Reguladores vegetais e atividade de invertases em cana-de-açúcar em meio de safra

Leite, Glauber Henrique Pereira; Crusciol, Carlos Alexandre Costa; Lima, Giuseppina Pace Pereira; Silva, Marcelo de Almeida

doi:10.1590/s0103-84782009000300014

Cited by 19 publications

(29 citation statements)

References 15 publications

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“…Constatou-se ainda que a maioria das variáveis que apresentaram resposta significativa apresentou redução quando as sementes foram tratadas com doses muito elevadas (20 mL kg -1 de sementes), indicando que quantidades excessivas de bioestimulante podem provocar efeito tóxico à planta e baixo aproveitamento dos hormônios vegetais, podendo assim resultar em perda na eficiência agronômica do biorreguladores (LEITE et al, 2009), a eficiência agronômica dos biorreguladores é afetada de forma significativa pela dosagem, uma vez que quantidades excessivas podem provocar efeito tóxico à planta e baixo aproveitamento dos hormônios vegetais. …”

Section: Resultsunclassified

Use of biostimulants in relieving salt stress in popcorn

Oliveira

Medeiros

Cunha

et al. 2016

Revista Ciência Agronômica

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) e quatro doses de bioestimulante aplicado via tratamento de sementes (0; 5; 10 e 20 mL kg -1 de sementes), com cinco repetições. Utilizou-se o bioestimulante comercial Stimulate ® (0,009% citocinina, 0,005% giberelina e 0,005% de auxina) e as plantas foram coletadas aos 50 dias após a semeadura. Foram avaliadas as seguintes variáveis: altura de plantas, diâmetro do colmo, número de folhas, área foliar, massa seca de colmo, massa seca de folhas, massa seca de raiz, massa seca de pendão, massa seca total e área foliar específica. O uso de água salina na irrigação provocou redução na maioria das variáveis de crescimento do milho doce, independentemente do tratamento de sementes com bioestimulante. O tratamento de sementes com Stimulate ® promove o desenvolvimento de plantas de milho pipoca, mais não inibiu nem amenizou o efeito da salinidade sobre as plantas. Palavras-chave: Zea mays. Fitorregulador. Qualidade da água.ABSTRACT -The use of biostimulants has become widespread in Brazilian agriculture, promoting growth and increased crop yields. However, studies on the use of these substances in plants under stress are still being developed, especially for salt stress. The aim was to evaluate the use of bio-stimulants to relieve salt stress in popcorn. The experiment was carried out in a greenhouse on the campus of the Federal Rural University of the Semi-Arid in Mossoró, in the State of Rio Grande do Norte, Brazil. A completely randomised design was used, with treatments distributed in 2 x 4 factorial scheme, representing two levels of salinity of the irrigation water (0.5 and 4.5 dS m -1 ) and four levels of biostimulant, applied by seed treatment (0, 5, 10 and 20 ml kg -1 seed), with five replications. The commercial biostimulant Stimulate® was used (0.009% cytokinin, 0.005% gibberellin and 0.005% auxin), with the plants being harvested 50 days after sowing. The following variables were evaluated: plant height, stem diameter, number of leaves, leaf area, stem dry weight, leaf dry weight, root dry weight, tassel dry weight, total dry weight and specific leaf area. The use of saline water for irrigation caused a reduction in most growth variables in the sweet corn, regardless of seed treatment with biostimulants. Seed treatment with Stimulate® promotes development in popcorn, but did not inhibit or lessen the effect of salinity on the plants.

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Section: Resultsunclassified

Use of biostimulants in relieving salt stress in popcorn

Oliveira

Medeiros

Cunha

et al. 2016

Revista Ciência Agronômica

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“…+ Glyphosate, and Sulfomethuron-methyl ( Figure 2E). LEITE et al (2009) reported high correlation between the invertases activity and the weather conditions at the middle of the season where the acid activity was higher in weather conditions favorable to plant vegetative development and when the weather conditions were favorable to natural ripening the neutral invertases activity increased.…”

Section: Resultsmentioning

confidence: 98%

Plant regulators and invertase activity in sugarcane at the beginning of the harvest season

et al. 2015

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“…The highest activity of SPS and the lowest activity of SAI probably resulted in an increase in the concentration of sucrose in the winter, at low temperatures, suggesting that the activity of SPS is one of the factors involved in the control of sucrose accumulation in sugarcane. Leite et al (2009) observed an increase in SAI activity through the use of chemical ripeners under high precipitation, a condition favorable for sugarcane plant development. However, when subjected to decreases in temperature and precipitation, which are favorable conditions for natural ripening, the application of chemical ripeners resulted in elevated NI activity.…”

Section: The Role Of Enzymes In Ripeningmentioning

confidence: 95%

“…Plant growth regulators promote distinct and significant alterations in the enzymatic activities of acid and neutral invertases (Leite et al, 2009, Siqueira, 2009). …”

Section: The Role Of Enzymes In Ripeningmentioning

confidence: 99%