渗透胁迫下两种生物质能源植物的抗渗透胁迫能力及稳定碳同位素组成

本研究以麻疯树(Jatropha curcas L.)和油桐(Vernicia fordii H.)幼苗为材料,考察了麻疯树和油桐幼苗的生理指标和稳定碳同位素组成对渗透胁迫的响应情况。结果表明,麻疯树比油桐更具有抗渗透胁迫能力,主要体现在:随着渗透胁迫程度的加剧,麻疯树叶片相对含水量与叶绿素含量的下降幅度均小于油桐,脯氨酸含量和可溶性糖含量的增加幅度高于油桐,相对电导率的上升幅度小于油桐;随着渗透胁迫程度的加剧,两种植物幼苗叶片的δ13 C值也都显著升高,但是在同一渗透胁迫水平下,麻疯树幼苗叶片的δ13 C值较油桐高,表明其拥有较高的水分利用效率,能够在干旱胁迫下更好地生长,暗示着植物叶片的δ13 C值在一定情况下可以表征植物的抗旱性。

Resistance and Stable Carbon Isotopic Composition of Two Species of Biomass Plants under Osmotic Stress

In the present study,the response of physiological parameters and stable carbon isotopic composition in Jatropha curcas L.and Vernicia fordii H.to osmotic stress was investigated and analyzed.Jatropha curcas had a better osmotic stress resistant ability than Vernicia fordii.As osmotic stress increased,Jatropha curcas had a lower decrease in leaf relative water content and chlorophyll content,higher increase in proline content and soluble sugar content,besides,it had a lower increase in relative electric conductivity;As osmotic stress increased,δ13C values of the two plants increased significantly,but under the same osmotic stress level,δ13C in Jatropha curcus was higher than Vernicia fordii,indicated that Jatropha curcus had a higher water use efficiency,and could grow better under drought stress conditions.It implied that δ13C value of leaves could reflect the drought tolerance of plants under certain conditions.