Study of ecological factors on characteristics of germination of Phalaris minor and Bromus tectorum

In order to recognize the ecological factors on characteristics of germination of Phalaris minor and Bromus tectorum, germination tests were conducted in a randomized complete block design with four replications at the Faculty of Agriculture, Ilam University. The effect of temperature on seed germination in germinator at ۱۵/۱۵, ۲۰/۲۵, ۱۵/۳۰ and ۳۰/۲۰ °C night/day, salinity effects using solutions ۰, ۱۰, ۲۰, ۴۰, ۸۰, ۱۶۰, and ۳۲۰ mM sodium chloride and acidity effects were investigated using buffered solutions with pH adjusted to ۵ to ۹. To study the effect of seed burial depth on the emergence of seedlings in seeds in the research greenhouse of Lorestan University, the seed of each plant was buried at depths of ۰, ۱, ۲, ۳ and ۴ cm. The results showed that the effect of different temperatures on the germination of both plants was significant. So that the highest and lowest germination percentage were at ۲۵/۱۵ (night/day) with ۹۵.۵% and ۲۰/۲۰ (n / d) with ۰%, as well as germination in both dark regimens Absolute and darkness/brightness for Cheatgrass at temperatures of ۲۵.۱۵, ۲۰.۱۰ and ۱۵.۵ ° C was ۹۴%, and no germination was observed at ۲۰/۲۰ °C. Increasing salinity reduced germination for both plants. By increasing the depth, the seedlings of two plants decreased. The lowest and the highest germination percentage of Canary grass in acidity ۵ with ۳۰% and in acidity ۷ with ۹۶% and in Cheatgrass in acidity ۷ were observed and the highest germination with ۹۵% and the lowest in acidity ۹ was ۲۶% also were observed.

Keywords:

acidity , salinity stress , Germination , Alternate temperature , planting depth