Elevated cytokinin content in ipt transgenic creeping bentgrass promotes drought tolerance through regulating metabolite accumulation

Merewitz, Emily; Du, Hongmei; Yu, Wei; Liu, Yimin; Gianfagna, Thomas J.; Huang, Bingru

doi:10.1093/jxb/err372

Cited by 160 publications

(110 citation statements)

References 89 publications

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“…As already reported, various phytohormones regulate the mechanisms of the plant response to abiotic and biotic stresses, and also CKs have a function in the adaptation of stress responses (Ha et al 2012). For example, elevated CK content in ipt transgenic creeping bentgrass (Agrostis palustris) promotes drought tolerance through increasing the activity of antioxidant enzymes such as SOD, peroxidase (POD), and CAT (Merewitz et al 2012). Also, in transgenic tobacco, the overexpression of isopentenyltransferase (IPT) gene prevents the degradation of photosynthetic protein complexes during drought and promotes drought tolerance (Rivero et al 2010).…”

Section: Gibberellins (Gas) Auxins (Iaas) and Cytokinins (Cks)mentioning

confidence: 99%

Involvement of Phytohormones in Plant Responses to Ozone

Pellegrini

Trivellini

Cotrozzi

et al. 2016

Plant Hormones Under Challenging Environmental Factors

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Among various contaminants, ozone (O 3 ) is considered the most ubiquitous and phytotoxic atmospheric pollutant in industrialized and developing countries. It causes extensive risks for plant life, in terms of survival and productivity of wild and cultivated species. Plant response to O 3 resembles the biotic defense reactions and includes two steps: the first is a biphasic oxidative burst with a massive, rapid, and transient increase in apoplastic reactive oxygen species (ROS) production; the second is the induction of the hypersensitive response (HR) and systemic acquired resistance (SAR). In particular, the acute O 3 exposure (high concentrations for a few hours) results in the activation of programmed cell death (PCD) response that interacts with the synthesis of several hormones and other signaling molecules. The cross talk among all these molecules and their complex and interconnected signaling pathways are more important to determine (1) the initiation, propagation, and containment of O 3 -induced cell death, (2) the degree of the sensitivity of plants to this contaminant, and (3) the regulatory potential that plants have to promptly respond to oxidative stress. The present chapter reviews the role of phytohormones (such as ethylene, abscisic acid, gibberellins, auxins, and cytokinins) and other signaling molecules (such as salicylic and jasmonic acids, proline, and brassinosteroids), as well as their synergistic and antagonistic effects, in the complex signaling pathway involved in plant responses to O 3 stress.

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Section: Gibberellins (Gas) Auxins (Iaas) and Cytokinins (Cks)mentioning

confidence: 99%

Involvement of Phytohormones in Plant Responses to Ozone

Pellegrini

Trivellini

Cotrozzi

et al. 2016

Plant Hormones Under Challenging Environmental Factors

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“…Em um estudo com plantas mutantes de grama rasteira (Agrostis stolonifera), com superexpressão de genes associados com a biossíntese de citocinina, Merewitz et al (2012) observaram que o acúmulo de citocinina está diretamente relacionado ao acúmulo de solutos compatíveis, como prolina, glicina, alanina, sacarose, frutose e maltose que, por sua vez, estão relacionados ao ajuste osmótico. Tabela 1.…”

Section: Resultsunclassified

Fisiologia e produção da soja tratada com cinetina e cálcio sob deficit hídrico e sombreamento

