Efeito do fósforo na captação de minerais e pigmentação de Azolla caroliniana Willd. (Azollaceae)

Adalberto, Paulo Roberto; Massabni, Antônio Carlos; Goulart, Antônio José; Monti, Rubens; Lacava, P. M.

doi:10.1590/s0100-84042004000300017

Cited by 6 publications

(5 citation statements)

References 15 publications

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“…Rapid growth of another species, A. caroliniana, was observed at high concentrations of phosphorus. The metabolism associated with symbiotic nitrogen fixation by A. caroliniana-Anabaena azollae declined due to the stress induced by phosphorus deficiency, and the reduction in the nitrogen-fixing cyanobacteria caused lower levels of nitrogen to accumulate in the tissues (Adalberto et al, 2004). The importance of P limitation was also found by a study of the growth of A. filiculoides in different habitats with various phosphorus levels.…”

Section: Resultsmentioning

confidence: 89%

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Temporal variation in the biomass and nutrient status of Azolla filiculoides Lam. (Salviniaceae) in a small shallow dystrophic lake

2012

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Aim: This study determined the temporal variation of the biomass and the concentrations of carbon, nitrogen and phosphorus in Azolla filiculoides Lam. in a small (0.5 ha) shallow dystrophic lake located in the city of Rio Grande (Rio Grande do Sul State, Brazil). Method: Sampling was conducted monthly between November 2000 and October 2001. The macrophytes were collected randomly in three replicates with a circular collector 0.3 m in diameter and subsequently washed with tap water and oven-dried at 60 °C for determination of the dry weight and the nutrient status (i.e., carbon, nitrogen and phosphorus). Primary productivity was estimated by the variation in biomass among successive samples. Results: A. filiculoides was present in the lake throughout the year and occupied between 50 and 80% of the surface area. The biomass values ranged from 34.2 g DW.m -2 , recorded in May (autumn), to 170.9 g DW.m -2 in January (summer). The highest rate of primary productivity was 3.3 g DW.m -2 .d -1 , observed in June. The concentrations of carbon, nitrogen and phosphorus in the plant ranged between 403 and 551 g.kg -1 , 13.4 and 25.7 g.kg -1 and 0.5 and 1.9 g.kg -1 , respectively. The water N:P ratio ranged between 19:1 and 368:1. Conclusion: The coverage of the surface of the lake by A. filiculoides throughout the study period and the nutritional status of the plant demonstrate the importance of the cycling of nutrients by macrophytes in this aquatic environment. The higher N:P ratio in the water column, compared with other neighboring environments without macrophytes, shows that the enrichment of the lake may result from the biological N-fixation activity produced by A. filiculoides.Keywords: primary production, floating macrophytes, carbon, phosphorus, nitrogen.Resumo: Objetivo: Este estudo determinou a variação temporal da biomassa e as concentrações de carbono, nitrogênio e fósforo de Azolla filiculoides Lam., em um pequeno lago raso distrófico situado no município do Rio Grande (Rio Grande do Sul, Brasil). Método: As amostragens foram realizadas mensalmente no período entre novembro de 2000 e outubro de 2001. As macrófitas foram coletadas aleatoriamente em três repetições, utilizando-se coletor circular de 0,3 m de diâmetro e posteriormente lavadas com água corrente e secas em estufa 60 °C para determinação do peso seco e dos nutrientes: carbono, nitrogênio e fósforo. A produção primária foi estimada pela variação de biomassa entre coletas sucessivas. Resultados: A. filiculoides esteve presente no lago durante todo o ano, ocupando sempre entre 50 e 80% da superfície do lago. Os valores de biomassa variaram entre 34,2 g PS.m -2 , registrado em maio (outono) e 170,9 g PS.m -2 em janeiro (verão). A maior taxa de produtividade primária foi 3,3 g PS.m -2 .d -1 foi registrada em Junho. As concentrações de carbono, nitrogênio e fósforo na planta variaram entre: 403 e 551 g. kg -1 , 13,4 e 25,7 g.kg -1 e 0,5 e 1,9 g.kg -1, respectivamente. Os valores da relação N:P na coluna de água variou entre 19:1 e 368:1. Conclus...

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Section: Resultsmentioning

confidence: 89%

“…A phosphorus deficiency results in a general failure of metabolism in plants and the ensuing production of pigments (Adalberto et al, 2004). In contrast, a high concentration of P increases C and N accumulation by the plant and stimulates the plant's growth, favoring the development of blooms Cheng et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Temporal variation in the biomass and nutrient status of Azolla filiculoides Lam. (Salviniaceae) in a small shallow dystrophic lake

2012

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“…Azolla caroliniana grew slower in fish farming effluent than in Hoagland ½ medium probably due to low nutrient availability. Phosphorus concentration in the fish farming effluent (0.05 ± 0.01 mg.L -1 ) was below the minimal nutritional requirements of A. caroliniana (~ 3 mg.L -1 ) (Adalberto et al, 2004). Nitrate concentration was also low in fish farming effluent.…”

Section: Discussionmentioning

confidence: 90%

“…Growth of A. caroliniana was low since there are reports of relative growth rates over 0.1 d -1 for this species in nutrient rich solution (Maejima et al, 2001;Arora and Singh, 2003;Adalberto et al, 2004) and rates varying from 0.017 to 0.045 d -1 for A. filliculoides in fish farming effluent (Forni et al, 2001). Salvinia auriculata cultivated in Hoagland ½ medium showed relative growth rate higher than S. herzogii (0.016 d -1 ) (Panigatti and Maine, 2003) but lower than S. molesta (0.045-0.17 d -1 ) and S. minima (0.088-0.175 d -1 ) in nutrient rich solution (Mitchell and Tur, 1975;Sale et al, 1985, Olguín et al, 2007.…”

Section: Discussionmentioning

confidence: 99%

Performance of Azolla caroliniana Willd. and Salvinia auriculata Aubl. on fish farming effluent

Toledo

Penha

2011

Braz. J. Biol.

