Albedo em cerrado sensu stricto como resposta à variação climática e biológica: conexões com índice de vegetação, estoques de carbono e fluxos de CO2

Couto, Diogo Ladvocat Negrão

doi:10.11606/d.8.2009.tde-04022010-133248

Cited by 2 publications

(2 citation statements)

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“…Galvani et al (2001) emphasize that for the conditions of polyethylene covered greenhouse, the values of internal radiation during the day are smaller than the external ones because of the absorption and reflection of a fraction of direct radiation by polyethylene. As sunlight induces the synthesis of anthocyanins (Couto, 2009), this may explain the difference in the contents of this secondary metabolite among plants from the HF and CF (Figure 2). Moreover, according to Gobbo-Neto & Lopes (2007), anthocyanin is an antioxidant flavonoid accumulated in superficial tissues, with protective action of chlorophyll against photo-destruction through the absorption of UVB rays.…”

Section: Resultsmentioning

confidence: 99%

Production and photosynthetic activity of Mimosa Verde and Mimosa Roxa lettuce in two farming systems

et al. 2014

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RESUMO Produção e atividade fotossintética de alface Mimosa Verde e Roxa em dois sistemas de cultivoA alface (Lactuca sativa L.) é a hortaliça folhosa mais consumida na alimentação do brasileiro, sendo boa fonte de vitaminas e de sais minerais. É largamente produzida no sistema convencional. No entanto, o cultivo hidropônico vem ganhando espaço no mercado, conquistando a confiança dos consumidores, cada vez mais exigentes com a qualidade dos alimentos. O objetivo deste trabalho foi avaliar o desempenho de duas cultivares de alface, nos sistemas de cultivo hidropônico e convencional, para a produção de massa fresca (MF) e massa seca (MS), fotossíntese, teores de Lettuce (Lactuca sativa L.) is the most commonly consumed leaf vegetable in the Brazilian diet, and it is a good source of vitamins and minerals. It is widely grown in the conventional farming system. However, the hydroponic farming system has been gaining importance in the market, wining confidence from consumers, who are becoming increasingly more demanding on food quality. The objective of this study was to evaluate the performance of two lettuce cultivars on hydroponic and conventional farming systems for the production of fresh mass (FM) and dry mass (DM), photosynthesis, contents of chlorophyll and anthocyanin. The following two experiments were carried out: hydroponics farming (HF) and conventional farming (CF), performed in protect and unprotect environments, respectively, in Florianópolis, SC. Mimosa Verde cultivar (MV) showed greater fresh mass than Mimosa Roxa (MR), in both farming systems and the two cultivars presented better performance in the hydroponic system (287.7 g MV and 139.1 g MR) than the conventional system (129.7 g MV and 111.8 g MR). Mimosa Verde cultivar presented lower average contents of total chlorophyll (7.7 mg g -¹ FM) than Mimosa Roxa (11.8 mg g -¹FM), and both cultivars displayed higher means for this variable in the hydroponic farming system. Mimosa Roxa presented higher contents of anthocyanin in the conventional system (88.24 mg g -¹ FM) than the ones in the hydroponic system (36.89 mg g -¹ FM). The best results for CO 2 net assimilation rate regarded to photosyntheticaly active photon flux density were found in the hydroponic system, for both lettuce cultivars. Variation in the contents of chlorophyll were also found. Those variations were higher in the protected system than in the hydroponic system and contents of anthocyanin were higher in the conventional system.

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Section: Resultsmentioning

confidence: 99%

Production and photosynthetic activity of Mimosa Verde and Mimosa Roxa lettuce in two farming systems

et al. 2014

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“…Esta grandeza varia dentro dos períodos seco e chuvoso dado a uma mudança que a superfície pode sofrer. Em um trabalho feito por Couto (2009), a reflexão da radiação PAR oscilou de 2% entre os meses de fevereiro a março para 6% entre setembro a outubro. Segundo o autor, esse coeficiente aumentou numa escala interanual após um período de três anos de queda contínua da precipitação.…”

Section: Introductionunclassified

Variação Da Reflexão De Diferentes Ondas De Uma Região De Cerrado Da Baixada Cuiabana Sob Diferentes Coberturas Do Céu

Cunha¹,

Nogueira

Pinto

et al. 2014

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Albedo em cerrado sensu stricto como resposta à variação climática e biológica: conexões com índice de vegetação, estoques de carbono e fluxos de CO2

Cited by 2 publications

References 23 publications

Production and photosynthetic activity of Mimosa Verde and Mimosa Roxa lettuce in two farming systems

Production and photosynthetic activity of Mimosa Verde and Mimosa Roxa lettuce in two farming systems

Variação Da Reflexão De Diferentes Ondas De Uma Região De Cerrado Da Baixada Cuiabana Sob Diferentes Coberturas Do Céu

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