Abstract

Info

Title:: Effect of Low Temperature in Winter on Flower Bud Freezing Injury of Pear(Pyrus pyrifolia Nakai）

Author(s):: LI Hanfen1; GUO Yongli2; MA Chunhui2; (1.Library,Qingdao Agricultural University,Qingdao,Shandong 266109；2.College of Horticulture,Qingdao Agricultural University,Qingdao,Shandong 266109)

Abstract:: In order to explore the effects of low temperature on the flower bud freezing injury of pear (Pyrus pyrifolia Nakai),mainly cultivated pear cultivar ‘Hosui’‘Xinli No.7’‘Whangkeumbae’‘Cuiguan’ were used as test materials.Morphological investigation of the flower bud which suffered freezing injury were carried out and the sorbitol content in the branch xylem sap of different pear cultivars were determined,in order to provide a reference for pear production.The results showed that there were significant differences in the degree of flower bud freezing injury among different pear cultivars under -15 ℃ low temperature conditions,flower bud freezing injury was the lightest for ‘Whangkeumbae’,flower bud freezing injury rate was 10%;flower bud freezing injury was the heaviest for ‘Hosui’,flower bud freezing injury rate was about 75%.Axillary flower bud freezing injury rate was higher than spur flower bud.In addition,the results showed that sorbitol content had increased gradually with the passage of dormancy in branches xylem sap of different pear cultivars,from high to low order for ‘Whangkeumbae’＞ ‘Cuiguan’＞ ‘Xinli No.7’＞‘Hosui’.The above results indicated that there was a correlation between sorbitol metabolism and the flower bud freezing injury.The sorbitol accumulation in branches xylem sap might be conducive to improving the cold resistance of flower buds of pear.