EFFECTS OF PEG ON STOMATA APPARATUS ULTRASTRUCTURE OF MALUS HUPEHENSIS
聚乙二醇对平邑甜茶叶片气孔器超微结构的影响

The ultrastructure of the stomata apparatus of Malus hupehensis Rehd (pingyitiancha) was observed using transmission electronic microscopy. PEG (Polyethylene glycol) was used in order to mimic drought stress, and the method of preparing ultrastructural slides for stomatal observation was improved. The main results were as follows: 1) the quantity of chloroplasts in guard cells increased, but the quantity of starch grains in a chloroplast decreased with increased PEG treatment time; 2) the quantity of mitochondrion in a guard cell decreased and the structure of mitochondrion was severely damaged when treated with PEG; 3) PEG stress made the vacuoles of the guard cells of Malus hupehensis become smaller or unobvious.