Phytotoxic effects of volatile oil from Verbena spp. on the germination and radicle growth of wheat, maize, linseed and canary grass and phenolic content of aerial parts

作者：Dallali S^*; Lahmayer I; Mokni R; Marichali A; Ouerghemmi S; Ltaief H Bel Hadj; Sebei H

来源：Allelopathy Journal, 2014, 34(1): 95-105.

• Allelopathy
• essential oils
• polyphenols
• radicle growth
• seed germination
• Verbena officinalis
• Verbena supina

The volatile constituents and antioxidant activity of aerial parts of vervain (Verbena officinalis L.) and Verbena supina L. 3-Chemotypes from 3-sites (Chenes, Beja, Fernena) were investigated. Essential oils showed inter-and intra-specific variabilities due to 3-chemotypes [(i). V. officinalis from Chenes site (mintsulfide16.27%, 2-phenylethanol 14.61%), (ii). V officinalis from Beja site (12.37% para cymenene, 9.352% of alpha-pinene) and (iii). V. supine from Fernena site, undecane (23.97%) and (E)-4, 8-Dimethyl-1, 3, 7-nonatriene (21.52%)] The effects of essential oil of V. officinalis and V. supina were studied on seed germination and radicle elongation of wheat, maize, linseed and canary grass. The phytototoxic effects were more pronounced on the weed species. The inhibitory effect was more on root growth and was concentration dependent. wheatwas most sensitive and its germination was completely inhibited even at 100 mu l/ml. Total phenols showed no significant variability between the species. Flavonoids were obtained with values of 23.24, 18.39 and 19.10 mgQE/gDW in V. officinalis (Chenes site), V. officinalis (Beja site) and V. supina, respectively. The antioxidant activity of extracts of different samples was evaluated through four extracts. The water and methanol fractions showed interesting antioxidant activity. It was noted during this test that V. officinalis (Chenes) has the greatest reducing power. Allelochemicals of these plants can be exploited as source of natural weedicide to control invasive weed species.

• 出版日期2014-7