Trocas gasosas e eficiência fotossintética em ecótipos de feijoeiro cultivados no semiárido

Ferraz, Rener Luciano de Souza; Melo, Alberto Soares de; Suassuna, Janivan Fernandes; Brito, Marcos Eric Barbosa; Fernandes, Pedro Dantas; Júnior, Edivan da Silva Nunes

doi:10.1590/s1983-40632012000200010

Cited by 55 publications

(39 citation statements)

References 18 publications

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“…The maximum rates of E was 5.45 and 1.24 g cm -3 , respectively. These results were similar to those found by Ferraz et al (2012) in common bean ecotypes grown under field conditions in the Semiarid region of Brazil.…”

Section: Resultssupporting

confidence: 90%

Gas Exchange and Photochemical Efficiency in Lima Bean Genotypes Grown in Compacted Soils

et al. 2018

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-The effects of soil compaction on crop growth and productivity have been well studied in recent years, however, studies on the physiological responses of crops to compaction are scarce. The objective of this study was to evaluate the effect of soil compaction on gas exchange, and photochemical efficiency of lima bean (Phaseolus lunatus L.) genotypes of different growth habits. The experimental design was a randomized block in a 3×4 factorial arrangement, with three lima bean genotypes (Branca-Pequena, Orelha-de-Vó and Roxinha) and four compaction levels (soil densities of 1.1, 1.3, 1.5 and 1.7 g cm -3 ), with four replications. The following variables were evaluated at 38 days after sowing: photosynthetic rate (A), leaf transpiration (E), stomatal conductance (g s ), internal CO 2 concentration (Ci), instantaneous water use efficiency (WUE), intrinsic water use efficiency (iWUE), instantaneous carboxylation efficiency (iCE) and photochemical efficiency (Fo, Fm, Fv and Fv/Fm). The data were subjected to analysis of variance at 5% probability by the F test. The genotypes showed a reduction in the photosynthetic rate with increasing soil compaction. The soil compaction affected the photochemical efficiency of the genotype Orelha-de-Vó, with the Fm and Fv fitting to the linear model, and the Fv/Fm fitting to the quadratic model. The genotype Orelha-de-Vó had the highest rate of E and g s at the soil densities of 1.24 and 1.29 g cm -3 , respectively. Regarding the photosynthetic rate, the genotype Roxinha is more efficient than Branca-Pequena at the soil density of 1.7 g cm -3 .Keywords: Phaseolus lunatus L.. Physical impediment. Photosynthetic rate. TROCAS GASOSAS E EFICIÊNCIA FOTOQUÍMICA DE GENÓTIPOS DE FAVA CULTIVADOS EM SOLO COMPACTADORESUMO -Os efeitos da compactação do solo no crescimento e produtividade das culturas têm sido muito estudados nos últimos anos, porém, as respostas fisiológicas das culturas à compactação não têm recebido a devida atenção. Objetivou-se avaliar o efeito da compactação do solo nas trocas gasosas e na eficiência fotoquímica de genótipos de fava (Phaseolus lunatus L.) de diferentes hábitos de crescimento. O delineamento experimental utilizado foi em blocos casualizados no arranjo fatorial 3 × 4, sendo três genótipos de fava (Branca pequena, Orelha de vó e Roxinha) e quatro níveis de compactação (densidades de solo de 1,1; 1,3; 1,5 e 1,7 g cm -3 ), com quatro repetições. Aos 38 dias após a semeadura, analisaram-se as seguintes variáveis: taxa fotossintética (A), transpiração foliar (E), condutância estomática (g s ), concentração interna de CO 2 (Ci), eficiência instantânea no uso da água (EUA), eficiência intrínseca no uso da água (EIUA), eficiência instantânea de carboxilação (EiC) e eficiência fotoquímica (Fo, Fm, Fv e Fv/Fm). Os dados foram submetidos à análise de variância a 5% de probabilidade pelo teste F. Os genótipos apresentaram redução na taxa fotossintética com aumento da compactação do solo. Houve efeito da compactação do solo na eficiência fotoquímica apenas par...

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Section: Resultssupporting

confidence: 90%

Gas Exchange and Photochemical Efficiency in Lima Bean Genotypes Grown in Compacted Soils

et al. 2018

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“…According to Müller et al (2005), those of the LAI increased results with the use of irrigation can be explained by the significant increase in CO 2 assimilation surface and photosynthetic active radiation interception, increasing respiration and increasing the plant's consumption of the water available. Ferraz et al (2012) highlights that through the greater availability of water, plants increase gas exchange between plant and atmosphere, causing expansion of plant tissues and shoot development. For the evaluation of the LAI in the second cut, two collections were made, the first 15 days after the first cut, or 65 DAS, in order to verify the culture resprouting behavior and the importance of water on the new leaf area index.…”

Section: Resultsmentioning

confidence: 99%

“…Ferraz et al (2012) point out that through the greater availability of water, plants increase gas exchange between plant and atmosphere, causing expansion of plant tissues and shoot development, especially leaves, which are essential when it comes to pasture dry matter.…”

Section: Resultsmentioning

confidence: 99%

Variation of leaf area index of the forage sorghum under different irrigation depths in dynamic of cuts

Kirchner¹,

Robaina²,

Peiter³

et al. 2017

Afr. J. Agric. Res.

