盐胁迫下苹果砧木光合能力及光合色素的变化

用NaCl型盐渍土浸提液对一年生盆栽Luo－1、Luo－2、小金海棠（Malus toringoides var． xiaojin．）、平邑甜茶（M． hupehensis Rehd．）实生苗进行盐胁迫处理，测定盐胁迫下光合能力和色素变化，结果表明：苹果砧木光合能力下降幅度越小、叶绿素a、b含量及对照比变化越小，耐盐能力越高，但这一现象只有在高盐浓度下才明显；耐盐能力强的Luo－2光合能力随盐处理时间的延长始终较为稳定，耐盐能力弱的苹果砧木在高盐度下则表现明显的下降趋势。

Change of Photosynthetic Capability and Pigment Content of Apple Rootstocks Under Salt-Stress

The photosynthetic capability and pigment content of one－year－old potted apple rootstocks such as Luo－1， Luo－2， Malus toringoides var． xiaojin， M． hupehensis Rehd． under the salt stress with salt solution extracted from NaCl－typed salt soil were measured． The less declining extent of their photosynthetic capability， the content and the ratio of sample with control blank of Chl a and Chl b， the more salt tolerance of apple rootstocks， but this phenomenon was only evident when treated with higher salinity． The photosynthetic capability of the rootstock Luo－2 which has higher salt tolerance ability was relatively stable， however， the others with lower salt tolerance appeared obvious down trend under higher salinity．