Radiação, fotossíntese, rendimento e qualidade de frutos em macieiras 'Royal Gala' cobertas com telas antigranizo

Amarante, Cassandro Vidal Talamini do; Steffens, Cristiano André; Mota, Clenilso Sehnen; Santos, Henrique Pessoa dos

doi:10.1590/s0100-204x2007000700003

Cited by 27 publications

(13 citation statements)

References 10 publications

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“…Amarante et al (2007) verificaram que o sombreamento das plantas de macieira, sob telado preto, foi eficiente em aumentar o teor de clorofila foliar em comparação àquelas plantas cultivadas a céu aberto. Essa adaptação foliar ao sombreamento, no entanto, ocasionou redução nos valores de fotossíntese máxima, em consequência de limitações impostas pelas reações de carboxilação.…”

Section: Resultsunclassified

Aspectos fisiológicos do desenvolvimento de mudas de café cultivadas sob telas de diferentes colorações

Henrique

Alves

Deuner

et al. 2011

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar aspectos fisiológicos do desenvolvimento de mudas de café, cultivadas sob telas com diferentes características espectrais. Mudas de Catucaí Amarelo 2SL, no estádio "orelha de onça", foram dispostas em blocos ao acaso, com cinco repetições, sob estruturas cobertas individualmente com telas nas cores azul, branca, cinza, preta e vermelha, com sombreamento de 50%. Quatro meses depois, foram avaliados: o crescimento das mudas, os teores de pigmentos nas folhas, e os de açúcares solúveis totais e o amido das folhas e raízes. A tela vermelha foi a mais eficiente em promover o crescimento em quatro das sete características estudadas: altura das plantas, área e massa de matéria seca foliar e massa de matéria seca total. Para as demais características, não houve diferença entre as telas. A análise dos pigmentos mostrou que, à exceção da tela cinza, as demais não diferiram entre si quanto a esta característica. Nas folhas, a tela vermelha proporcionou maior teor de açúcar e de amido. Na raiz, os teores de carboidratos foram mais elevados com as telas vermelha e preta. Entre as cinco colorações de tela, a vermelha foi a mais eficiente na produção de mudas de café com maior vigor e qualidade, em que se destacam os teores de carboidrato e a fitomassa.Termos para indexação: Coffea arabica, carboidratos, crescimento, pigmentos, qualidade da radiação, viveiro. Physiological aspects of seedling development of coffee grown under colored screensAbstract -The objective of this work was to evaluate the physiological aspects of the development of coffee seedlings grown under colored screens with different spectral characteristics. Seedlings of Catucaí Amarelo 2SL, in the stage known as "orelha de onça", were arranged in a randomized block design, with five replicates, under structures individually covered with blue, white, gray, black or red screens with 50% shade. Four months after, evaluations were done for seedling growth, pigment content of the leaves, total soluble sugars and starch contents of the leaves and roots. The red screen was the most effective in promoting growth in four out of the seven studied traits: plant height, leaf area and leaf dry weight and total dry matter. For the other characteristics, there was no difference among the screens. The pigment analysis showed that, except for the gray screen, the other ones did not differ for this trait. In leaves, the red screen promoted higher levels of carbohydrates and starch. At the root, carbohydrate contents were higher under the red and black screens. Among the five screen colors, the red one was the most efficient in the production of coffee seedlings with higher vigor and quality, with outstanding carbohydrate contents and biomass.

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Section: Resultsunclassified

Aspectos fisiológicos do desenvolvimento de mudas de café cultivadas sob telas de diferentes colorações

Henrique

Alves

Deuner

et al. 2011

Pesq. agropec. bras.

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“…However, there have been only a few studies on the effect and efficiency of this technique on apple trees in Brazil. Studies conducted by Leite et al (2002) and Amarante et al (2007Amarante et al ( , 2009Amarante et al ( , 2011 in southern Brazil showed that anti-hail nets reduce the color intensity of fruits. Leite et al (2002) also observed a lower incidence of russeting on apples cultivated under nets, with no changes in the soluble solids, acidity, starch, or pulp firmness.…”