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The determination of leaf area index is a variable of great importance for predicting productivity, especially when it comes to forage species where the desired product is the leaves. This study aimed to determine the variation of the leaf area index of forage sorghum when subjected to different irrigation depths in four culture cuts. Treatments consisted of six irrigation depths, these being 0, 60, 80, 100, 120 and 140% of the reference evapotranspiration. Seven evaluations of leaf area index (LAI) were performed, which were in the four cuts, specifically at 50, 80, 110 and 140 days after sowing (DAS), and also 15 days after each cut to evaluate the culture's resprouting, that is, at 65, 95 and 125 DAS. The delineation was randomized blocks, with six treatments and four blocks, totaling 24 experimental units. The experiment was conducted in Santiago-RS. Sowing was done on November 18, 2014. Using an irrigation system sprinkler, with one main row and six lateral rows, of PVC, being the irrigation levels differentiated by the nozzle diameter difference of sprinkler each lateral row. Samples of 0.5 linear meters per plot were collected in each of the seven evaluations, totaling 24 samples for evaluation. The analysis of leaf area index was performed using the computer program ImageJ. Significant results were found for the influence of the different irrigation levels on the leaf area index in the four cuts (recommended periods for grazing) evaluated, as well as for resprouting evaluations in the intermediate periods between cuts. Quadratic equations were adjusted for all the evaluation dates, where the 100 and 120% reference evapotranspiration levels alternated the largest LAI for all evaluations. The results also characterize that the second cut, or second grazing period of the irrigated forage sorghum, was the most productive, being it possible to recommend an increase in the animal load, or increase in grazing period in the area in this period. In this way, irrigation by sprinkling in the sorghum culture was characterized as an alternative for producers to increase leaf area index, and, consequently, crop productivity.

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“…Nessas condições, a taxa de fotossíntese também acaba sendo reduzida (Ferraz et al, 2012), o que não aconteceu com a cultivar Sancho, pois apesar de apresentar menor condutância estomática, essa cultivar não reduziu a taxa de assimilação líquida de CO 2 . Isso pode ter ocorrido em decorrência do metabolismo dessa planta, que no mesmo ambiente das demais consegue realizar mais fotossíntese, com uma menor abertura estomática e com menos CO 2 nos espaços intercelulares sem comprometer a eficiência no uso da água.…”

Section: Resultsunclassified

Trocas gasosas e produtividade de três cultivares de meloeiro conduzidas com um e dois frutos por planta

et al. 2014

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ResumoObjetivou-se, no presente trabalho, avaliar as trocas gasosas e sua influência na produtividade e qualidade de cultivares de melão conduzidas com um e dois frutos por planta. O experimento foi conduzido de setembro a dezembro de 2013. Utilizouse o delineamento de blocos ao acaso, em esquema fatorial 3 x 2, com seis repetições. No primeiro fator foram alocadas as cultivares de melão pertencentes aos tipos amarelo, rendilhado e pele de sapo e no segundo fator, a condução das plantas com um e dois frutos por planta. Foram utilizadas três cultivares de melão para cada tipo. As avaliações foram realizadas aos 40 e aos 56 dias após o transplantio. As características avaliadas foram: taxa de assimilação líquida de CO 2 (A), transpiração foliar (E), condutância estomática (g s ) e concentração interna de CO 2 (C i ). A partir dessas medidas foi calculada a eficiência no uso da água (WUE). O teor de sólidos solúveis foi determinado por leitura direta, enquanto que a massa média dos frutos foi mensurada no momento da colheita, estimando-se a produtividade. Diante dos resultados, pode-se concluir que as diferenças nos índices de trocas gasosas para as cultivares de melão do tipo pele de sapo não influenciaram na produtividade e no teor de sólidos solúveis. Como melão do tipo amarelo e do tipo rendilhado recomendam-se as cultivares Goldex e Louis, respectivamente. Independente da cultivar, recomenda-se o cultivo de melão com dois frutos por planta, por assim as plantas apresentarem maior produtividade sem alterar de forma expressiva os índices de trocas gasosas delas.Palavras-chave: Cucumis melo L., taxa assimilatória líquida de CO 2 , transpiração, condutância estomática, eficiência no uso da água.Gas exchange and productivity from three cultivars of melon conduced with one and two fruit per plant AbstractThe objective of the present work was to evaluate gas exchange and its influence on productivity and quality of melon cultivars conducted with one and two fruits per plant. The experiment was conducted from September to December, 2013. The experimental design was of randomized blocks in factorial design 3 x 2 with six replications. In the first factor were allocated the melon cultivars, belonging to types canary melon, net melon and frog skin melon; and the second factor was the conduction of plants with one and two fruits per plant. Three melon cultivars were used for each type. The evaluations were performed at 40 and 56 days after transplanting. The characteristics evaluated were: CO 2 assimilation rate (A), transpiration (E), stomatic conductance (gs), the internal CO 2 concentration (Ci). From these measurements was calculated water use efficiency (EUA). The soluble solids content was determined by direct reading, while the average fruit weight was measured at harvest, estimating productivity. With the results, it can be concluded that differences in gas exchange indexes to cultivars of frog skin melon type have no influence on productivity and soluble solids content. To cultivars of canary melon and net melon ...

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Trocas gasosas e eficiência fotossintética em ecótipos de feijoeiro cultivados no semiárido

Cited by 55 publications

References 18 publications

Gas Exchange and Photochemical Efficiency in Lima Bean Genotypes Grown in Compacted Soils

Gas Exchange and Photochemical Efficiency in Lima Bean Genotypes Grown in Compacted Soils

Variation of leaf area index of the forage sorghum under different irrigation depths in dynamic of cuts

Trocas gasosas e produtividade de três cultivares de meloeiro conduzidas com um e dois frutos por planta

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