and seedling rot over controls, possibly because of increased exudation due to low temp. injury. Incidence of rot was greater when growth chamber temps. were alternated on a diurnal cycle to simulate field conditions than when they were held constant, suggesting that alternating temps. favoured both F. spp. and P. spp., which have differing optima for disease development.