| 十二种地卷目地衣固氮活性的种间差异 |
| Differences in N-fixing activities among 12 species in the lichen order Peltigerales |
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| 中文关键词:地衣型真菌，乙炔还原法，胶衣属，猫耳衣属，地卷属 |
| 英文关键词:lichenized fungi, acetylene reduction assay, Collema, Leptogium, Peltigera |
| 基金项目:国家自然科学基金（No. 31000239）；河北省自然科学基金（No. C2010000268） |
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| 中文摘要: |
| 地卷目地衣是对许多生态系统的氮素循环具有重要影响的固氮类群，但其固氮活性的种间差异研究甚少。将不同产地和不同馆藏时间的12种地卷目地衣于相同条件下培养，即：亚石胶衣Collema subflaccidum、亚黑胶衣C. subnigrescens、坚韧胶衣C. tenax、裸果猫耳衣Leptogium hildenbrandii、猫耳衣L. menziesii、柄猫耳衣L. pedicellatum、土星猫耳衣L. saturninum、黑猫耳衣L. trichophorum、犬地卷Peltigera canina、分指地卷P. didactyla、裂芽地卷P. praetextata和地卷P. rufescens。以乙炔还原法（acetylene reduction assay）于培养1d、10d和15d测定其固氮活性，结果显示所有地衣的固氮活性在培养10d与15d之间差异不显著，表明经过至多10d的培养后地衣固氮活性即可完全恢复；培养10d和15d的固氮活性平均值表现出显著的种间差异（P＜0.001）：黑猫耳衣Leptogium trichophorum固氮活性最高[（4.532±0.368）μmol C2H4/gdw·h]，约为犬地卷Peltigera canina的2倍[（2.349±0.223）μmol C2H4/gdw·h]；其他10种地衣固氮活性大致相近。显示地衣固氮作用的可塑性较大，是地衣具有较强适应能力的又一例证。 |
| 英文摘要: |
| The order Peltigerales is an important group of N-fixing lichens that are essential for ecosystem N cycling in many terrestrial ecosystems. But differences in N-fixing activity among species are not well understood at present. Twelve peltigeralean species collected in different localities and subjected to various desiccation durations, namely Collema subflaccidum, C. subnigrescens, C. tenax, Leptogium hildenbrandii, L. menziesii, L. pedicellatum, L. saturninum, L. trichophorum, Peltigera canina, P. didactyla, P. praetextata and P. rufescens, were cultured in the same condition. N-fixing activity was measured using acetylene reduction assay after 1d, 10d and 15d cultivation. No significant differences in N-fixing activity for all lichens were found between 10d and 15d cultivation, suggesting N-fixing activity for lichens was fully recovered after 10d cultivation. A significant difference in N-fixing activity among species was found in terms of mean N-fixing activity averaged over 10d and 15d cultivations (P<0.001), with the highest value for Leptogium trichophorum [(4.532±0.368)μmol C2H4/gdw·h] which is about 2 times higher than that for Peltigera canina [(2.349±0.223)μmol C2H4/gdw·h]. N-fixing activity of the other 10 lichens was roughly similar (2.635－3.379μmol C2H4/gdw·h). These results show lichens have high N fixation plasticity, which can be an evidence for the adaption of lichens to fluctuating environment conditions. |
| 吴清凤,刘华杰,王慧燕. 十二种地卷目地衣固氮活性的种间差异[J]. 菌物学报, 2011, 30(4): 612-617 |
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