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Flooding‐tolerant legume symbioses from the Brazilian Pantanal
Author(s) -
James EuaN. K.,
Loureiro M. de Fatima,
Pott Arnildo,
Pott ValI. J.,
Martins Claudia M.,
Franco Avilio A.,
Sprent Janet I.
Publication year - 2001
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1046/j.1469-8137.2001.00126.x
Subject(s) - biology , botany , habit , aerenchyma , agronomy , psychology , psychotherapist
Summary• Nodulated legumes in some of the flooded and seasonally flooded areas of the Pantanal Mato‐Grossense wetlands in Brazil are described here. • In the permanently flooded lakes (baias) of the Caracara national park Discolobium pulchellum , Mimosa pellita , Sesbania exasperata and Vigna lasiocarpa (syn. Phaseolus pilosus ) were the most abundant, whereas close to Corumbá, at the edges of the river Paraguai, Neptunia spp. were also common. Adaptations that allow these legumes to fix N 2 in a flooded environment included a floating growth habit, aerenchyma and nodulated adventitious roots. • By contrast, Aeschynomene spp. ( A. ciliata , A. denticulata , A. fluminensis , and A. sensitiva ) were the dominant nodulated legumes in the seasonally flooded pastures of Nhumirim. • Stem‐nodulation was commonly observed, particularly on seasonally flooded Aeschynomene and seasonal/permanently flooded Discolobium spp., but also, in a modified form, on floating stems of V. lasiocarpa . The structures of stem and/or root nodules on Aeschynomene spp., Discolobium leptophyllum and V. lasiocarpa are described in detail, and nodulation by D. leptophyllum and Neptunia pubescens is reported for the first time.