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Effects of climatic factors on native arbuscular mycorrhizae and Meloidogyne exigua in a Brazilian rubber tree (Hevea brasiliensis) plantation by Schwob; Ducher; Coudret is a Agricultural and Biological Sciences article available to read on EtoBox.

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The root‐knot nematode __Meloidogyne exigua__ and arbuscular mycorrhizal (AM) fungi may both occur in the roots of Brazilian rubber trees (__Hevea brasiliensis__). AM fungi may stimulate plant growth whereas nematodes usually reduce it. Variations of native AM fungi and __M. exigua__ populations in soil and roots of rubber trees were studied for one year in a Brazilian plantation. The number of AM spores in the soil was generally greater in the rainy season than in the dry season, although AM colonization of roots was unaffected by season. During the dry season, numbers of juveniles and eggs of __M. exigua__ in roots were lower than in the rainy season. A site without nematodes in the soil or roots showed the greatest numbers of AM spores in soil and highest AM colonization of roots. A negative correlation was observed between the percentage of AM colonization and the number of second‐stage juveniles in soil and second‐stage juveniles and eggs in roots. Microscope observations revealed (i) tissue specificity for each of the microorganisms in the roots, with a cortical location of mycorrhizae and a mainly vascular cylinder location of nematodes, and (ii) that __Gigaspora__ was the m

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Author

Schwob; Ducher; Coudret

Publisher

John Wiley and Sons; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Wiley (ISSN 0032-0862)

Published

1999

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)