不同盐胁迫条件下东方杉的生长及生理响应研究  

Growth and Physiological Responses of Taxodium mucronatum×Cryptomeria fortunei Under Different Salt Stress Conditions

作　　者：孔强 马晓华[2] 宫莉霞 张旭乐[2] 项德强 郑坚[2] Kong Qiang;Ma Xiaohua;Gong Lixia;Zhang Xule;Xiang Deqiang;Zheng Jian(Yueqing Forestry Bureau, Wenzhou Zhejiang 325600, China;Institute of Subtropical Crops of Zhengjiang Province, Wenzhou Zhejiang 325005, China)

机构地区：[1]乐清市林业局,浙江温州325600 [2]浙江省亚热带作物研究所,浙江温州325005

出　　处：《西南林业大学学报（自然科学）》2019年第2期179-183,共5页Journal of Southwest Forestry University：Natural Sciences

摘　　要：以健壮且长势一致的2年生东方杉为试验材料,通过设置不同浓度盐胁迫处理,采用水培的方法,分析东方杉的存苗率、枝条增量、叶绿素含量、丙二醛含量、相对电导率及超氧化物歧化酶活性的变化,研究东方杉的抗盐水平及其在不同程度盐胁迫条件下的生长生理变化。结果表明:3‰NaCl胁迫前40 d,东方杉的生长生理变化与CK差异不显著,在第50天时,3‰NaCl胁迫的东方杉生长略微下降。而东方杉在6‰NaCl胁迫下,东方杉生长明显受到抑制,存苗率显著低于CK和3‰NaCl处理;叶片中叶绿素含量明显下降,丙二醛含量和相对电导率显著高于CK,细胞膜完整性遭到一定程度的破坏。可见,东方杉可在短期内抵抗低盐浓度3‰NaCl胁迫,但无法消除6‰盐胁迫引起的生长抑制。Taking strong and consistent 2-year-old Taxodium mucronatum×Cryptomeria fortunei as material.By setting different concentrations of salt stress treatment, hydroponic method was used to analyze the seedling rate, shoot increment, chlorophyll content, malondialdehyde content, relative conductivity and superoxide dismutase. The salt tolerance and physiological changes under different degrees of salt stress were studied. Results show that there is no significant difference between CK and the 3‰ NaCl stress on the growth and physiology changes under 40 days treatment. At the 50 th day of the experiment, the growth of T. mucronatum×C. fortunei treated with 3‰ NaCl is slightly decreased. However, under the 6‰ NaCl stress, the growth of T. mucronatum×C.fortunei is significantly inhibited, and the seedling survival rate is significantly lower than that of CK and 3‰NaCl stress. And chlorophyll content in leaves decreases significantly, MDA content and relative conductivity are significantly higher than those of CK, and the integrity of the cell membrane is destroyed to a certain extent. Thus,T. mucronatum×C. fortunei can resist low salt concentration 3‰ NaCl stress in a short period of time, but it can not eliminate the growth inhibition caused by 6‰ salt stress.

关 键 词：NACL胁迫 生长 生理 东方杉 

分 类 号：S72[农业科学—林木遗传育种]