Factors affecting eastern black nightshade (Solanum ptycanthum) seed germination

Zhou, Jingkai; Deckard, Edward L.; Messersmith, Calvin G.

Factors affecting eastern black nightshade (Solanum ptycanthum) seed germination

2005

Zhou, Jingkai | Deckard, Edward L. | Messersmith, Calvin G.

Effects of environmental factors, especially light, on eastern black nightshade seed germination were studied under growth chamber conditions. Germination occurred only when temperatures were 20 C or higher for 12 to 24 h d⁻⁻¹. Optimum germination occurred within the constant temperature range of 28 to 33 C or with alternating temperatures of 30/25 and 35/30 C. In the dark, eastern black nightshade germination was poor except at high alternating temperatures of 30/25 and 35/30 C. Seed germination was enhanced by light when temperatures were suboptimal. Imbibition was a prerequisite for response of eastern black nightshade seed to light. The light requirement for eastern black nightshade germination was partially overcome by cold stratification, gibberellic acid (GA₃), and high or alternating temperatures. Germination of eastern black nightshade seed was promoted by short exposure to sunlight but was inhibited by prolonged exposure, especially when irradiance was high.Nomenclature: Eastern black nightshade, Solanum ptycanthum Dun. SOLPT.

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