Physiological quality of coffee seeds produced under different levels of solar radiation and maturation stages

Baliza, Danielle Pereira; Caixeta, Franciele; Pinho, Édila Vilela de Resende Von; Cunha, Rodrigo Luz da; Martins, David S.; Rosa, Sttela Dellyzete Veiga Franco da

doi:10.1590/s0101-31222012000300008

Cited by 9 publications

(5 citation statements)

References 18 publications

(16 reference statements)

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“…However, under irradiation, it is expected that many intracellular molecules are modified or even inactivated13233. It is also assumed that esterase may be altered by solar radiation, and therefore it may be working with lower efficiency than in unaltered cells.…”

Section: Resultsmentioning

confidence: 99%

Intracellular mechanisms of solar water disinfection

Castro-Alférez

Polo-López

Fernández‐Ibáñez³

2016

Sci Rep

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Solar water disinfection (SODIS) is a zero-cost intervention measure to disinfect drinking water in areas of poor access to improved water sources, used by more than 6 million people in the world. The bactericidal action of solar radiation in water has been widely proven, nevertheless the causes for this remain still unclear. Scientific literature points out that generation of reactive oxygen species (ROS) inside microorganisms promoted by solar light absorption is the main reason. For the first time, this work reports on the experimental measurement of accumulated intracellular ROS in E. coli during solar irradiation. For this experimental achievement, a modified protocol based on the fluorescent probe dichlorodihydrofluorescein diacetate (DCFH-DA), widely used for oxidative stress in eukaryotic cells, has been tested and validated for E. coli. Our results demonstrate that ROS and their accumulated oxidative damages at intracellular level are key in solar water disinfection.

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Section: Resultsmentioning

confidence: 99%

Intracellular mechanisms of solar water disinfection

Castro-Alférez

Polo-López

Fernández‐Ibáñez³

2016

Sci Rep

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“…A principal resposta das plantas à condição de sombreamento durante o período vegetativo é o elevado investimento de nutrientes e fotoassimilados em crescimento. Este forte dreno pode implicar em redução, posteriormente, no número de sementes por planta, mas permite que seja alocada maior quantidade de fotoassimilados por semente, aumentando sua massa e influenciando, inclusive, a composição química e o vigor (BALIZA et al, 2012), desde que o estresse ambiental seja então atenuado. Além disso, em condições de pouca luminosidade ocorre o aumento da área foliar das plantas, como medida de adequação à condição de pouca luz (MARTUSCELLO et al, 2009), e maior área de tecido fotossintetizante pode permitir maior produção de fotoassimilados durante o período reprodutivo para serem enviados às sementes.…”

Section: Resultsunclassified

Abiotic factors in the effect of herbicides on the physiological quality of rice seeds

Venske

Schaedler

Bahry

et al. 2015

Revista Ciência Agronômica

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RESUMO -O objetivo neste trabalho foi avaliar a qualidade fisiológica de sementes de arroz em função da aplicação de herbicidas em duas épocas de semeadura e redução artificial de luz em diferentes fases do desenvolvimento da cultura. O experimento a campo, realizado na safra 2012/2013, constou de fatorial 2x3x5, sendo os fatores: época de semeadura (18/10 e 09/11); herbicida [testemunha (capinada), bispiribaque sódico e penoxsulam]; e fase do desenvolvimento da cultura sob redução de luz (testemunha; fase de plântula; período vegetativo; reprodutivo e todo o ciclo). A cultivar utilizada foi IRGA 424. Em laboratório, foi avaliado o peso de mil sementes, germinação, primeira contagem da germinação, teste de frio, condutividade elétrica e comprimento e massa da matéria seca da parte aérea e de raízes de plântulas. A semeadura mais tardia causa a produção de sementes de arroz com menor massa e qualidade fisiológica. A aplicação de bispiribaque sódico sobre o arroz semeado mais tardiamente, leva à redução do vigor das sementes produzidas. Com a redução artificial da luminosidade durante o período vegetativo, obtêm-se sementes de arroz com maior massa e qualidade fisiológica, já quando ocorre redução de luz por todo o ciclo da cultura, são produzidas sementes de pior qualidade.Palavras-chave: Temperatura. Luz. Bispiribaque sódico. Penoxsulam. Vigor de sementes.ABSTRACT -The aim of this study was to evaluate the physiological quality of rice seeds with the application of herbicides in two sowing seasons, and for the artificial reduction of lighting at different stages of crop development. The field experiment, carried out in the 2012/2013 crop year, consisted of a 2x3x5 factorial, comprising the factors: sowing season (18/10 and 09/11); herbicide [control (weeding), bispyribac-sodium and penoxsulam]; and crop development phase under light reduction (control; seedling stage, vegetative phase, reproductive phase and the entire cycle). The cultivar used was IRGA 424. The following were evaluated in the laboratory: thousand-seed weight, germination, first germination count, cold test, electrical conductivity and the length and weight of seedling shoot and root dry matter. Late sowing results in the production of rice seeds of lower weight and physiological quality. The application of sodiumbispyribac on the rice that was sown later, leads to a reduction in the vigour of the produced seeds. With reductions in artificial lighting during the vegetative phase, rice seeds with greater mass and physiological quality are obtained, whereas when the lighting is a reduced for the entire crop cycle, poor quality seeds are produced.

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“…nKN is the number of normal sprouts; N is the number of seedlings germinated (Sudrajat et al, 2007;Baliza et al, 2012).…”

Section: Germination Percentagementioning

confidence: 99%

Implications of Cocoa Pod Storage and Temperature to the Performance of Pod Components and Seedling Growth

Wibowo

Sari

Susilo

2021

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Cocoa seeds are recalcitrant with some problems in their storage system due to lack of dormancy period. This study aimed to find out the effect of cocoa pod storage in two different temperatures and the storage period towards seed viability and growth of the seedlings. This study applied a split-plot design with storage temperature as main plot and storage period as sub-plot. Cocoa pods of Sulawesi-1 clone were harvested and stored at 20ºC and 29ºC for 3, 7, 14, and 30 days. The stored cocoa seeds were then sown for three months. The findings showed that the storage of cocoa pods at 20ºC for 30 days causing the seed water content was 45%, the growth of the seedlings after the storage was 98.7%, and could press the pod shrinkage (1.6%). The storage of cocoa pods at 29ºC for 30 days could accelerate the reduction process by 68.2%, decreased germination of seeds up to 83.4%, and reduced the water content by 44.2%. The pod storage at 20ºC for 30 days showed a high value in some aspects such as seedling height, stem diameter, leaf area, seedling fresh weight, and shoot/root ratio. The storage of pods at 29ºC for 14 days indicated a high score in the character of germination, seedlingheight, stem diameter, and fresh weight of seedlings. The storage of pods at room temperature could be conducted for 14 days, meanwhile, at controlled temperature, it could be conducted for 30 days

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Physiological quality of coffee seeds produced under different levels of solar radiation and maturation stages

Cited by 9 publications

References 18 publications

Intracellular mechanisms of solar water disinfection

Intracellular mechanisms of solar water disinfection

Abiotic factors in the effect of herbicides on the physiological quality of rice seeds

Implications of Cocoa Pod Storage and Temperature to the Performance of Pod Components and Seedling Growth

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