Fig. 4
From:Cold stress in the harvest period: effects on tobacco leaf quality and curing characteristics
Microstructures of fresh tobacco leaves inside and outside the greenhouse.ais the microstructure of the first group of fresh tobacco leaves inside and outside the greenhouse.bis the microstructure of the second group of fresh tobacco leaves inside and outside the greenhouse. UE, upper epidermis; PT, palisade tissue; ST, sponge tissue; LE, lower epidermis