Influence of Low Temperature Freezing Injury on Chinese Cabbage Morphological Changes

Chen Fang; Gu Xiaoping; Liang Ping; Yu Fei

doi:10.16765/j.cnki.1673-7148.2017.02.009

Abstract：The production of autumn and winter cabbage is the key to solve the supply of vegetables in slack season in Guizhou province,influenced by low temperature,snow and rain,freezing injury restricts the quality and production quantity of Chinese cabbage which planted in anti-season.Studying the index of low temperature cold injury of Chinese cabbage in Guizhou province,could provide theoretical basis and practical guidance for the disaster warning of low temperature and freezing injury of Chinese cabbage,planting regionalization and anti-season cultivation.The Chinese cabbage of "Lu Bai VI" was used as the experimental material which was universally planted in Guizhou province,in the study,we placed it in the artificial climate chamber at the rosette stage,set up five different constant low temperatures,and four dynamic changes in low temperature according to the diurnal change of temperature in low temperature process under the natural conditions,conducted the low temperature stress respectively,through investigated the relationship between the freezing injury and the strength and duration of low temperature,identified the low temperature cold injury index of Chinese cabbage.The results show that:the low temperature freezing injury critical temperature is-4 ℃ during the rosette stage,duration of 10 h of Chinese cabbage in Guizhou province,the lowest day temperature is-2-0 ℃ of the dynamic mild cold injury index in the low temperature,duration more than 2 d,the lowest day temperature is-4-2 ℃ of the dynamic medium cold injury index in the low temperature,duration 1-2 d,the lowest day temperature is-4--2 ℃ of the dynamic severe cold injury index in the low temperature,duration 2-3 d,the lowest day temperature is-6--4 ℃ of the dynamic extremely low temperature injury index in the low temperature,duration more than 2 d.