بررسي تاثير خشكي به روي رشد و گره زايي سه گونه شبدر

Investigation of effect of drought on growth and nodulation of three species of clover

Importance of clover in Iran agriculture and also dry climate of most agricultural regions, evalution of different species in different water supply conditions specially in water deficit conditions seems to be necessary. The best dry tolerant species possess highest number of nodes. In this study germination rate of three species of clover were tested to evaluate their germination potential in different water deficit conditions. Results indicates that in different osmotic potentials (artificially caused by polyethyleneglycol) among clover species Trifolium subterraneum represents highest average germination rate and percent as well as, high hypocotyl and radicle length, and T. michelianum exhibits the lowest averages. In seedling stage of clover species T. subterraneum showed highest number of nodes, dry root weight dry stem weight, hypocotyl and radicle length. Finaly between clover species, Trifolium subterraneum exhibited highest tolerance to drought condition and possess highest yield in comparison with other species.