The influence of illumination intensity on the germination of Psidium guajava L. seeds in the greenhouse complex of the Donetsk Botanical Garden

The effect of different illumination levels on the germination of Psidium guajava L. seeds in the greenhouse complex of the Donetsk Botanical Garden was studied. It was determined that a 25 and 50 % decrease in the illumination level reduces the germination of P. guajava seeds by 22.5 % and 42.5 %, whereas the light level of 7124.3 ± 242.7 lux (without shading) facilitates germination of this species in 6,7 days earlier compared to the conditions when it was reduced by 25 % and 50 %. The statistical significance of the illumination level effect on the germination rates in P. guajava seeds was revealed.