外源5-氨基乙酰丙酸对NaCl胁迫下酸枣光合特性的影响

以2年生酸枣幼苗为试验材料,探讨不同浓度NaCl(0、4、8、12g·kg-1)胁迫下喷施5-氨基乙酰丙酸(ALA,75、150mg·L~(-1))对酸枣光合特性的影响。结果显示:(1)不同浓度NaCl胁迫下,外源ALA对酸枣叶片的净光合速率(Pn)、胞间二氧化碳浓度(Ci)、气孔导度(Gs)、蒸腾速率(Tr)及叶绿素含量等具有明显促进作用。(2)在不同浓度NaCl胁迫下,喷施75mg·L~(-1)的ALA仅在NaCl浓度为4和8g·kg-1处理下对酸枣Tr值具有显著提高作用,而喷施150mg·L~(-1) ALA在各NaCl浓度胁迫下对其Pn、Ci和Tr均具有显著促进作用。(3)在重度NaCl胁迫(12g·kg-1)下,喷施150mg·L~(-1) ALA对酸枣叶片叶绿素含量具有显著提高作用,而喷施75mg·L~(-1)浓度ALA却无明显提高。研究表明,在NaCl胁迫条件下,外源ALA能有效改善酸枣叶片光合气体交换参数,提高叶绿素含量,从而缓解NaCl胁迫的伤害,提高其光合能力,并以喷施150mg·L~(-1) ALA的缓解效果更好。

Foliar Spray of 5 aminolevulinic Acid on Photosynthetic Characteristics of Wild Jujube under NaCl Stress

The objective of this study was to survey the photosynthetic characteristics of wild jujube under different NaCl stress(0, 4, 8 and 12 g·kg^-1)with exogenous different ALA concentrations (75 and 150 mg·L^-1). The results showed that: (1) the exogenous ALA increased net photosynthetic rate (P_n), intercellular carbon dioxide concentration (C_i), stomata conductance (G_s) and chlorophyll content significantly under the treatments with the different NaCl treatments. (2) Under the different NaCl treatments spraying 75 mg·L^-1 concentrate ALA increased T_r significantly only under 4 g·kg^-1 and 8 g·kg^-1 NaCl concentrate treatments; spraying 150 mg·L^-1 concentrate increased P_n, C_i and T_r significantly. (3) In 12 g·kg^-1 NaCl concentrate treatment, spraying 150 mg·L^-1 concentrate ALA increased chlorophyll content significantly, but spraying 75 mg·L^-1 concentrate ALA had no significant effect on chlorophyll content. It showed that under the NaCl stress, exogenous ALA can improve wild jujube leaves photosynthetic gas exchange parameters, increase chlorophyll content to relieve the NaCl stress and improve photosynthetic capacity, and spraying 150 mg·L^-1 concentrate ALA had better effect to relieve the NaCl stress.