物理坚果植物在低磷酸盐利用率条件下表现出高度的菌根依赖性

E. L. Balota, Oswaldo Machineski, Priscila Viviane Truber, A. Scherer, F. S. D. Souza
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引用次数: 21

摘要

麻疯树(Jatropha curcas L.)是一种多年生树木,自然生长在巴西的热带和亚热带地区。物理坚果的果实在干重基础上的含油量为28%。虽然植物已经适应了不同的土壤条件,如低肥力,但土壤酸度的校正和肥料的添加对高产植物是必不可少的。因此,物理坚果对不同土壤磷水平(P)和丛枝菌根真菌(AMF)接种的响应必须表征。因此,本研究的目的是评价物理坚果幼苗对不同土壤磷水平下丛枝菌根真菌(AMF)接种的响应。试验在温室中进行,包括AMF处理(接种margarita Gigaspora或Glomus clarum,以及未接种的对照)和磷处理(土壤添加0、25、50、100、200和400 mg kg-1)。在低磷水平下,接种丛枝菌根真菌对植株生长、茎部和根系干物质含量、株高、叶片数、总叶面积、单叶叶面积和Dickson品质指数均有显著的正影响。根冠比和叶面积比也受菌根接种和磷添加水平的影响。物理坚果在土壤磷添加量高达50 mg kg-1时表现出高度的菌根依赖性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Physic nut plants present high mycorrhizal dependency under conditions of low phosphate availability
The physic nut (Jatropha curcas L.) is a perennial tree that occurs naturally in the tropical and subtropical regions of Brazil. Fruits of physic nut present an oil content of 28% on a dry weight basis. Although the plant has adapted to diverse soil conditions such as low fertility, the correction of soil acidity and the addition of fertilizer are essential for highly productive plants. Thus, the response of the physic nut to different soil phosphorus levels (P) and arbuscular mycorrhizal fungi (AMF) inoculation must be characterized. Hence, the objective of the present study was to evaluate the response of physic nut seedlings to arbuscular mycorrhizal fungi (AMF) inoculation at different levels of soil P. Experiment was carried out in a greenhouse encompassing AMF treatments (inoculation with Gigaspora margarita or Glomus clarum, and the non inoculated controls), and phosphorus treatments (0, 25, 50, 100, 200 and 400 mg kg-1 added to soil). At low soil P levels, arbuscular mycorrhizal fungi inoculation had a significant positive effect on plant growth, shoot and root dry matter content, plant height, number of leaves, total leaf area, leaf area per leaf and the Dickson quality index. The root:shoot ratio and the leaf area ratio were also affected by mycorrhizal inoculation and the level of P addition. Physic nut plants exhibited high mycorrhizal dependency at soil P additions up to 50 mg kg-1.
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