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CHINESE JOURNAL OF OIL CROP SCIENCES ›› 2021, Vol. 43 ›› Issue (6): 1061-1069.doi: 10.19802/j.issn.1007-9084.2020286

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Physiological and biochemical response of growth in rapeseed (Brassica napus L.) under low temperature

Lei YAN1(), Liu ZENG1, Yan LYU1, Xiao-yu DING1, Yong CHENG1, Qiang ZHAN2, Xiao-yan WANG3, Wu-zhou BAO3, Xiao-fang LI4(), Xi-ling ZOU1()   

  1. 1.Key Laboratory of Biology and Genetic Improvement of Oil Crops, Ministry of Agriculture and Rural Affairs, Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan 430062, China
    2.Duchang Agricultural and Rural Authority, Jiujiang 332600, China
    3.Macheng Agricultural Technology Extension Center, Macheng 438300, China
    4.Hengyang Academy of Agricultural Science, Hengyang 421000, China
  • Received:2020-09-30 Online:2021-12-22 Published:2021-12-23
  • Contact: Xiao-fang LI,Xi-ling ZOU E-mail:yanlei2723@126.com;nihao9882@163.com;zouxiling@gmail.com

Abstract:

To improve cold tolerance breeding of rapeseed (Brassica napus L.), effect of low temperature on rapeseed growth was studied using 8 cultivars. In natural temperature (falling with 2.75℃ mean temperature), the content of proline and chlorophyll in cold tolerant varieties were higher than those in cold sensitive ones, and the relative conductivity had no significant differences. When the natural temperature rising to the mean temperature of 7.52℃ to 12.39℃, no difference was found of the biomass for the recovery growth in these varieties. Under 10℃/4℃, biomass of all varieties was increased in the first 3 weeks. But from the fourth week, the biomass of cold sensitive varieties decreased with white spots in new leaves. While, the biomass of cold tolerant varieties remained unchanged with white spots appeared in old leaves. Under low temperature, proline continued to increase, and chlorophyll became significantly higher, which resulted in significant growth advantage in cold tolerant rapeseed varieties.

Key words: rapeseed (Brassica napus L.), low temperature, biomass, physiological response

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