Allelopathic activity of Nicotiana plumbaginifolia at various phenological stages on sunflower

作者：Singh Amit; Singh Deepti; Singh N B

来源：Allelopathy Journal, 2015, 36(2): 315-325.

• Allelochemicals
• bioassay
• catalase
• chlorophyll
• Nicotiana plumbaginifolia
• phenological stages
• superoxide dismutase

The leachates from different phenological stages (vegetative, flowering and fruiting) of Nicotiana plumbaginifolia decreased the growth and biochemical parameters of sunflower (Helianthus annuus cv. PAC-36) seedlings. In Petri plate assays, the leachates inhibited the germination and seedling growth of sunflower. In soil culture, the leachates decreased the pigments contents, proteins and the nitrate reductase activity. The decrease was maximum in seedlings treated with leachate from the flowering stage and was concentration dependent. Leachates also caused the oxidative stress and stimulated the activities of superoxide dismutase (SOD) and catalase (CAT). However, SOD and CAT activities inhibited the seedlings growth, when treated with the highest concentration of leachate from the flowering stage. Impaired metabolic activity due to leachates decreased the root and shoot lengths of sunflower. N. plumbaginifolia at the flowering stage was most phytotoxic to sunflower.

• 出版日期2015-10