Allelopathic Potential of Aerial and Root Extracts of Alfalfa Against Germination and Seedling Related Traits of Four Weed Species.

Volume 16 , Issue 2 , May 2014 , Pages 109-120

Authors

¹ Field Crops Department, Faculty of Agricultural Sciences, University of Sulaimani

In this study, we investigated the effect of aerial and root water extract of Alfalfa

(Medicago sativa) plant on seed germination and seedling growth of four weed species. This

study was carried out in the phytochemistry laboratory/Faculty of Agricultural Sciences/Sulaimani

University. Factorial experiment conducted in Completely Randomized Design (CRD) with 3

replications, including five concentrations 2,4,6,8 and 10 g of aerial and root dry tissues of alfalfa

(Medicago sativa L.) plants per 100ml of MeOH 70% v/v, against germination and seedling growth

of four problematic weeds, which widely distributed in wheat fields, namely cephalaria (Cephalaria

syriaca L.), rye grass (Lolium perenne L.), bitter vetch (Lathyrus linifolius L.) and black mustard

(Brassica nigra L.). Results of experiment showed that extracts from dry tissue of aerial and root

parts of alfalfa greatly inhibited seed germination and seedling growth of weeds at all

concentrations compared to water control. Root extracts had the higher allelopathic potential

toward imbibitions and germination of weeds compared to aerial extracts. Root extract reduced

imbibitions by 61, 54, 61, 54 % and caused germination inhibition I%, by 51, 37, 34, and 47 % in

cephalaria, rye grass, bitter vetch and black mustard respectively. Aerial extracts, significantly

reduced hypocotyls, radicle length and dry weight compared to root extracts. The reduction of

seedling traits of cephalaria, rye grass, bitter vetch and black mustard respectively due to aerial

extracts compared to water control were 52, 52, 32, 35% hypocotyls length reduction, 41, 44, 33,

48% radicle length reduced, 58, 61, 64, 76% hypocotyls dry weight losses and 60, 57, 58, 77% were

losses in radicle dry weight. Allelopathicity increased for aerial and root tissues with increase in

concentrations and the greatest inhibition was 80% equally for imbibitions and I%, which obtained

by 10g dry root tissue per 100 ml MeOH extract occurred in cephalaria, while 10 g dry aerial tissues

per 100 ml MeOH extracts shows the highest inhibition percentages of hypocotyls length by 78% in

rye grass, radicle length by 79% in cephalaria, hypocotyls dry weight and radicle dry weight by

90% both in black mustard.

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