Rabie G H
Botany Department, Faculty of Science, Zagazig University, Zagazig, Egypt.
Mycorrhiza. 2005 May;15(3):225-30. doi: 10.1007/s00572-004-0345-y. Epub 2005 Mar 12.
Increasing use of saline water in irrigation can markedly change the physical and chemical properties of soil. An experiment was carried out to investigate the interaction between the mycorrhizal fungus Glomus clarum, isolated from a saline soil, and kinetin on the growth and physiology of mungbean plants irrigated with different dilutions of seawater (0, 10, 20, and 30%). The growth, chlorophyll concentration and sugar content of mycorrhizal plants was greater than that of non-mycorrhizal plants under all conditions (with or without seawater). The dry weight of both mycorrhizal and non-mycorrhizal mungbean plants irrigated with 10% seawater was significantly increased by treatment with kinetin. The mycorrhizal symbiosis increased root:shoot dry weight ratio, concentrations of N, P, K, Ca and Mg, plant height, protein content, nitrogen or phosphorus-use efficiencies, and root nitrogenase, acid or alkaline phosphatase activities of seawater-irrigated mungbean plants, with little or no effect of kinetin. Kinetin treatment generally decreased chlorophyll concentration and sugar content in mycorrhizal plants as well as Na/N, Na/P Na/K, Na/Ca and Na/Mg ratios. Root colonization by G. clarum was increased by irrigation with seawater, and kinetin had no consistent effect on fungal development in roots. This study provides evidence that arbuscular mycorrhiza can be much more effective than kinetin applications in protecting mungbean plants against the detrimental effects of salt water.
灌溉中盐水使用量的增加会显著改变土壤的物理和化学性质。开展了一项实验，以研究从盐渍土中分离出的菌根真菌明球囊霉（Glomus clarum）与激动素对用不同稀释度海水（0%、10%、20%和30%）灌溉的绿豆植株生长和生理的相互作用。在所有条件下（有或没有海水），菌根植株的生长、叶绿素浓度和糖分含量均高于非菌根植株。用激动素处理显著增加了用10%海水灌溉的菌根和非菌根绿豆植株的干重。菌根共生提高了海水灌溉的绿豆植株的根干重与地上部干重比、氮、磷、钾、钙和镁的浓度、株高、蛋白质含量、氮或磷利用效率以及根固氮酶、酸性或碱性磷酸酶活性，激动素对此影响很小或没有影响。激动素处理通常会降低菌根植株中的叶绿素浓度和糖分含量以及钠/氮、钠/磷、钠/钾、钠/钙和钠/镁比率。海水灌溉增加了明球囊霉在根部的定殖，激动素对根部真菌发育没有一致的影响。这项研究提供了证据，表明丛枝菌根在保护绿豆植株免受盐水的有害影响方面比施用激动素更有效。
