Comparative germination of seeds, matured during winter or summer, of some bi-seasonal flowering perennial desert Aiozaceae

In the three species of bi-seasonal flowering perennial desert shrubs tested, seeds matured during winter (under natural short days and low temperatures) and harvested after winter, differed in their ability to germinate from seeds from the same mother plant that matured and were harvested in summer under natural long day and high temperatures. Different rates and levels of germination were also found in the same harvest of seeds, when these imbibed in water at different temperatures in the light, dark or in the dark with brief illumination. -from Author