Influence of 9-beta-L(+)-adenosine on malate dehydrogenase activity in rice

Savithiry, Srinivasan; Wert, Violet; Ries, S. K.

doi:10.1034/j.1399-3054.1992.840321.x

Cited by 6 publications

(8 citation statements)

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“…The enhanced essential oil yield in TRIA-treated leaves might also be ascribed to the increased uptake of leaf-nutrients (N, P and K) that could have been subsequently used to enhance the formation of photosynthates and other metabolites with regard to oil formation. In fact, TRIA induces the activation of a number of membrane bound enzymes (Ries and Houtz 1983;Savithiry et al 1992). The stimulation of these enzymes leads to dephosphorylation of L(?)…”

Section: Yield and Quality Attributesmentioning

confidence: 99%

Triacontanol-mediated regulation of growth and other physiological attributes, active constituents and yield of Mentha arvensis L.

et al. 2011

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Triacontanol (TRIA) has been realized as a potent plant growth promoting substance for a number of agricultural and horticultural crops. Out of a large number of essential oil bearing plants, mint (Mentha arvensis L.) constitutes the most important source of therapeutic agents used in the alternative systems of medicine. The mint plant has marvelous medicinal properties. In view of enhancing growth, yield and quality of this medicinally important plant, a pot experiment was conducted according to simple randomized block design. The experiment was aimed at studying the effect of four concentrations of TRIA (10 -0 , 10 -7 , 10 -6 and 10 -5 M) on the performance of mint with regard to growth and other physiological attributes, crop yield and quality attributes and the yield and contents of active constituents of the plant. The growth and other physiological parameters as well as yield and quality attributes were studied at 100 and 120 DAP. The foliar application of TRIA at 10 -6 M concentration significantly enhanced most of the growth and other physiological attributes, crop herbage yield and the yield and content of active constituents (menthol, L-methone, isomenthone and menthyl acetate) of mint at both the stages. However, the next higher concentration of TRIA (10 -5 M) exhibited slightly negative effect and did not further increase the values of the attributes studied, but it proved significantly better than the control. Application of TRIA significantly enhanced the yield and content of all the active constituents determined by GLC technique.

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Section: Yield and Quality Attributesmentioning

confidence: 99%

Triacontanol-mediated regulation of growth and other physiological attributes, active constituents and yield of Mentha arvensis L.

et al. 2011

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“…AlaAT assays were performed in the Ala + pyruvate direction, whereas ADH was assayed in ethanol + acetaldehyde as described previously Crosby, 1989a, 1989b). AspAT and MDH activity were assayed by monitoring the oxidation of NADH at 340 nm as described by Griffith and Vance (1989) and Savithiry et al (1992), respectively. AlaDH activity was assayed at 23OC by monitoring the change inA340.…”

Section: Enzyme Assaysmentioning

confidence: 99%

Long-Term Anaerobic Metabolism in Root Tissue (Metabolic Products of Pyruvate Metabolism)

1993

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Vanlerberghe et al. (1990) have recently shown that the green alga Selenastrum minutum accumulates succinate under anaerobic conditions. They demonstrate that the OAA required for reduction to succinate is initially provided by transferring the amino group of aspartate to pymvate to provide a 2-fold increase in ATP yield per hexose as com- One of the difficulties with most of the studies on anaerobic metabolism in plants is that they are restricted to short time intervals, usually a maximum of 12 to 24 h Ranson, 1967% 1967b;Hoffman et al., 1986;Vanlerberghe et al., 1990;Roberts et al., 1992). However, since barley (Hordeum vulgare L.) and maize can usually survive 3 to 5 d of anaerobic stress (Harberd and Edwards, 1982;Lemke-Keyes and Sachs, 1989), it may be the long-term adaptations to anaerobic stress that are more important in determining sensitivity to flooding.In this study, we looked at the long-tem effects of anaeroshort-term effects. We show that although a number of metabolic products, lactate, Ala, malate, and succinate, accumulate during short-term anaerobiosis, they do not continue to increase during long-term anaerobiosis. We also examined the effect on the accumulation of metabolites of reducing both the leve1 of available nitrogen and the accumulation of ethanol by using an ADH-mutant. Finally, we 'Ooked at 'Ome Of the enzYmes involved in and wccinate production to determine whether anY Of these enzYmes are induced der anaerobic COnditions. 1988, 1989).Under hypoxic or anaerobic conditions, there are changes in the levels of glycolytic intermediates in roots and an increased glycolytic flux (the Pasteur effect) (Faiz-ur-Rahman occur so that the cell can meet its requirements for ATP despite the much lower efficiency of ATp production by fermentation. The increase in glycolytic flux &ring hypoxia is accompanied by the accumulation of a number of glycolytic end products including ethanoI, lactate, AIa, and various organic acids and amino acids (Effer and R~~~~~, 196713;Gfeller and Gibbs, 1984;Roberts et al., 1984;Hoffman et al., 1986;Roberts et al., 1992). A number of alternative pathways to lactate and ethanol fermentation have been discovered in animals with high resistance to anoxia. These animals accumulate combinations of a number of end products including Ala, octopine, alanopine, acetate, propionate, 2-methyl-b~-tyrate, and succinate (Fields, 1983). The advantages of these alternative strategies for anaerobic fermentation are based on an increased ATP production per mo1 of substrate fermented, the production of NAD+ to provide a net sink for reductant, and the maintenance of the cellular pH. Davies, 1980

