THE ROLE OF PROTEINS IN THE NITROGEN NUTRITION OF ECTOMYCORRHIZAL PLANTS .4. THE UTILIZATION OF PEPTIDES BY BIRCH (BETULA-PENDULA L) INFECTED WITH DIFFERENT MYCORRHIZAL FUNGI
THE ROLE OF PROTEINS IN THE NITROGEN NUTRITION OF ECTOMYCORRHIZAL PLANTS .4. THE UTILIZATION OF PEPTIDES BY BIRCH (BETULA-PENDULA L) INFECTED WITH DIFFERENT MYCORRHIZAL FUNGI
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DOI：
10.1111/j.1469-8137.1989.tb00308.x
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发表时间：
1989-05-01
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;READ, DJ
在无菌根的条件下，对白桦（Betula Pendula L.）幼苗进行了无菌培养，并与肌根真菌Hebeloma甲壳状芽孢杆菌（helbeloma甲壳状芽孢杆菌）进行了研究。前圣。它们分别以氨基酸l -丙氨酸、氨基酸l -丙氨酸或2 - 6个丙氨酸单位的肽段作为唯一氮源。以干重、产量和根、芽氮含量为指标，测定了不同种类植物利用这些氮源的能力。而非菌根植物不能利用这些化合物中的任何一种作为氮源，菌根感染为植物提供了一些利用所有氮源的途径。然而，这些真菌在动员氮的程度上是不同的，一般来说，甲壳菌比蕈蕈菌更有效，而蕈蕈菌又比involutus更有效。受感染植株的产量和氮含量通常在多肽处理上高于氨基酸处理，且两种最有效的真菌产量和氮含量均在含有最多多肽单元的处理中获得。讨论了这些观察结果的生理和生态意义，并特别关注了菌根在自然生态系统中植物氮营养中的作用。
Seedlings of Betula Pendula L. were grown aseptically in the non-mycorrhizal condition and in association with the myocorrhizal fungi Hebeloma crustuliniforme (Bull. ex St. Am.) Quel Amanita muscaria (L. ex Fr.) Hooker or Paxillus Involutus (Batsch) Fr. They were supplied with the amino-acid L-alanine, or with the amino acid L-alanine, or with peptides of between 2 and 6 alanine units, as sole nitrogen (N) sources. The ability of the different categories of plants to use these N sources was measured in terms of dry weight yield and nitrogen content of roots and shoots. While non-mycorrhizal plants were unable to use any of these compounds as N sources, mycorrhizal infection provided the plants with some access to all of the N sources. The fungi differed, however, in the extent to which they mobilized the nitrogen, H. crustuliniforme being generally a more effective symbiont than A. muscaria which was, in turn, more effective than P. involutus. The yields and N contents of infected plants were normally higher on the peptides than on the amino acid, and the two most effective fungi, the highest yield and nitrogen content were obtained in the treatments containing the largest peptide units. The physiological and ecological significance of these observations is discussed with particular attention being given to the role of mycorrhizas in the nitrogen nutrition of plants in natural ecosystems.