Published in Scientific Papers. Series A. Agronomy, Vol. LXVI, Issue 1
Written by Aida Patricia SĂRĂCIN, Larisa Marina Elisabeth CHIRIGIU, Ion SĂRĂCIN, Johny NEAMȚU, Ioan Alexandru SĂRĂCIN
The Amaranthus retroflexus species studied has a stem up to 100 cm high, branched, light green to reddish in color, with few leaves at the base, and the upper part with leaves covered with hairy hairs. For the microscopic observation of the internal structure of the Amaranthus retroflexus leaf, the seedlings were first fixed in AFE solution (70% ethyl alcohol, glacial acetic acid, 40% formalin) for 48 hours, after which they were washed with distilled water and preserved in alcohol 70%. The internal structure of an Amaranthus retroflexus leaf was observed in cross-section. It consists of two epidermises, one upper and one lower, as well as mesophyll. Stomata open in the morning under the influence of light (photoactive reaction), when the stomatal cells have a higher degree of turgor than the accessory cells. It was also observed that the opening degree of the stomata reaches a maximum in sunny conditions, when the penetration of CO2, necessary for photosynthesis, is more intense, which determines the transpiration of the leaves at a high intensity.
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