Effect of heat stress during seed development and maturation on wheat (Triticum durum) seed quality. I. Seed germination and seedling vigor

摘要: Two wheat cultivars, Marzak and Oum-rabia, were subjected to three temperature regimes (20/15, 28/21, 36/29 °C) beginning 10 d after anthesis maturity. As expected, high resulted in low values of both seed yield physical traits quality. The effect on germination was not consistent among the two cultivars. High during development maturity had no whereas it decreased Marzak. In contrast germination, vigor adversely affected by heat stress. This decline reflected reduced shoot root dry weight, increased shoot/root ratio, length, number per seedling, conductivity. Excised embryo culture showed marked differences growth potential. Although embryos from all treatments germinated, a delay 24–48 h observed excised seeds grown under co...