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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/6202

Title: Allelopathic effects of artemisia monosperma del. Ongermination and seedling growth of some range plant species
Authors: Assaeed, A.M.
Keywords: Artemisia monosperma
Hypericifolia
Monosperma plants
Issue Date: 2003
Publisher: Annals Of Agrie. Se., Moshtohor
Citation: Annals Of Agrie. Se., Moshtohor: 41(4); 1383-1395
Abstract: Artemisia monosperma is observed to be as one of the first species todominate disturbed sand dunes in Saudi Arabia. Despite of its importance as asand stabilizer, it has no forage value. It is feared that this species may arrest thenatural succession of vegetation. A series of controlled environment experimentswas conducted to study the potential allelopathic effects of A. monosperma ongermination and seedling growth and survival of some species of sandy habitat(Lasiurus scindicus, Pennesetum divisum, Scrophularia hypericifolia, andPlantago boissieri). In one experiment, seeds were germinated in aqueousextracts prepared from leaves and inflorescence at a ratio of I: 10 weight tovolume. Seeds were also germinated in a polyethylene glycol solution having anosmotic potential similar to that of extracts and in distilled water for comparison.In a second experiment, seeds were sown in IO-cm pots filled with sand andcovered with a layer ofO, 1,2 or 3g ground foliage (leaves and inflorescence) tosimulate the effect of litter leachate on seedling growth and survival. In a thirdexperiment, the effect of root exudates on seedling growth and survival wasstudied by irrigating recipient plants with either tap water (control) or leachatesfrom intact one-year old A. monosperma plants grown in warm (30°C) or cool(20°C) temperatures. Results indicated that seed germination (except in S.hypericifolia) was partially controlled by the osmotic potential of extracts. Theaqueous extracts were not significantly different in their effect on germination.The impact on germination ranged between 50-60% reduction in L. scindicus to acomplete germination inhibition in S. hypericifolia and P. biossieri. Addition ofA. monosperma litter to soil surface decreased seedling relative growth rate(RGR) and survival in proportion to the amount of litter added. Artemisiamonosperma root exudates did not affect seedling biomass but reduced root toshoot ratio regardless of temperature, reduced RGR under warm temperature anddecreased seedling survival especially in S. hypericifolia where complete seedlingdeath occurred irrespective of temperature. These results have some practicalimportance when selecting for species in revegetation programs inA.monosperma- dominated sandy areas.
URI: http://hdl.handle.net/123456789/6202
ISSN: 1110-0419
Appears in Collections:Faculty of Food and Agriculture Sciences Research Center

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