Morphological pattern of colonization by mycorrhizal fungi and the microbial activity observed in Barbados cherry crops

ABSTRACT: Our objective was to evaluate the morphological pattern of colonization by arbuscular mycorrhizal fungi (AMF) as well as to study the microbiological activity of the soil on family farms where Barbados cherry was cultivated. Soil and root samples were selected from four areas in the municipality of Maranguape-CE where Barbados cherry was grown, which were named according to the age of plants in the following manner: A1-3, A2-3, and A3-3 (3 years), and A4-2 (2 years). After sampling, the arbuscular mycorrhizal colonization, morphological colonization pattern, basal soil respiration (SBR), and density of mycorrhizal spores (DS) were analyzed. The Paris-type morphological pattern was predominant in the root system of Barbados cherry; the affinity of this pattern in the culture was clear. Time of installation and management of Barbados cherry orchards in family farming areas promoted reduction in SBR. P levels in the soil may have negatively influenced root colonization and density of mycorrhizal spores.

摘要：本研究旨在评估丛枝菌根真菌（arbuscular mycorrhizal fungi, AMF）的定殖形态模式，并探究种植西印度樱桃的家庭农场土壤的微生物活性。研究人员从巴西塞阿拉州马拉瓜佩市（Maranguape-CE）的4处西印度樱桃种植区域采集土壤与根系样品，依据植株种植年限将其命名为：A1-3、A2-3、A3-3（均为定植3年）以及A4-2（定植2年）。采样完成后，对丛枝菌根定殖率、定殖形态模式、基础土壤呼吸（basal soil respiration, SBR）以及菌根孢子密度（mycorrhizal spore density, DS）开展了分析检测。结果表明，西印度樱桃根系中以巴黎型（Paris-type）丛枝菌根定殖形态为主，该类型在种植体系中的适配性十分明确。家庭农场中西印度樱桃果园的定植时长与管理模式，可促使基础土壤呼吸水平降低。土壤中的磷素水平可能对根系定殖以及菌根孢子密度产生了负面影响。