Nematode abundance and diversity in sugarcane fields in Brazil

• Published in: Tropical plant pathology Vol. 43; no. 6; pp. 485 - 498
• Main Authors: Maranhão, Sandra R. V. L., Pedrosa, Elvira M. R., Guimarães, Lilian M. P., Chaves, Andréa, Leitão, Diego A. H. S., Vicente, Thais F. S.
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01-12-2018; Springer Nature B.V
• Subjects: Abundance; Biomedical and Life Sciences; Bulk density; Climatic conditions; Crop development; Cultivation; Floodplains; Life Sciences; Meloidogyne; Nematodes; Organic chemistry; Organic matter; Original Article; Plant diversity; Plant Pathology; Planting; Porosity; Pratylenchus; Saccharum officinarum; Soil chemistry; Soil conditions; Soil density; Soil porosity; Soils; Sugarcane; Brazil; Edaphic climatic effect; Microbivores; Biomonitoring
• ISSN: 1983-2052; 1982-5676; 1983-2052
• DOI: 10.1007/s40858-018-0253-x

Edaphic climatic conditions directly affect the population dynamics of nematode assemblages and management strategies. The objective of this study was to characterize spatiotemporal changes in nematode abundance and diversity in sugarcane fields of northeastern Brazil under different edaphic climatic conditions. Soil samples from seven geoenvironmental sites under continuous cultivation were taken at planting and 4, 9, and 14 months after planting. Nematode abundance and diversity varied with the soil’s physical and chemical characteristics. Sites in the rainfed and irrigated coastal tables as well the floodplain had higher number of nematodes in contrast to the flat-land and hillside. The abundance of plant-parasitic nematodes increased concurrently with crop development, but the number of taxa decreased.
Meloidogyne
and
Pratylenchus
were the dominant plant-parasitic genera across locations, but bacterivores were dominant in southern sites at field replanting. Heat map delineated two distinct groups of nematode distribution within the geoenvironmental zones, rather than the sampling times.
Pratylenchus
density was high in both groups, but in contrast with
Meloidogyne
and
Criconemella
, the abundance of
Pratylenchus
and
Helicotylenchus
was higher in sites with lower soil bulk density and higher porosity, clay, organic matter, and water contents as those in the southern sites, reflecting edaphic climatic conditions.