Delayed leaf senescence by exogenous lyso phosphatidylethanolamine: towards a mechanism of action
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Delayed leaf senescence by exogenous lyso phosphatidylethanolamine: towards a mechanism of action
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| Id. |
45130176 |
| Titulo |
Delayed leaf senescence by exogenous lyso phosphatidylethanolamine: towards a mechanism of action |
| Autor(es) |
Hong, J.H.
Chung, G.
Cowan, A.K.
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| Localización |
http://eprints.ru.ac.za/1410/
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| Versión |
1.0 |
| Estado |
Final
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| Descripción |
Exogenous application of the lysophospholipid, lyso-phosphatidylethanolamine (LPE) is purported to delay leaf senescence in plants. However, lyso-phospholipids are well known to possess detergent-like activity and application of LPE to plant tissues might be expected to rather elicit a wound-like response and enhance senescence progression. Since phosphatidic acid (PA) accumulation and leaf cell death are a consequence of wounding, PA- and hormone-induced senescence was studied in leaf discs from Philodendron cordatum (Vell.) Kunth plants in the presence or absence of egg-derived 18:0-LPE and senescence progression quantified by monitoring both lipid peroxidation (as the change in malondialdehyde concentration), and by measuring retention of total chlorophyll (Chla+b) and carotenoids (Cc+x). Only abscisic acid (ABA) stimulated lipid peroxidation whereas ABA, 1-aminocyclopropane-1-carboxylic acid (ACC), the immediate precursor to ethylene (ETH), and 16:0-18:2-PA stimulated loss of chloroplast pigments. Results using primary alcohols as attenuators of the endogenous PA signal confirmed a role for PA as an intermediate in both ABA- and ETH-mediated senescence progression. Exogenous 18:0-LPE did not appear to influence senescence progression and was unable to reverse hormone-induced senescence progression. However, when supplied together with 16:0-18:2-PA at 1:1 (mol:mol), activity of phosphatidylglycerol (PG) hydrolase, chlorophyllase (E.C. 3.1.1.14), and progression of leaf senescence were negated. This apparent anti-senescence activity of exogenous 18:0-LPE was associated with induction of the pathogenesis-related protein, extracellular acid invertase (Ac INV, E.C. 3.2.1.26) suggesting that 18:0-LPE like 16:0-18:2-PA functions as an elicitor.
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| Tipo |
application/pdf
application/pdf
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| Palabras clave |
Environmental Biotechnology Research Unit (EBRU)
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| Tipo de recurso |
Article
PeerReviewed
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| Tipo de Interactividad |
Expositivo
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| Nivel de Interactividad |
muy bajo
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| Audiencia |
Estudiante
Profesor
Autor
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| Estructura |
Atomic |
| Coste |
no
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| Copyright |
sí
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| Formatos |
application/pdf
application/pdf
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| Requerimientos técnicos |
Browser: Any
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| Relación |
[References] http://eprints.ru.ac.za/1410/01/Cowan_PPB_figs.pdf
[References] http://eprints.ru.ac.za/1410/02/Cowan_Text_Delayed_leaf.pdf
[References] http://dx.doi.org/10.1016/j.plaphy.2008.12.014
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| Fecha de contribución |
02-jul-2009 |
| Contacto |
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