We investigated the photosynthesis and leaf development of cherry tomato seedlings grown under five different combinations of red and blue light provided by light-emitting diodes (LEDs). Fresh biomass increased significantly under treatments with blue light percentages of 50, 60, and 75%, with 50% blue-light-grown seedlings accumulating significantly more dry mass. The 25% blue-light-grown seedlings were obviously weaker than those from the other LED treatments. An increase in net photosynthetic rate upon blue light exposure (25-60%) was associated with increases in leaf mass per unit leaf area, leaf area, leaf density, stomatal number, chloroplast and mesophyll cell development, and chlorophyll contents. Our results imply that photosynthesis and leaf development in cherry tomato seedlings are associated with both the proportion and quantity of blue light., X. Y. Liu, X. L. Jiao, T. T. Chang, S. R. Guo, Z. G. Xu., and Obsahuje bibliografii
In anabiotic statě mesophyll cells of both species were filled with vacuoles, chloroplasts were round and without outer envelope and starch. During an 8-d rewatering period cell water saturation deficit continuously (from 80-85 % to 15- 20 %) declined, eliptic shape of chloroplasts was restored, their outer membrane was recovered, grana stacks grew in size and were ordered, stroma was denser, and starch grains started to be formed. The processes were more rapid in Ramonda serbica than in Haberlea rhodopensis. The course of processes was different in irradiated plants than in those kept in the dark.