scholarly journals Distribuição de macrófitas aquáticas numa lagoa na fazenda Nhumirim, Nhecolândia, Pantanal, MS

1989 ◽  
Vol 3 (2 suppl 1) ◽  
pp. 153-168 ◽  
Author(s):  
Vali J Pott ◽  
Norma C Bueno ◽  
Rosana A. C Pereira ◽  
Suzana M. De Salis ◽  
Neuza L Vieira
Keyword(s):  
Pontederia Cordata

A Nhecolândia, uma sub-região arenosa do Pantanal, possui muitas lagoas ("baías") rasas e subcirculares. Levantou-se, em outubro de 1988, através de duas transecções, a vegetação aquática de uma lagoa permanente, denominada "Baía da Sanguessuga", com 250m de diâm. e até 1,2m prof. (época seca), na fazenda Nhumirim (18º59'S e 56º39'W, e alt 90m). As plantas foram coletadas e depositadas nos Herbários CP AP e COR. São apresentadas lista de 37 plantas ocorrentes, suas formas biológicas, e gráficos de frequência das principais espécies. As espécies mais freqüentes são: Utricularia spp., Salvinia auriculata, Cabomba pyauhyensis, Hydrocieis nymphoides, Cyperus cf. polystachyos, Eleocharis spp., Pontederia cordata, Nymphaea amazonwn e Echinodorus spp. Observou-se zonação na distribuição das principais espécies, explicada pela relação entre profundidade e forma biológica das plantas.

Primary vascular patterns in root meristems of Pontederia cordata and their relevance to studies of root development

1980 ◽  
Vol 58 (12) ◽  
pp. 1351-1369 ◽  
Author(s):  
W. A. Charlton
Keyword(s):  
Apical Meristem ◽  
Vascular System ◽  
Root Apex ◽  
Root Apical Meristem ◽  
Vascular Pattern ◽  
Quiescent Centre ◽  
Vascular Differentiation ◽  
Pontederia Cordata ◽  
Distribution Of Components ◽  
Root Apices

There are several files of metaxylem cells in root apices of Pontederia cordata L., each considered to consist of a series of prospective vessels with their ends in contact. Two longitudinally adjacent vessels may be in the same file of cells produced by the root apex or in adjacent files. As the root grows, successive prospective vessels are added to the apical ends of most of the files but not all files are continued. Addition of prospective vessels appears to take place within the "quiescent centre" of the root apical meristem. Where files are not continued there is no immediate readjustment of remaining files. The longitudinal and transverse distribution of components of the vascular system (including protophloem and protoxylem) is discussed in relation to the means by which the pattern of development may be controlled. Rates of production of vessels and the final lengths of the vessels are estimated. The observations and deductions are discussed in relation to other studies of root growth, vascular differentiation, and vascular pattern formation and maintenance.

scholarly journals Levantamento da infestação de plantas aquáticas em Porto Primavera antes do enchimento final do reservatório

2009 ◽  
Vol 27 (spe) ◽  
pp. 879-886 ◽  
Author(s):  
D Martins ◽  
R.A Pitelli ◽  
M.S Tomazella ◽  
R.H Tanaka ◽  
A.C.P Rodrigues
Keyword(s):  
Eichhornia Crassipes ◽  
Pistia Stratiotes ◽  
Alternanthera Philoxeroides ◽  
Typha Angustifolia ◽  
Pontederia Cordata ◽  
Eichhornia Azurea ◽  
Echinochloa Polystachya ◽  
Polygonum Lapathifolium ◽  
Paspalum Repens ◽  
Egeria Najas

O objetivo deste trabalho foi identificar as plantas aquáticas e os níveis de infestação de cada espécie em Porto Primavera antes do enchimento final do reservatório. Foram avaliados todos os focos de vegetação aquática no reservatório (72 pontos), sendo os pontos demarcados com um aparelho de GPS. As espécies foram identificadas e estimouse visualmente (tamanho da área) a distribuição proporcional das plantas no foco de infestação. Após a identificação, foram encontradas 18 espécies de plantas aquáticas vegetando no reservatório, das quais foram determinadas a frequência de espécie de planta aquática e a distribuição dentro do sistema de geração de energia. As espécies encontradas no reservatório foram: Eichhornia crassipes, Eichhornia azurea, Pistia stratiotes, Paspalum repens, Cyperus brevifolius, Paspalum conspersum, Echinochloa polystachya, Egeria densa, Egeria najas, Polygonum hidropiperoides, Polygonum lapathifolium, Alternanthera philoxeroides, Eleocharis sellowiana, Nymphaea ampla, Pontederia cordata, Salvinia auriculata, Salvinia rotundifolia e Typha angustifolia. As maiores frequências relativas foram observadas em: E. azurea (36,11%), E. crassipes (16,67%), P. stratiotes (13,89%), S. auriculata (13,89%), C. brevifolius (11,11%) e P. lapathifolium (6,94%).

Reduction of nutrient contaminants into shallow eutrophic waters through vegetated treatment beds

2013 ◽  
Vol 68 (6) ◽  
pp. 1280-1287 ◽  
Author(s):  
P. Han ◽  
K. Vijayaraghavan ◽  
S. Reuben ◽  
E. S. Estrada ◽  
U. M. Joshi
Keyword(s):  
Pollution Control ◽  
Plant Uptake ◽  
Nutrient Loading ◽  
Algal Growth ◽  
Pistia Stratiotes ◽  
Nutrient Concentrations ◽  
Emergent Macrophytes ◽  
Pontederia Cordata ◽  
Floating Plants ◽  
Ecologically Sustainable

One of the most effective mitigative approaches to eutrophication is the reduction of nutrient loading into water bodies. Bioremediation presents an economically viable and ecologically sustainable technology to nutrient pollution control taking advantage of the remarkable ability of plants and their associated microbial community to assimilate and remove nutrients from the environment. In this study, four emergent macrophytes (Cyperus haspan, Pandanus amaryllifolius, Pontederia cordata and Thalia geniculata) and two floating plants (Hygroryza aristata and Pistia stratiotes) were deployed in bank-side treatment beds and comparatively assessed for their remediative capabilities for nutrient control. P. stratiotes exhibited the highest removal efficiency for both nitrate and phosphate among the six plant species studied. Emergent macrophytes, P. amaryllifolius, C. haspan and P. cordata, were also found to be highly effective in nutrient uptake exhibiting removal efficiencies up to 100%. With the exception of T. geniculata, depletion of nutrients as a result of plant uptake significantly impeded the natural colonization of algae invariably leading to improvements in water quality in terms of turbidity and pH. Suppression of algae proliferation by T. geniculata was not preceded by a reduction in nutrient concentrations suggesting that T. geniculata may be directly inhibiting algal growth through allelopathy.

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