Hydrotime model analysis of Matricaria maritima ssp. inodora seed dormancy

Abstract

Matricaria maritima ssp. inodora is a species with varied life cycles. To investigate the ecophysiology of seed dormancy and germination in this species, we examined the effect of stratification temperature, after-ripening, as well as daily temperature fluctuations. The results were summarized in terms of the hydrotime model for germination. The process of dormancy release took place mainly during wet storage and proceeded much faster at lower temperatures than at higher temperatures. Dry storage did not play an important role in dormancy regulation. Alternating temperatures with an amplitude of 14°C decreased seed germination mainly by increasing their sensitivity to water stress. The hydrotime model allowed a better understanding of the physiological basis of dormancy development and relief.