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“…Ries and Houtz (1983) suggested that the hormonal effects of TRIA might be due to TRIA-induced alterations at the membrane level. TRIA-mediated activation of a number of membrane bound enzymes supports this assumption (Ries and Wert 1988;Ries 1991;Savithiry et al 1992). As per Ries et al (1990), TRIA treatment causes rapid elicitation of a specific second messenger, 9-b-L(') adenosine, which could induce extremely rapid physiological responses.…”

Section: Physiological and Biochemical Attributesmentioning

confidence: 57%

“…Moreover, TRIA affected several other enzyme systems especially the membrane bound Ca 2 ' /Mg 2 ' dependent ATPase (Lesniak et al 1986(Lesniak et al , 1989. TRIA also increased the activity of the key respiratory enzyme malate dehydrogenase (Savithiry et al 1992). Ries and Houtz (1983) suggested that the hormonal effects of TRIA might be due to TRIA-induced alterations at the membrane level.…”

Section: Physiological and Biochemical Attributesmentioning

confidence: 99%

Triacontanol: a potent plant growth regulator in agriculture

Naeem

Khan

Moinuddin

2012

Journal of Plant Interactions

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Triacontanol (TRIA) is a natural plant growth regulator found in epicuticular waxes. It is used to enhance the crop production in millions of hectares, particularly in Asia. Quite a number of researchers have reported the TRIA-mediated improvement in growth, yield, photosynthesis, protein synthesis, uptake of water and nutrients, nitrogen-fixation, enzymes activities and contents of free amino acids, reducing sugars, soluble protein, and active constituents of essential oil in various crops. Expectedly, TRIA enhances the physiological efficiency of the cells and, thus, exploits the genetic potential of plant to a large extent. In fact, TRIA increased free amino acids, reducing sugars, and soluble protein of rice (Oryza sativa L.) and maize (Zea mays L.) within 5 min. TRIA elicited the appearance of L(')-adenosine within 1 min in the roots of plants, the shoots of which were sprayed with nanomolar concentrations of TRIA. TRIA and octacosanol (OCTA), the primary alcohols, are ubiquitous in the environment. OCTA was reported to inhibit the activity of TRIA in the seedlings of rice (Oryza sativa L.) at equimolar concentrations; and both TRIA and OCTA elicited a second messenger, known as OCTAM and triacontanol second messenger (TRIM), respectively. TRIA rapidly increases the ratio of L(')-to D(Á)-adenosine, probably at the tonoplast. However, it is to be resolved as to how TRIA elicits L(')-adenosine and what is the source of L(')-adenosine in plants. Based on known metabolic processes, de novo synthesis of L(')-adenosine is unlikely, because of the rapidity of the response. TRIA-mediated increase in dry matter production could influence the inter-relationship between primary and secondary metabolism, leading to increased biosynthesis of secondary products. Various studies present strong evidences that application of TRIA applied either to the root medium or to leaves enhanced the growth and yield of vegetables and other crops, including agronomic and horticultural crops as well as medicinal and aromatic crop plants under normal and adverse conditions. However, further investigations are required to elucidate the possible role of TRIA on plant growth regulation, physiological activities and secondary metabolite biosynthesis regarding medicinal and aromatic plants subjected to abiotic stress. The present review covers the pivotal role of TRIA in plant growth and development, its mode of action and its significance in improving the crop productivity and quality of agricultural crops.

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Influence of 9-beta-L(+)-adenosine on malate dehydrogenase activity in rice

Cited by 6 publications

References 0 publications

Triacontanol-mediated regulation of growth and other physiological attributes, active constituents and yield of Mentha arvensis L.

Triacontanol-mediated regulation of growth and other physiological attributes, active constituents and yield of Mentha arvensis L.

Long-Term Anaerobic Metabolism in Root Tissue (Metabolic Products of Pyruvate Metabolism)

Triacontanol: a potent plant growth regulator in agriculture

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