Trinexapac-ethyl influence on cell membrane thermostability of Kentucky bluegrass leaf tissue

Heckman, Neil L.; Horst, Garald L.; Gaussoin, Roch E.; Tavener, Brett T.

doi:10.1016/s0304-4238(01)00283-7

Cited by 25 publications

(19 citation statements)

References 8 publications

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“…O etil-trinexapac não inibe totalmente o desenvolvimento da planta, mas regula seu desenvolvimento, pela inibição da enzima 3β-hidroxila, responsável pela síntese da giberelina GA 1 , mais ativa biologicamente na planta (Heckman et al 2002). Desta forma, existe um crescimento mais lento, pela ação de giberelinas menos eficientes no processo de alongação celular.…”

Section: Resultsunclassified

Uso de etil-trinexapac em cultivares de arroz de terras altas

Arf

Nascimento

Rodrigues

et al. 2012

Pesqui. Agropecu. Trop.

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O acamamento de plantas em cultivares de arroz, no momento da colheita, acarreta perdas significativas à produtividade. O uso de reguladores vegetais é uma das alternativas para reduzir o acamamento, entretanto, as informações sobre este assunto ainda são escassas. Este trabalho foi desenvolvido com o objetivo de avaliar o uso de doses de etil-trinexapac (0 g ha-1, 50 g ha-1, 100 g ha-1, 150 g ha-1 e 200 g ha-1 do i.a.), aplicadas por ocasião da diferenciação floral, em cultivares de arroz com diferentes tipos de plantas (Caiapó - tradicional; BRS Primavera e BRS Soberana - intermediário; e IAC 202 - moderno), avaliando o desenvolvimento e a produtividade de grãos. O experimento foi desenvolvido no município de Selvíria (MS), durante o ano agrícola de 2007/2008. Concluiu-se que a aplicação de 50 g ha-1, 100 g ha-1 e 150 g ha-1 de etil-trinexapac, por ocasião da diferenciação do primórdio da panícula das cultivares Caiapó, BRS Soberana e BRS Primavera, respectivamente, reduziu a altura de plantas e proporcionou ausência de acamamento; a cultivar IAC 202 dispensou o uso de regulador de crescimento, considerando-se que a mesma praticamente não apresentou acamamento; a aplicação de 50 g ha-1 e 150 g ha-1 de etil-trinexapac, por ocasião da diferenciação do primórdio da panícula, melhorou a produtividade da cultivar Caiapó e BRS Primavera, respectivamente, e a dose de 100 g ha-1 interferiu pouco na cultivar BRS Soberana.

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Section: Resultsunclassified

Uso de etil-trinexapac em cultivares de arroz de terras altas

Arf

Nascimento

Rodrigues

et al. 2012

Pesqui. Agropecu. Trop.

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“…Cell membrane thermostability can be estimated through electrolyte leakage (EL) following exposure to heat stress (Heckman et al 2002, Grigorova et al 2011. Relative EL significantly increased after 2 h under 40 °C stress in Przewalskia tangutica callus, whereas it increased after 3 h in tobacco callus (Table 1).…”

Section: Resultsmentioning

confidence: 99%

Involvement of G6PDH in heat stress tolerance in the calli from Przewalskia tangutica and Nicotiana tabacum

Gong¹,

Chen²,

Li³

et al. 2012

Biologia plant.

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Glucose-6-phosphate dehydrogenase (G6PDH) has been implicated in supplying reduced nicotine amide cofactors for biochemical reactions and in modulating the redox state of cells. In this study, the role of G6PDH in thermotolerance of the calli from Przewalskia tangutica and tobacco (Nicotiana tabacum L.) was investigated. Results showed that Przewalskia tangutica callus was more sensitive to heat stress than tobacco callus. The activity of G6PDH and antioxidant enzymes (ascorbate peroxidase, catalase, peroxidase and superoxide dismutase) in calli from Przewalskia tangutica and tobacco increased after 40 °C treatment, although two calli exhibited a difference in the degree and timing of response to heat stress. When G6PDH was partially inhibited by glucosamine pretreatment, the antioxidant enzyme activities and thermotolerance in both calli significantly decreased. Simultaneously, the heat-induced H 2 O 2 content and the plasma membrane NADPH oxidase activity were also reduced. Application of H 2 O 2 increased the activity of G6PDH and antioxidant enzymes in both calli. Diphenylene iodonium, a NADPH oxidase inhibitor, counteracted heatinduced H 2 O 2 accumulation and reduced the heat-induced activity of G6PDH and antioxidant enzymes. Moreover, exogenous H 2 O 2 was effective in restoring the activity of G6PDH and antioxidant enzymes after glucosamine pretreatment. Western blot analysis showed that G6PDH gene expression in both calli was also stimulated by heat and H 2 O 2 , and blocked by DPI and glucosamine under heat stress. Taken together, under heat stress G6PDH promoted H 2 O 2 accumulation via NADPH oxidase and the elevated H 2 O 2 was involved in regulating the activity of antioxidant enzymes, which in turn facilitate to maintain the steady-state H 2 O 2 level and protect plants from the oxidative damage.Additional key words: antioxidant enzymes, hydrogen peroxide, tobacco.

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“…MDA content in wild-type and G1 to G4 FsGASA4 transgenic lines under normal conditions (C1), and after heat stress at 50°C for 3 h (C2) treated with 50 mM GA 3 and 50 mM SA. There is not much information on the role of GA on abiotic stress responses, although it has been reported that Kentucky bluegrass plants treated with a GA inhibitor were less heat tolerant than untreated plants (Heckman et al, 2002), pointing out to a role of GAs in thermotolerance. These data are in agreement with the observation that exogenous application of GA 3 was able to revert the inhibitory effect of salt, oxidative, and heat stress in Arabidopsis seedlings (Fig.…”

Section: Discussionmentioning

confidence: 99%