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The increasing release of untreated fish farming effluents into water courses that flow to the Pantanal wetlands in Mato Grosso (Brazil) may drive this ecosystem to eutrophication. Therefore, the growth of Azolla caroliniana Willd. and Salvinia auriculata Aubl. in fish farming effluent and their effect on its quality were evaluated for 48 days in a greenhouse. The results were compared to those obtained in a nutrient rich solution (Hoagland ½ medium). Azolla caroliniana showed lower relative growth rate in fish farming effluent (0.020 d-1) than in Hoagland ½ medium (0.029 d-1). However, S. auriculata grew slightly better in fish farming effluent (0.030 d-1) than in Hoagland ½ medium (0.025 d-1). The species apparently contributed to reduce nitrate and phosphate concentration in Hoagland ½ medium. However, in fish farming effluent, only electrical conductivity and pH were reduced by plants compared to the control without plants. Thus, A. caroliniana and S. auriculata show low potential for improving effluent quality.

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“…e Azolla caroliniana Willd. podem ser usadas em tratamentos de ecossistemas aquáticos eutrofizados, por absorverem altas doses de nutrientes (Reddy & Debusk 1985, Adalberto et al 2004.…”

Section: Introductionunclassified

Germinação de megásporos e desenvolvimento esporofítico inicial da filicínea Regnellidium diphylum (Marsileaceae) sob deficiências minerais

Wunder¹,

Droste

Windisch

2010

Rev. bras. Bot.

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-(Megaspore germination and initial sporophytic development of the fern Regnellidium diphyllum (Marsileaceae) under mineral deficiencies). Regnellidium diphyllum lindm. is a heterosporous fern in the Marsileaceae family with restricted distribution to southern Brazil and some adjoining localities in uruguay and Argentina. the species has been listed as vulnerable in the endangered species list of the State of Rio Grande do Sul. In the present study we verified the effect of absence of mineral nutrients on megaspore germination and initial development of R. diphyllum sporophytes in vitro. the effect of Meyer's nutrient solutions modified by the absence of NH 4 no 3 , nacl, Fecl 3 ·6h 2 o, Mgso 4 ·7h 2 o, Kh 2 Po 4 or cacl 2 was analyzed in the germination and sporophyte formation of R. diphyllum. Megaspore germination decreased in absence of cacl 2 (52%) when compared to the control (77.3%). A low percentage of gametophytes gave rise to sporophytes in the absence of Mgso 4 ·7h 2 o (38.6%) and Kh 2 Po 4 (33.8%). Without cacl 2 in the solution, no sporophytes were formed. the length of the primary root and of the primary and secondary leaves was significantly reduced without MgSO 4 ·7h 2 o and Kh 2 Po 4 . Without Kh 2 Po 4 in the solution, no secondary leaf was formed after five weeks of culture. The other treatments did not inhibit the megaspore germination process and the initial development of sporophytes, showing that the species may establish itself even under low levels of these nutrients.Key words -aquatic macrophyte, ecophysiology, mineral nutrition, pteridophytes, reproduction RESUMO -(Germinação de megásporos e desenvolvimento esporofítico inicial da filicínea Regnellidium diphylum (Marsileaceae) sob deficiências minerais). Regnellidium diphyllum Lindm. é uma filicínea heterosporada da família Marsileaceae, de distribuição restrita ao sul do Brasil e algumas localidades do uruguai e da Argentina. A espécie se encontra na lista de espécies ameaçadas de extinção do Rio Grande do Sul, como vulnerável. No presente estudo, verificou-se o efeito da ausência de nutrientes minerais na germinação de megásporos e no desenvolvimento inicial de esporófitos de R. diphyllum in vitro. o efeito de soluções nutritivas de Meyer modificadas pela ausência de NH 4 no 3 , nacl, Fecl 3 ·6h 2 o, Mgso 4 ·7h 2 o, Kh 2 Po 4 ou cacl 2 foi analisado na germinação e na formação de esporófitos de R. diphyllum. A germinação dos megásporos foi reduzida na ausência de CaCl 2 (52%), quando comparada ao controle (77,3%). Houve baixa porcentagem de gametófitos com formação de esporófitos na ausência de MgSO 4 ·7h 2 o (38,6%) e de Kh 2 Po 4 (33,8%), sendo que na ausência de CaCl 2 não houve formação de esporófitos. O comprimento da raiz primária e das folhas primária e secundária foi reduzido significativamente na ausência de Mgso 4 ·7h 2 o e de Kh 2 Po 4 , destacando-se que na ausência de KH 2 Po 4 não ocorreu desenvolvimento da folha secundária após cinco semanas em cultura. os demais tratamentos não comprometeram o processo de ger...

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Efeito do fósforo na captação de minerais e pigmentação de Azolla caroliniana Willd. (Azollaceae)

Cited by 6 publications

References 15 publications

Temporal variation in the biomass and nutrient status of Azolla filiculoides Lam. (Salviniaceae) in a small shallow dystrophic lake

Temporal variation in the biomass and nutrient status of Azolla filiculoides Lam. (Salviniaceae) in a small shallow dystrophic lake

Performance of Azolla caroliniana Willd. and Salvinia auriculata Aubl. on fish farming effluent

Germinação de megásporos e desenvolvimento esporofítico inicial da filicínea Regnellidium diphylum (Marsileaceae) sob deficiências minerais

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