تعیین آستانه تحمل جوانهزنی بذر گندم (رقم چمران) نسبت به تنش خشکی

Tolerance of crops to environmental stresses are different in different developmental stages . The aim of this experiment was to investigate the effect of osmotic stress on seed germination of wheat (cv. Chamran ) and determine the drought tolerance of seed germination . To determine the effect of drought on wheat seed germination solution with an osmotic potential of 0 , -0.3 , -0.6 , -0.9 , -1.2 and -1.5 MPa were used. Time to reach 50 percent by reducing the water potential of the germination of seeds (b) increased. Thus , by lowering the water potential of 0 MPa to -1.5, b value of 34.74 to 139.40 hours of receipt. wheat germination percentage in -0.88 MPa water potential and potential than the (positive) remained stable at around 97 percent, respectively. Lower osmotic potential ( negative ) leads to a decrease in the percentage of germination of wheat seeds were finalized . Also , water potential ( water potential base) threshold of wheat germination in method of x-intercept was estimated -1.84 MPa .