摘要
为了解瓜多竹(Guadua amplexifolia)的耐盐性,对2年生盆栽苗进行了不同浓度NaCl胁迫处理,结果表明:以处理40d的叶片脱落率将盐害程度分为无盐害(<10%)、轻度盐害(10%～50%)和重度盐害(>50%)3级;随着胁迫时间的延长,离子渗漏和MDA含量均呈上升趋势,40d时0.30%及以上浓度的NaCl处理水平相对电导率均>50%,MDA含量显著高于低浓度处理;POD和SOD活性随胁迫时间的延长呈先升后降规律,40d时0.20%NaCl处理的POD活性最高,0.30%NaCl处理的SOD活性最高;游离脯氨酸和可溶性蛋白等渗透调节物质也呈先升后降规律,40d时0.30%及以上浓度的NaCl处理的可溶性蛋白和游离脯氨酸含量显著下降,0.20%及以下浓度的NaCl处理则继续上升。综合上述生理指标的反应,土壤含盐量0.30%及以上时不适合该竹种生长。
A pot experiment was conducted with 2-year-old Guadua amplexifolia to study its NaCl tolerance. The results indicated that NaCl stress had significant effects on the physiological and biochemical characteristics of the plant. The salt injury was divided into 3 degrees, based on the leaf-abscission rate after 40-days exposure, i. e. , non-injury （ 〈 10% ）, mild injury （ 10%- 50% ） , and serious injury （ 〉 50% ）. The ion leakage and MDA content increased considerably over time, the relative conductivity of the plant exposed to 0. 30% and higher salinity for 40 days was 〉 50%, and the MDA content was higher than that at lower salinity. Both POD and SOD activities increased in the early days and then decreased with extended NaCl exposure. On the 40th day exposure, POD activity was the highest at 0. 20% NaCl, while SOD activity was the highest at 0. 30% NaCl. Osmoregulation substance such as free proline and soluble protein had the same trend. After 40 days exposure, the contents of free proline and soluble protein kept increasing in the plants exposed to 0. 20% and lower salinity, while kept decreasing in those exposed to 0. 30% and higher salinity. In summary, 0. 30% and higher soil salinity was not suitable for the growth of G. amplexifolia.
出处
《生态学杂志》
CAS
CSCD
北大核心
2008年第9期1487-1491,共5页
Chinese Journal of Ecology
基金
国家林业局“948”项目“优良速生竹种引进”(2000-04-16)
关键词
瓜多竹
NACL胁迫
酶活性
膜透性
渗透调节物质
Guadua amplexifolia
NaCl stress
enzyme activity
membrane permeability
osmoregulation substance.
