Teores de pigmentos, fluorescência da clorofila &lt;em&gt;a&lt;/em&gt; e índice SPAD em cultivares de girassol sob regimes hídricos

Júnior, Sebastião de Oliveira Maia; Andrade, Jailma Ribeiro de; Ferreira, Rosinaldo de Sousa; Araújo, Danila Lima de; Guerra, Hugo Orlando Carvallo; Silva, Flaviana Gonçalves da

doi:10.30612/agrarian.v10i36.3604

Cited by 6 publications

(4 citation statements)

References 5 publications

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“…Chlorophyll is an important pigment that acts on the chloroplast of plants, capturing light to carry out photosynthesis. The higher the index obtained through the relative chlorophyll contents, the greater the capacity of the sheet to absorb light (MAIA JÚNIOR et al, 2017). Appropriate doses and forms of application of selenium in plants can influence nitrogen absorption and promote the synthesis of proteins that provide greater plant growth (AL-KAZZAZ, 2018).…”

Section: Resultsmentioning

confidence: 99%

Assessment of the effects of selenium application on leaves or substrate on the growth of sunflower plants

Ferreira¹,

Brito²,

Lima³

et al. 2022

Braz. J. Anim. Environ. Res.

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Though Selenium (Se) is a nonessential micronutrient to plants, its presence under appropriate concentrations helps in the plant antioxidant system, thus benefiting crop growth and productivity. Considering the need for acclimatization of crops due to climate changes and the need for diversification of the energy matrix, this study aimed to assess the different concentrations and forms of application of selenium (sodium selenite and sodium selenate) suitable for the cultivation of sunflower plants through growth analysis (height, diameter and number of leaves) and relative chlorophyll contents. The experimental design was completely randomized, and consisted of 18 treatments with 5 replications each, with applications of selenium in the substrate or by leaf spraying. All 18 treatments were independently assessed. Analysis of variance was performed and means were independently compared using the Tukey test (P ≤ 0.05) in the AgroEstat program. Sunflower plants supplemented with 0.8 mg L-1 of sodium selenite in the substrate presented values higher than those of the other treatments for plant height variable. For relative contents of chlorophyll, concentrations of 0.8 mg L-1 and 1.7 mg L-1 of selenate in the substrate and 3.3 mg L-1 of selenite in the substrate stood out. For the other variables, treatments containing selenium were equivalent to the control. It was concluded that the treatments whose application was directly made on the substrate showed higher values than those that received foliar application.

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Section: Resultsmentioning

confidence: 99%

Assessment of the effects of selenium application on leaves or substrate on the growth of sunflower plants

Ferreira¹,

Brito²,

Lima³

et al. 2022

Braz. J. Anim. Environ. Res.

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“…Por outro lado, Custódio et al (2016) obtiveram redução nos teores de clorofilas a e total, com o sombreamento da mandioca em espaçamentos de 1,25 m. Possivelmente, nesse caso, o porte da planta e os níveis de ramificação da cultivar possam ter influenciado nesses resultados. The chlorophyll content is an indicator of plant photosynthetic efficiency, it also directly interferes with growth and adaptability to a new environment (MAIA JUNIOR et al, 2017). The high levels of insolation indicate high levels of irradiation when chlorophylls tend to be photo-oxidized (NASCHITZ et al, 2015).…”

Section: Resultsunclassified

“…O teor de clorofila é um indicador da eficiência fotossintética vegetal e interfere diretamente no crescimento e na adaptabilidade ao ambiente em que se encontram (MAIA JUNIOR et al, 2017). Os níveis elevados de insolação indicam altos níveis de irradiação, ocasião em que as clorofilas apresentam tendência de serem foto-oxidadas (NASCHITZ et al, 2015).…”

Section: Resultsunclassified

Damage levels of sunburn in pineapple fruits submitted to natural and artificial protection

Santos¹,

Alves²,

Uchôa³

et al. 2020

AGRO@MBIENTE ON-LINE

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Pineapple sunburn (SB) occurs mostly in regions with a high incidence of sunlight and temperature, causing damage to the fruits and financial losses for the producer. The objective of this study was to evaluate natural and artificial protection in the reduction of physical and physiological damage in pineapple, submitted to high temperature and sunlight. The experimental design was in randomized blocks with seven treatments: single planting of pineapple (cv. Pérola), with and without the protection of fruits with woven fabrics (TNT) and intercropping with cassava (cv. Amazonas) in different spacing in the row (0.40; 0. 60; 0.80; 1.00; and1.20 m), and three replications. For the study, a scale of damage level (DL) to the pineapple by SB was established, ranging from 0 to 4 (DL0 - 4). Chlorophyll content, mass of fruits and crown, percentage of fruits with SB, and commercial fruits were evaluated. The TNT uses showed maximum protection for the fruits, being all suitable for fresh consumption no damage (DL0). In intercropping, the spacing of 0.80 and 1.20 m is indicated to maximize fruit production and protection. The absence of fruit protection caused damage up to N4, with fruits strictly suitable for industry (70%) and disposal (13%). In an environment with high temperature and irradiation, the adoption of fruit protection is necessary. The planning of floral induction allows the fruiting to not coincide with the critical period of high solar incidence and temperature and can avoid the use of protection strategies. The intercropping of pineapple and cassava protects pineapple fruits against sunburn; moreover, its use does not leave inorganic residues in the environment; therefore, it is strongly recommended as a strategy to reduce sunburn in pineapple fruits.

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“…No cultivo da ervilha, o desenvolvimento morfológico e potencial produtivo está relacionado a eficiência fotossintética, com relação direta do índice SPAD (FERHI et al, 2017). Entretanto, o emprego de metodologias para avaliação da relação entre índice SPAD e conteúdo absoluto de clorofila é necessário para obtenção de modelos matemáticos de predição com estimativas adequadas (JIANG et al, 2017;MAIA JÚNIOR et al, 2017;NOGUEIRA et al, 2018).…”

Section: Introductionunclassified

Pigmentos Foliares Na Cultura Da Ervilha: Relação Entre Índice Spad E Conteúdo De Clorofila

et al. 2021

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Os teores de pigmentos foliares estão diretamente relacionados com as condições de desenvolvimento da planta, sendo a determinação realizada por métodos diretos e indiretos. O trabalho teve como objetivo relacionar os valores do índice SPAD com o conteúdo de pigmentos foliares na cultura da ervilha. A determinação foi realizada em folhas de plantas em estágio reprodutivo, apresentando coloração variando de amarelada para verde escuro. A determinação indireta foi realizada com o equipamento SPAD 502 e a determinação direta por espectrometria utilizando acetona pura como extrator. Foi realizada análise descritiva, correlação e de regressão nos dados. O índice SPAD obtido variou entre 8,2 e 42,2. O teor absoluto de clorofila é elevado em valores de SPAD superiores, ajustado por modelos quadráticos. Foi obtido elevada correlação entre índice SPAD e pigmentos foliares (clorofilas a, b e totais) em folhas de ervilha.

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Teores de pigmentos, fluorescência da clorofila <em>a</em> e índice SPAD em cultivares de girassol sob regimes hídricos

Cited by 6 publications

References 5 publications

Assessment of the effects of selenium application on leaves or substrate on the growth of sunflower plants

Assessment of the effects of selenium application on leaves or substrate on the growth of sunflower plants

Damage levels of sunburn in pineapple fruits submitted to natural and artificial protection

Pigmentos Foliares Na Cultura Da Ervilha: Relação Entre Índice Spad E Conteúdo De Clorofila

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