Fig. 4From: Cold stress in the harvest period: effects on tobacco leaf quality and curing characteristicsMicrostructures of fresh tobacco leaves inside and outside the greenhouse. a is the microstructure of the first group of fresh tobacco leaves inside and outside the greenhouse. b is 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 epidermisBack to article page