低温胁迫下外源褪黑素对红花幼苗生长及生理特性的影响  

Effect of Exogenous Melatonin on Growth and Physiological Characters of Carthamus tinctorius L.Under Low Temperature Stress

作　　者：郑东方 周帅 孟雪 刘丰鸣 陈鑫伟 刘卫星 ZHENG Dong-fang;ZHOU Shuai;MENG Xue(Shangqiu Academy of Agricultural and Forestry Sciences,Shangqiu,Henan 476000)

机构地区：[1]商丘市农林科学院,河南商丘476000

出　　处：《安徽农业科学》2025年第8期168-172,共5页Journal of Anhui Agricultural Sciences

基　　金：商丘市科技攻关计划项目(2301006);河南省“四优四化”科技支撑行动计划项目(20220905002)。

摘　　要：研究褪黑素(Melatonin,MT)对低温胁迫下红花幼苗生长及生理特性的影响。以云红花6号和豫红花1号为试验材料,设置常温空白组(CK1)、低温空白组(CK2)及不同浓度褪黑素预处理加低温胁迫组(T1、T2、T3、T4),对同时期的各项生理指标进行测定。结果表明,低温胁迫显著抑制2个红花品种幼苗营养生长,鲜重、干重、SPAD值、SOD活性、POD活性均显著低于常温对照,MDA含量、相对电导率和可溶性糖含量较常温对照有所增加。外施一定浓度MT可有效增加红花幼苗鲜重、干重,叶片SPAD值、SOD活性、POD活性、可溶性糖含量显著增加,并显著抑制幼苗MDA的积累。因此,喷施外源褪黑素能够有效促进红花幼苗在低温胁迫下的生长,缓解低温胁迫对红花的伤害,提高幼苗的抗寒性。100μmol/L褪黑素喷施红花幼苗效果最佳。To investigate the effects of melatonin(MT)on growth and physiological characters of Carthamus tinctorius L.under low temperature stress.With Yunhonghua 6 and Yuhonghua 1 as experimental materials,normal temperature blank group(CK1),low temperature blank group(CK2)and different concentrations of MT pretreatment combined with low-temperature stress groups(T1,T2,T3,T4)were set up and various physiological indicators during the same period were measured.Low temperature stress significantly inhibited the nutritional growth of seedlings of both safflower varieties.Fresh weight,dry weight,SPAD value,the activities of SOD and POD were all significantly lower than those of the control at normal temperature,while MDA content,relative conductivity and soluble sugar content were increased compared to the normal temperature control.After the application of a certain concentration of MT,the fresh weight and dry weight of safflower seedlings increased significantly.The SPAD value,the activities of SOD and POD,and soluble sugar content of seedling leaves were significantly increased,and the accumulation of MDA in seedlings was significantly inhibited.Exogenous melatonin application can effectively promote the growth of safflower seedlings under low temperature stress,alleviate the damage caused by low temperature stress to safflower,and improve the cold resistance of seedlings.In this experiment,the application of 100μmol/L melatonin had the best effect on safflower seedlings.

关 键 词：红花 低温胁迫 褪黑素 生理特性 

分 类 号：S567.219[农业科学—中草药栽培]