Morning glory (Ipomoea spp.), a problematic weed in soybean fields, is difficult to control due to its long emergence period. The intermittent germination of morning glory prolongs the emergence period, and the factors remain unclear. Therefore, we aimed to clarify the effects of different storage periods under natural conditions on germination conditions and emergence percentages of physically dormant entire-leaf morning glory (Ipomoea hederacea var. integriuscula) seeds in the field. In 2017–2020, I. hederacea var. integriuscula was cultivated in outdoor planters. Each plant was tagged on the blooming flower peduncle to record the flowering date. The seeds of I. hederacea var. integriuscula germinated 23 days after flowering (DAF). The water content of the seeds decreased rapidly until 30 DAF, and no water absorption occurred thereafter. The germination percentage of seeds in bags outdoors was low from 45 to 210 DAF, and it increased after 270 DAF irrespective of the temperature (20–35°C). On the field surface, the shorter the period of storage in bags outdoors, the lower the cumulative emergence percentage of I. hederacea var. integriuscula. The cumulative emergence was 0% in the soil for seeds of more than 90 DAF. The survival percentage of seeds in the soil increased with the number of DAFs. Therefore, the longer the DAF of the seeds, the higher the emergence of the field and survival percentage in the soil. The long period of storage on mother plants may be one of the factors associated with the long emergence period.

中文翻译：

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红薯贮藏期与发芽的关系 自然条件下的完整种子

牵牛花( Ipomoea spp.)是大豆田中的一种问题杂草，由于其出苗期长，难以控制。牵牛花的间歇发芽延长了出苗期，其影响因素尚不清楚。因此，我们旨在阐明自然条件下不同贮藏期对田间物理休眠全叶牵牛花（Ipomoea hederacea var. integriuscula）种子萌发条件和出苗率的影响。2017-2020 年，I. hederacea var. integriuscula在室外花盆中种植。每株植物都在开花的花序梗上贴上标签，以记录开花日期。I. hederacea var.的种子。integriuscula在开花后 23 天发芽（DAF）。直到30 DAF，种子的含水量迅速下降，此后不再发生吸水现象。户外袋装种子的发芽率从 45 到 210 DAF 较低，在 270 DAF 之后无论温度（20-35°C）如何都增加。田间地表，户外袋装贮藏时间越短，常春藤累计出苗率越低。整合型. 对于超过 90 DAF 的种子，土壤中的累积出苗率为 0%。土壤中种子的成活率随着 DAF 数量的增加而增加。因此，种子的 DAF 越长，田间出苗率和在土壤中的成活率越高。母株上的长时间储存​​可能是与长出苗期相关的因素之一。