Uticaj uslova sredine tokom sazrevanja na klijanje semena mišjakinje (Stellaria media (L.) Vill.)
The effect of environmental conditions during seed maturation on germination of chickweed (Stellaria media (L.) Vill.)
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The timing and dynamic of seed germination of weed plants and factors affecting them make an important segment of knowledge required for planning weed control in agricultural fields. Environmental conditions existing during seed maturation are the most immediate factor affecting morphological and physiological properties of seeds. We investigated the effect of environmental conditions existing during seed maturation of chickweed (Stellaria media (L.) Vill.), a frequent and widespread weed species, on their germination in the dark and after irradiation. Seeds were sampled from chickweed plants grown inside a glasshouse and those growing wild outdoors in the vicinity of the glasshouse at 3-9 day intervals from mid-February to early June 2007. When fruits were setting in both populations simultaneously, the seeds were collected on the same dates inside and outside the glasshouse. Chickweed plants that grew outdoors began flowering and fruiting more than a month later than those growing in the glasshouse. Plants growing inside the glasshouse stopped fruiting about 20 days after those around the glasshouse. Two months after the last harvest, in August, germinability of the collected seeds was investigated. Despite the different conditions in which seeds had matured, no statistically significant difference was detected in germinability in the dark between the seeds sampled inside and outside the glasshouse, except in two of the 14 pairs of samples collected on the same dates. On the other hand, there were considerable and statistically significant differences in germinability depending on sampling dates. The lowest germination was found in samples collected both inside and outside the glasshouse in late March and early April. Irradiation of imbibing seeds with white daylight stimulated germination of all samples and significantly decreased the differences in germinability of seeds collected on different dates, while not eliminating them fully.