Fioreze

Rodrigues²,

Carneiro

et al. 2013

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar o efeito da cinetina e do cálcio sobre as características fisiológicas e produtivas de plantas de soja submetidas a estresses por deficit hídrico e sombreamento na fase de florescimento. Utilizou-se o delineamento de blocos ao acaso, em arranjo de parcelas subdivididas com quatro repetições. Plantas de soja cultivadas em vasos de 38 dm 3 foram submetidas à aplicação de cálcio e cinetina, de forma isolada e combinada, no início do florescimento e, em seguida, submetidas a estresse por deficit hídrico e por sombreamento por 12 dias. Após o período de estresse, as plantas foram conduzidas até a maturação com suprimento adequado de água e radiação. A aplicação de cálcio e cinetina promoveu a manutenção do conteúdo relativo de água nas plantas, após quatro dias de deficit hídrico. O extravasamento de eletrólitos celulares, medido ao final do período de estresse, foi menor em plantas tratadas com cálcio e cinetina. A assimilação de CO 2 foi reduzida pela imposição do estresse, principalmente do deficit hídrico, e a produção de grãos nos dois ambientes foi reduzida na mesma intensidade. Termos de indexação:Glycine max, ácido abscísico, assimilação de CO 2 , florescimento, hormônios vegetais. Physiology and yield of soybean treated with kinetin and calcium under drought and shade conditionsAbstract -The objective of this work was to evaluate the effects of kinetin and calcium applications on the physiologic and productive traits of soybean plants, subjected to drought and shade conditions, at flowering. A randomized complete block design was used, in a split-plot arrangement, with four replicates. Soybean plants cultivated in 38 dm 3 pots were sprayed with calcium and kinetin, alone or mixed, and subjected to drought and shade during 12 days. After stress period, plants were cultivated under appropriate water and light availability. Calcium and kinetin application resulted in maintenance of the relative water content after four days of drought beginning. Membrane damage, measured at the end of stress period, was lower in plants sprayed with calcium and kinetin. CO 2 assimilation diminished by stress condition, mainly under drought, and grain yield decreased at the same intensity in both environments.

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“…This may indicate the role of humic acid in raising the soil water holding capacity and supplying the plants with some nutrients necessary for healthy growth (Higa and Wididana, 1991). Also, this may explain and interpret enhancing tolerance of paspalum plants to low water supply through maintenance of accumulation of several metabolites, particularly amino acids, sugars and organic acids, which play a specific role in the stress response pathways such as stress signalling, osmotic adjustment and respiration for energy production (Merewitz et al, 2012).…”

Section: Chemical Compositionmentioning

confidence: 99%

Response of Seashore Paspalum Turfgrass to Irrigation Periods and Humic Acid

El-Sayed

Shahin

El-Deen

et al. 2016

Scient. J. of Flowers and Ornament. Plants

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ABSTRACT:A trial was carried out in the open field at the Nursery of Hort. Res. Inst., Giza, Egypt during 2014 and 2015 seasons to examine the effect of irrigation periods, alone or plus foliar spraying with humic acid on growth and quality of seashore paspalum (Paspalum vaginatum Swartz). The irrigation periods were once every 3, 6 or 9 days, and the humic acid (liquid organic fertilizer, NPK 10:10:10) was applied at 20 ml/l, after each grass cut. The turfgrass was cultivated by sprigs in plastic trays (40×30×12 cm) filled with a mixture of sand and clay (1:1, v:v).The obtained results indicated that plant height, covering rate percentage, number of shoots/tray and grass fresh and dry weights were descendingly decreased in the two seasons with elongating the irrigation period to reach the minimum values when irrigation was done once every 9 days. However, applying humic acid significantly improved all previous traits, even for the 9 days interval treatment. The opposite was the right regarding the content of chlorophyll a, b and carotenoids (mg/g fresh weight), total sugars (mg/g dry weight), as well as indoles and phenols (mg/100 g fresh weight), as they were progressively increased with prolonging irrigation period. Humic acid treatment was also led to raised content of the different constituents mentioned above. The supremacy in vegetative growth parameters was achieved by the combination of irrigation every 3 days + 20 ml/l humic acid, but in chemical composition it was by irrigation every 9 days + 20 ml/l humic acid combined treatment.So, it could be recommended to spray humic acid at the rate of 20 ml/l on the foliage of seashore paspalum turf after each cut at irrigation rate of once every 9 days to obtain the best growth and performance from a commercial point of view.

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Elevated cytokinin content in ipt transgenic creeping bentgrass promotes drought tolerance through regulating metabolite accumulation

Cited by 160 publications

References 89 publications

Involvement of Phytohormones in Plant Responses to Ozone

Involvement of Phytohormones in Plant Responses to Ozone

Fisiologia e produção da soja tratada com cinetina e cálcio sob deficit hídrico e sombreamento

Response of Seashore Paspalum Turfgrass to Irrigation Periods and Humic Acid

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