两种盐生植物幼苗在NaCl处理下对昼夜温差变化的叶绿素荧光响应

摘要/Abstract

摘要： 以囊果碱蓬(Suaeda physophora Pall.)、梭梭(Haloxylon ammodendron (C.A.Mey.) Bunge)两种植物幼苗为实验材料,研究了不同NaCl浓度处理下,一次昼夜温差（温差为27 ℃）变化对两种植物幼苗叶绿素荧光参数变化的影响。结果表明:①在NaCl胁迫下,同期囊果碱蓬的PSⅡ潜在活性Fv/Fo和最大光化学量子产量Fv/Fm降低幅度较小,而梭梭则有较明显降低,而且囊果碱蓬显著高于后者;同期光合量子产量Yield和表观光合电子传递速率ETR均以囊果碱蓬最大并显著高于梭梭,说明囊果碱蓬较梭梭具有强的对盐分和较大的昼夜温差变化的忍耐能力,其机体在盐分和较大昼夜温差变化下,并未受到较大的损伤,而梭梭的光合器官在相同的条件下却受到了较大的损伤,证明了囊果碱蓬更适合生长于同时具有盐渍和较大昼夜温差的地区。②通过实验发现梭梭的Yield值和ETR值到下午基本上能恢复到早上的水平,说明了其在前期的胁迫条件下,虽然光合器官上受到了破坏,但仍然能够通过光合调节适应环境的变化,以保持机体的活性。③囊果碱蓬在本实验条件下,光合器官虽然没有受到损伤,但200 mmol\5L-1 NaCl抑制了其光合能力。

关键词: 盐分胁迫, 昼夜温差, 叶绿素荧光, 囊果碱蓬, 梭梭

Abstract: The effects of NaCl and day-night temperature difference on chlorophyll fluorescence parameters for two halophytes species, Suaeda physophora Pall., Haloxylon ammodendron(C.A.Mey.) Bunge,which distributed in Northwestern China, were investigated. The results showed that: (1) the value of Fv/Fo, Fv/Fm reduced quite slightly in S. physophora but quite obviously in H. ammodendron. The maximum value of Yield, ETR were all observed in S. physophora. It showed that the S. physophora had a stronger ability to resist the impacts of NaCl and day-night temperature difference than H. ammodendron. It suggested that S. physophora seemed to be more suitable to grow in the area with NaCl and day night temperature difference. (2) It also showed that the the value of Yield and ETR in H. ammodendron could recovery in the afternoon. It suggested that although the organs were destroyed in the pre-stress conditions, they still were able to adapt to the environment through photosynthesis regulation, in order to maintain the activity of plants. (3) Under this experimental conditions, although there was no damage on the plants of S. physophora, 200 mmol\5L-1 NaCl had restrained its photosynthetic capacity.

Key words: salt stress, day night temperature difference, chlorophyll fluorescence, Suaeda physophora, Haloxylon ammodendron

中图分类号:

Q945.78

韩张雄;李利*;徐新文;吕湘芳. 两种盐生植物幼苗在NaCl处理下对昼夜温差变化的叶绿素荧光响应[J]. 中国沙漠, 2010, 30(1): 63-68.

HAN Zhang-xiong;LI Li;XU Xin-wen;LV Xiang-fang. Response of Chlorophyll Fluorescence Paramenters to Day-Night Temperature Difference in Two Halophytes under NaCl Treatment[J]. JOURNAL OF DESERT RESEARCH, 2010, 30(1): 63-68.

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