Section: Introductionmentioning

confidence: 99%

Apple production and quality when cultivated under anti-hail cover in Southern Brazil

et al. 2014

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Anti-hail nets may change the microclimate of orchards and hence modify the physicochemical and sensory characteristics of fruits. The present study aimed to evaluate the effects of anti-hail nets on the physical, chemical, and sensory attributes of apples grown in southern Brazil. The study was conducted in commercial orchards, with apples grown under a black anti-hail net under an open sky during the 2008/2009, 2009/2010, and 2010/2011 cycles. Measurements of photosynthetically active radiation were collected at both sites. Physical, chemical, and sensory analyses of fruits were performed in the laboratory. The anti-hail net reduced incident photosynthetically active radiation by 32%. The light spectrum in the canopy changed the corresponding R/FR (red/far-red) ratio in the lower and upper canopy layers from 0.27 to 1.55, respectively. In contrast to the majority of microclimate studies carried out in the temperate zones of the northern hemisphere, this study in the southern hemisphere showed that although it reduced the incident solar radiation, the cover did not change the color or organoleptic characteristics of "Royal Gala" and "Fuji Suprema" apples. The net cover prolonged the subperiod between fruit setting and harvesting, thus slowing fruit ripening. Therefore, the use of anti-hail nets on apple orchards is a suitable alternative for the protection of apple trees against hail because it causes only small changes in the microclimate and in the maturation period, ensuring fruit production without affecting its quality.

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“…According to Amarante et al (2007), anthocyanin accumulation causes reduction in the values of these parameters, what is reflected in fruit skin color, changing from green to red. These authors found that the 'Fuji' apple side exposed to the sun has lower L and Hº values compared with the shaded side.…”

Section: Resultsmentioning

confidence: 99%

Post-harvest quality of ‘BRS Kampai’ peach submitted to different pruning times

et al. 2017

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The present study aimed to evaluate pruning time and refrigerated storage influence in 'BRS Kampai' peach cultivar. Fruits coming from plants that were pruned during winter (WP), summer (SP) and winter plus summer (WSP), which were stored in a refrigerated chamber for 0, 10, 20 and 30 days at 1 ºC ± 0,5 °C and 90% ± 5% RH. Pruning only in the summer provided higher SS/TA ratio, higher firmness and red intensity in the fruit evaluated. At the end of 30 days, acidity reduction reached 20% compared to the initial value. In the same period, fruits showed 50% of the initial firmness. Matter loss during the storage period was described by a positive linear equation, with 12.0% loss at day 30, after removal from the chamber, and 17% loss after two days at room temperature. Under the conditions in which the experiment was conducted, it was concluded that summer pruning alone provides high SS/TA ratio, as well as increased red color in fruits. In addition, storage period increase causes chemical and physical changes in 'BRS Kampai' cultivar fruits. During the storage period, fruits kept acceptable firmness levels, even after 30 days of storage.Additional keywords: cold storage; conservation; firmness; maturation; Prunus persica. ResumoO presente estudo teve por objetivo avaliar a influencia da época de poda e do armazenamento refrigerado de frutos de pessegueiro da cultivar 'BRS Kampai'. Utilizou-se frutos oriundos de plantas submetidas a poda de inverno (PI), verão (PV) e inverno mais verão (PIV), sendo os mesmos armazenados em câmara refrigerada por 0, 10, 20 e 30 dias à 1 ºC ± 0,5 °C e 90% ± 5% UR. A poda somente no verão proporcionou maior relação SS/AT, maior firmeza de polpa e intensidade de vermelho nos frutos avaliados. Ao final dos 30 dias a redução da acidez chegou a 20% em relação ao valor inicial, neste mesmo período os frutos apresentaram 50% da firmeza inicial. A perda de massa durante o período de armazenamento foi descrita por uma equação linear positiva, sendo a perda aos 30 dias de 12% na saída da câmara e de 17% após dois dias de temperatura ambiente. Nas condições que o experimento foi conduzido foi possível concluir que o uso da poda de verão isoladamente proporciona elevada relação SS/AT, assim como maior coloração vermelha nos frutos, já o aumento do período de armazenamento proporciona alterações químicas e físicas em frutos de 'BRS Kampai'. No decorrer do período do armazenamento os frutos mantiveram níveis aceitáveis de firmeza, podendo os mesmos serem armazenados por até 30 dias.Palavras-chave adicionais: armazenamento refrigerado; conservação; firmeza; maturação; Prunus persica.

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Radiação, fotossíntese, rendimento e qualidade de frutos em macieiras 'Royal Gala' cobertas com telas antigranizo

Cited by 27 publications

References 10 publications

Aspectos fisiológicos do desenvolvimento de mudas de café cultivadas sob telas de diferentes colorações

Aspectos fisiológicos do desenvolvimento de mudas de café cultivadas sob telas de diferentes colorações

Apple production and quality when cultivated under anti-hail cover in Southern Brazil

Post-harvest quality of ‘BRS Kampai’ peach submitted to different pruning times

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