Jagdale Ganpati B, Brenneman Timothy B, Severns Paul M, Shapiro-Ilan David
Extension Nematology Lab, Department of Plant Pathology, University of Georgia, 2350 College Station Road, Athens, GA, 30602.
Department of Plant Pathology, University of Georgia, 2360 Rainwater Rd., Tifton, GA, 31793-5766.
J Nematol. 2021 Sep 7;53. doi: 10.21307/jofnem-2021-075. eCollection 2021.
In Georgia, pecans are commercially grown in the Piedmont and Coastal Plain ecoregions which are characterized by sandy-loam, sandy, and/or clay soils. If well-drained, these soils are suitable for pecan production, but the soil characteristics differ enough between ecoregions in which the plant-parasitic nematode (PPN) communities could differ substantially. We studied PPN communities in pecan orchards to evaluate the potential for ecoregion differences. In total, 11 genera (, , , , , , , , , , ) were recovered from pecan orchards in the Piedmont and Coastal Plain ecoregions. However, Non-Metric Multi-Dimensional Scaling ordination, Multi-Rank Permutation Procedure, and Indicator Species Analyses indicated that the pecan PPN communities strongly differed between ecoregions and that different genera were strongly associated with different ecoregions. For 9 of the 11 PPN genera, the maximum counts occurred in Coastal Plain locations, suggesting that the well-drained sandy soils of the Coastal Plain and comparatively ill-drained red clay soils of the Piedmont may be conducive and unfavorable for movement/reproduction of PPNs, respectively.
在佐治亚州，山核桃在皮埃蒙特和沿海平原生态区进行商业化种植，这些地区的土壤以砂壤土、砂土和/或黏土为主。如果排水良好，这些土壤适合山核桃生产，但不同生态区的土壤特性差异较大，植物寄生线虫（PPN）群落可能也会有很大不同。我们研究了山核桃果园中的PPN群落，以评估生态区差异的可能性。总共从皮埃蒙特和沿海平原生态区的山核桃果园中发现了11个属（，，，，，，，，，，）。然而，非度量多维尺度排序、多秩置换程序和指示物种分析表明，山核桃PPN群落在不同生态区之间存在显著差异，不同属与不同生态区密切相关。在11个PPN属中的9个属中，最高数量出现在沿海平原地区，这表明沿海平原排水良好的砂质土壤和皮埃蒙特排水相对较差的红黏土分别可能有利于和不利于PPN的移动/繁殖。
