泡桐耐旱性与膜脂肪酸饱和度关系的研究

Study on the Relationship between Degree of Salurated Fatty Acid in Cell Membrane and Drought Resistant of Paulownia

泡桐属树木在土壤水分胁迫下，复水可以降低膜脂肪酸饱和度，土壤水势从－２．０×１０５Ｐａ提高到－５．０×１０４Ｐａ，使叶片膜脂肪酸饱和度降低了２．０４％。敏感品种（南方泡桐，台湾泡桐）脂肪酸饱和度比耐旱品种（兰考泡桐，楸叶泡桐）低７．７４％，且油酸和硬脂酸含量存在较大差异。脂肪酸饱和度（ＤＳＦＡ）与叶片持水力成正相关。

Fatty acid components in cell membrane in paulownia mainly include∶palmitic acid,linoleic acid,flax acid(about 87% of total fatty acid) and some palmmoleic acid,stearic acid and oleic acid. DSFA was decreased by watering when there is light water stress in soil.And the DSFA is decreased by 2.04% when soil potential increased from -2.0 bar to -0.5 bar.The DSFA difference existed in the membrane between sensitive species and drought resistant species,and there is a slight difference in content of stearic acid and oil acid. DSFA is positively related with Mrc ,and nagativly with SDW and Pm .