The effect of environmental stresses on germination of Yellow Starthistle (Centaurea solstitialis)

زارع, احمد and دریس, فاطمه and کریمی, زهرا The effect of environmental stresses on germination of Yellow Starthistle (Centaurea solstitialis). In: 2nd International and 6th National Iranian Congress on Organic vs. Conventional Agriculture, August 2019, Ardabil, Iran.

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Abstract

In order to evaluate the effect of different levels of salinity and drought stress on the germination percentage of Yellow Star thistle (Centaurea solstitialis), experiments were conducted at Agricultural Sciences and Natural Resources of Khuzestan University in 2019. Salinity levels were included (0, 50, 100, 150, 200, 250, 300, 350 and 400 mM) and drought stress levels (0, 0.2, 0.4, 0.6, 0.8, 1, 1.2 and 1.4 MPa, respectively. Increasing drought stress decreased germination percentage of Yellow Star thistle and germination was not observed at 1.4 MPa treatment. The 50% reduction of germination was obtained at 0.69 MPa of drought stress. The results of salinity showed that germination was stopped at 400 mM. According to parameters estimation of three-parameter logistic equation, the 50% reduction in germination at drought stress was 0.69 MPa and for salinity stress was 184 mM. Overall, Yellow Star thistle was more resistant to drought stress than salinity.

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