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多胺会改变地衣对氮胁迫的敏感性吗?

Do polyamines alter the sensitivity of lichens to nitrogen stress?

作者信息

Pirintsos S A, Munzi S, Loppi S, Kotzabasis K

机构信息

Department of Biology, University of Crete, Heraklion, Greece.

出版信息

Ecotoxicol Environ Saf. 2009 Jul;72(5):1331-6. doi: 10.1016/j.ecoenv.2009.03.001. Epub 2009 Apr 18.

Abstract

The sensitivity of lichens measuring photosynthetic efficiency and polyamines as modulator of nitrogen stress tolerance was investigated. Two lichen species with a markedly different tolerance to nitrogen compounds, namely Evernia prunastri (L.) Ach. and Xanthoria parietina (L.) Th.Fr., were incubated with deionized water (control) and solutions of KNO(3), NH(4)NO(3) and (NH(4))(2)SO(4) and then exposed to different light conditions. The F(v)/F(m) parameter (maximum quantum efficiency of photosystem II) was used as stress indicator. The results showed that F(v)/F(m) values, in the produced experimental conditions, were independent from the light gradient. Photosynthetic efficiency of E. prunastri was impaired by high ammonium concentrations, while nitrate had no effect; X. parietina was hardly influenced by nitrogen compounds. External supply of polyamines reduced the sensitivity of E. prunastri, while polyamine inhibitors reduced the tolerance of X. parietina to NH(4)(+), suggesting that polyamines play an important role in modulating the sensitivity/tolerance to nitrogen stress.

摘要

研究了地衣测量光合效率以及多胺作为氮胁迫耐受性调节剂的敏感性。将两种对氮化合物耐受性明显不同的地衣物种,即扁枝衣(Evernia prunastri (L.) Ach.)和石黄衣(Xanthoria parietina (L.) Th.Fr.),分别用去离子水(对照)以及硝酸钾、硝酸铵和硫酸铵溶液进行培养,然后置于不同光照条件下。使用F(v)/F(m)参数(光系统II的最大量子效率)作为胁迫指标。结果表明,在所产生的实验条件下,F(v)/F(m)值与光照梯度无关。高铵浓度会损害扁枝衣的光合效率,而硝酸盐则无影响;石黄衣几乎不受氮化合物的影响。外源供应多胺降低了扁枝衣的敏感性,而多胺抑制剂则降低了石黄衣对铵离子的耐受性,这表明多胺在调节对氮胁迫的敏感性/耐受性方面发挥着重要作用。

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