Photosynthetic pigments and gas exchange in red and green cabbage under no-tillage
            and conventional systems

Echer, Márcia de Moraes; Guimarães, Vandeir Francisco; Inagaki, Adriano Mitio; Dalastra, Graciela Maiara; Hachmann, Tiago Luan

doi:10.5935/1806-6690.20200037

Cited by 2 publications

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“…Segundo estudo de Coutinho et al (2020) [9], os pigmentos fotossintéticos, em especial os teores de clorofilas, são responsáveis pela conversão da radiação luminosa em energia, sob a forma de ATP e NADPH. Havendo assim, no decorrer do ciclo da cultura, um aumento da capacidade fotossintética das plantas, acréscimo este que se deve ao teor da ribulose-1,5bisfosfato carboxilase/oxigenase (Rubisco) [22].…”

Section: Resultsunclassified

Desempenho produtivo e bioquímico de alface crespa sob diferentes ambientes de cultivo

et al. 2021

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O trabalho teve por objetivo avaliar as características morfométricas e bioquímicas de cultivares de alface crespa em estufa e campo no Oeste do Paraná. O delineamento experimental foi de blocos ao acaso em esquema fatorial 2 × 6, com quatro repetições. O primeiro fator constou pelo ambiente de cultivo (estufa e campo) e o segundo, seis cultivares de alface da tipologia crespa (Camila, Isabela, Vanda, Vera, Pira Roxa e Scarlet). As avaliações morfométricas foram realizadas logo após do material vegetal, sendo quantificado a altura de planta, número de folhas, diâmetro da copa, massa fresca da parte aérea, massa fresca de folhas, área foliar e produtividade. Para as características bioquímicas, foram coletadas amostras de tecido foliar das cultivares de alface, em cada ambiente, devidamente identificadas, armazenadas e conduzidas para o laboratório onde foram avaliados teor de clorofila a, b e total, carotenoides, antocianina, acidez titulável, potencial hidrogeniônico e sólidos solúveis. Não foi constatada interação significativa entre as cultivares e os ambientes para as análises morfométricas. Entretanto, a cultivar Vanda apresentou produtividade superior em relação as demais. Em relação aos aspectos bioquímicos, para as variáveis clorofila a e clorofila total, foram observadas as maiores médias para a cultivar Scarlet em estufa. Para teores de antocianina, a cultivar Scarlet apresentou valores superiores a campo e em relação a estufa, a cultivar Pira roxa apresentou maiores teores de carotenoides. O cultivo em estufa proporcionou melhores condições para o cultivo de alface, promovendo de modo geral, resposta superior nas características morfológicas e bioquímicas.

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Section: Resultsunclassified

Desempenho produtivo e bioquímico de alface crespa sob diferentes ambientes de cultivo

et al. 2021

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“…The lack of effect of calcium silicate at 78 DAT may have occurred due to the translocation of the photoassimilates to the main drains of the plant at this time, which are the tomato fruits (Marodin et al, 2014). Changes in A during the growth and development stage of the crop also occur in response to light, temperature, and nutritional status, as this plays an important role in plant adaptations and contributes to them being productive (Echer et al, 2020).…”

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confidence: 99%

“…This difference between the studied phenological stages shows that in the stages of full flowering and fruiting, there was an increase in the values of the SPAD index compared to the other stages. In response to this increase in the values of the SPAD index throughout the crop cycle, there was an increase in the photosynthetic capacity of the plants, which is due to the content of ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) (Echer et al, 2020).…”

Section: Datmentioning

confidence: 99%

Photosynthetic Efficiency of Tomato Plants Submitted to Calcium Silicate Application

Coutinho

Echer

Guimarães

et al. 2020

Rev. Agric. Neotrop.

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The objective was to evaluate the effect of calcium silicate on the chlorophyll content and gas exchange of two tomato hybrids. The design used was in randomized blocks in a 2x5 factorial scheme, with four replications. The first factor was composed of two tomato hybrids: Ivety and Natália, and the second factor was composed of five doses of calcium silicate (0, 150, 300, 450, and 600 kg ha-1), applied to the substrate before planting the seedlings. Gas exchange: net CO2 assimilation rate (A), leaf transpiration rate (E), stomatal conductance (gs), internal CO2 concentration (Ci), water-use efficiency (WUE), intrinsic efficiency water use (iWUE), and instant carboxylation efficiency (ACi); SPAD index and the levels of chlorophylls a, b, and total were evaluated. The analyzes were performed in the stages of first flowering (17 days after transplanting - DAT), full flowering (58 DAT), and full fruiting (78 DAT). At 17 DAT, no difference was observed for gas exchange variables and photosynthetic pigments. The application of calcium silicate reduced gas exchange and photosynthetic pigments at 58 DAT. The hybrid Natália had the highest A, WUE, iWUE, and ACi at 78 DAT. However, the hybrid Ivety in the same growth stage, in full fruiting, was superior only for the internal concentration of CO2 and SPAD index, with no difference for photosynthetic pigments.

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Photosynthetic pigments and gas exchange in red and green cabbage under no-tillage and conventional systems

Cited by 2 publications

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Desempenho produtivo e bioquímico de alface crespa sob diferentes ambientes de cultivo

Desempenho produtivo e bioquímico de alface crespa sob diferentes ambientes de cultivo

Photosynthetic Efficiency of Tomato Plants Submitted to Calcium Silicate Application

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