New Records of Tropical Legume Nodulation

Dubey, H. D.; Woodbury, R.; Rodríguez, Rita L.

doi:10.1086/336610

Cited by 3 publications

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“…However, V. lasiocarpa differs from V. longifolia in having hairy pods, and also in that the latter usually grows only in seasonally flooded or dry areas . Interestingly, V. longifolia is also found in other wetland regions of South and Central America, such as the humid Chaco of Paraguay (Hacker et al, 1996) and in 'permanently wet' locations in Puerto Rico (Dubey et al, 1972).…”

Section: Resultsmentioning

confidence: 99%

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Flooding‐tolerant legume symbioses from the Brazilian Pantanal

et al. 2001

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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.

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Section: Resultsmentioning

confidence: 99%

“…Interestingly, V. longifolia is also found in other wetland regions of South and Central America, such as the humid Chaco of Paraguay (Hacker et al. , 1996) and in ‘permanently wet’ locations in Puerto Rico (Dubey et al. , 1972).…”

Section: Resultsmentioning

confidence: 99%

Flooding‐tolerant legume symbioses from the Brazilian Pantanal

et al. 2001

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Symbiotic functioning, structural adaptation, and subcellular organization of root nodules from Psoralea pinnata (L.) plants grown naturally under wetland and upland conditions in the Cape Fynbos of South Africa

Kanu

Dakora

2015

Protoplasma

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In the Cape Fynbos of South Africa, Psoralea pinnata (L.) plants occur naturally in both wetland and well-drained soils and yet effectively fix N under the two contrasting conditions. In this study, nodule structure and functioning in P. pinnata plants from the two habitats were evaluated using light and transmission electron microscopy (TEM), as well as the N natural abundance technique. The results showed that, structurally, fully developed P. pinnata nodules were spherical in shape with six components (namely, lenticels, periderm, outer cortex, middle cortex, inner cortex, and a central bacteria-infected medulla region). Morphometric analysis revealed 44 and 84 % increase in cell area and volume of wetland nodules compared to those from upland. The percentage area of nodules occupied by the middle cortex in wetland nodules was twice that of upland nodules. As a result, the size of the medulla region in wetland nodules was significantly reduced compared to upland nodules. Additionally, the average area of medulla occupied by intercellular air spaces in wetland nodules was about five times that of upland nodules (about 431 % increase in wetland over upland nodules). TEM data also showed more bacteroids in symbiosomes of upland nodules when compared to wetland nodules. However, isotopic analysis of above-ground plant parts revealed no differences in symbiotic parameters such as N concentration, ∂N and %Ndfa between wetland and upland P. pinnata plants. These results suggest that, under limiting O conditions especially in wetlands, nodules make structural and functional adjustments to meet the O demands of N-fixing bacteroids.

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Systematics ofVignasubgenusLasiospron(Leguminosae: Papilionoideae: Phaseolinae)

et al. 2022

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Abstract— A taxonomic treatment is herein provided for the six primarily Neotropical species of Vigna subg. Lasiospron. This subgenus is distinguished, in part, by its close relationship with Old World Vigna species, but rather than having an Old World Vigna floral asymmetry where distal floral parts can have a right-hand curvature (from a face-view perspective), distal parts of Vigna subg. Lasiospron flowers, like those of American Phaseolinae, curve to the left. Our proposed taxonomy reflects published phylogenetic analyses that resolve the Vigna subg. Lasiospron species in a subclade of the primarily Old World clade of species of Vigna sensu stricto. Vigna subg. Lasiospron is therefore distinctive in having a primarily neotropical distribution. Three of the six Vigna subg. Lasiospron species have an amphi-Atlantic distribution, which we suggest was achieved naturally by the ability of these species to disperse and colonize coastal habitats. Nomenclatural and taxonomic synonyms are reported, along with species descriptions and the biogeographical, genetic, and morphological evidence that argues for each of the six Vigna subg. Lasiospron species fitting a unified species concept.

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New Records of Tropical Legume Nodulation

Cited by 3 publications

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Flooding‐tolerant legume symbioses from the Brazilian Pantanal

Flooding‐tolerant legume symbioses from the Brazilian Pantanal

Symbiotic functioning, structural adaptation, and subcellular organization of root nodules from Psoralea pinnata (L.) plants grown naturally under wetland and upland conditions in the Cape Fynbos of South Africa

Systematics ofVignasubgenusLasiospron(Leguminosae: Papilionoideae: Phaseolinae)

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