Effects of High Temperature on Germination and Growth of Apple Pollen in Style

In order to study effects of high temperature(35 ℃) on germination and growth of pollen tube in style, Red Fuji apple(Malus domestica cv. Red Fuji, ‘Nagafu No.2') used as female in the experiment was pollinated with ‘Starking' apple(M. domestica cv. ‘Starking') pollen. The results showed that temperature affected pollen germination on stigma and growth in style. Compared with control, high temperature accelerated the pollen germination on stigma and tube growth in style. Whereas, at 72 h after pollination, the pollen tube cultivated under high temperature was unusual, being thick and curved, and having nodulation at the bottom, and meanwhile, the style cultivated under high temperature became browning and produced callose, which caused the ceases of tube growth and fertilization in ovule.