THE ROLE OF PROTEINS IN THE NITROGEN NUTRITION OF ECTOMYCORRHIZAL PLANTS .2. UTILIZATION OF PROTEIN BY MYCORRHIZAL PLANTS OF PINUS-CONTORTA
THE ROLE OF PROTEINS IN THE NITROGEN NUTRITION OF ECTOMYCORRHIZAL PLANTS .2. UTILIZATION OF PROTEIN BY MYCORRHIZAL PLANTS OF PINUS-CONTORTA
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DOI：
10.1111/j.1469-8137.1986.tb02887.x
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发表时间：
1986-07-01
期刊：
影响因子：
9.4
通讯作者：
READ, DJ
中科院分区：
文献类型：
--
作者：
ABUZINADAH, RA;FINLAY, RD;READ, DJ
研究了弯松菌根(M)和非菌根（NM）植株的生长能力。研究了利用蛋白质作为氮源的方法。以真菌共生体珙桐Paxillus involutus、玫瑰根瘤菌rhizopogus、牛毛菌Suillus bovinus和Pisolithus tinctorius为原料合成菌根。这些植物在无菌条件下生长，并以蛋白质或铵的形式提供氮。以蛋白质为氮源时，侵染天竺云、玫瑰红天竺云和牛天竺云的植株干重产量显著高于NM植株。在这些组合中，M植株在蛋白质上的产量与在氨氮上的产量相似。非菌根植物对蛋白N的利用能力较弱，染红假单胞菌感染的植物对蛋白N的利用能力也较弱。在那些产量增加的组合中，植株也含有大量的氮。计算表明，在所有这些情况下，氮含量的一些增加是通过利用蛋白质引起的。讨论了研究结果与植物氮素营养和土壤氮素动员模式的关系。结果表明，菌根结合利用蛋白质N的能力不仅会增加植物的N供应，而且还会与分解者群体更有效地竞争，并导致氮循环的整体收紧。
The ability of mycorrhizal (M) and nonmycorrhizal (NM) plants of Pinus contorta (Dougl. ex Loud) to utilize protein as a nitrogen source was examined. Mycorrhizas were synthesized with the fungal symbionts Paxillus involutus, Rhizopogon roseolus, Suillus bovinus and Pisolithus tinctorius. The plants were grown under asepetic conditions and provided with nitrogen in the form of either protein or ammonium. Dry weight yields of plants infected with P. involutus, R. roseolus and S. bovius were significantly higher than those of NM plants when grown on protein as the N source. In these associations yields of M plants on protein were similar to those obtained on ammonium-N. Non-mycorrhizal plants had little ability to use protein N and the same was true of plants infected with P. tinctorius. Plants in those associations which provided a yield increase also contained larger quantities of N. Calculations show that in all these cases some of the increases of N content arise through utilization of protein. The implication of the results are discussed in relation to the nitrogen nutrition of the plant and to the pattern of N mobilization in soil. It is proposed that the ability of mycorrhizal associations to utilize protein N will lead not only to an increased supply of N to the plant but also to more effective competition with the decomposer population and to an overall tightening of the nitrogen cycle.