Seed germination of five weed species under different temperatures and light conditions

Abstract

Temperature and light may be considered the most important factors affecting seed germination in the presence of several other factors crucial for germination (e.g. water, oxygen, plant hormones). The present study aimed to determine temperature values and corresponding modes of light that are suitable for germination of Artemisia vulgaris L., Amaranthus retroflexus, Ambrosia artemisiifolia L., Cephalaria transsilvanica (L.) Schrader and Stellaria media (L.) Vill. under controlled conditions. Before the experiment began, the collected and dried seeds were stored in the dark, at room temperature. The seeds germinated in distilled water in glass Petri dishes. Amaranthus retroflexus, Ambrosia artemisiifolia and Artemisia vulgaris seeds were stratified before germination. The temperatures at which seed germination occurred differed for each species. The seeds germinated under light and/or in the dark. The results showed that light either failed to affect or stimulated germination. There was no statistically significant difference in the germination of Amaranthus retroflexus and Artemisia vulgaris seeds over the whole temperature range investigated, while seeds of the other investigated species had a narrower range of temperatures suitable for germination.

Uz prisustvo neophodnih faktora klijanja (voda, kiseonik, biljni hormoni), temperatura i svetlost se mogu smatrati najvažnijim činiocima koji utiču na klijanje semena. Cilj naših istraživanja je bio da se odrede vrednosti temperature i odgovarajući režimi svetlosti pogodni za klijanje semena Artemisia vulgaris L., Amaranthus retroflexus L., Ambrosia artemisiifolia L., Cephalaria transsilvanica (L.) Schrader i Stellaria media (L.) Vill. u kontrolisanim uslovima. Prikupljena semena su nakon sušenja čuvana do početka eksperimenta u mraku, na sobnoj temperaturi. Semena su isklijavana u staklenim Petri kutijama, u destilovanoj vodi. Semena Amaranthus retroflexus, Ambrosia artemisiifolia i Artemisia vulgaris su prethodno stratifikovana. Temperature na kojima je vršeno isklijavanje semena su se razlikovale za različite vrste. Semena su isklijavana na svetlosi i/ili u mraku. Dobijeni rezultati eksperimenta pokazuju da svetlost ili nije imala uticaja, ili su semena bolje klijala na svetlosti. Semena Amaranthus retroflexus i Artemisia vulgaris su klijala bez statistički značajne razlike u čitavom dijapazonu ispitivanih temperatura, dok su semena preostalih ispitivanih vrsta imala uži opseg povoljnih temperatura za klijanje.