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The leaf of Agapant...
The leaf of Agapanthus africanus (L.) Hoffm. : A physical-chemical perspective of terrestrialization in the cuticle
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- Nunes, P. (author)
- Univ Tras Os Montes & Alto Douro UTAD, CQ VR, P-5000811 Vila Real, Portugal.
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- Nunes, S. C. (author)
- Univ Beira Interior, Chem Dept, P-6201001 Covilha, Portugal.;Univ Beira Interior, FibEnTech Fiber Mat & Environm Technol, P-6201001 Covilha, Portugal.
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- Pereira, R. F. P. (author)
- Univ Minho, Chem Dept, Braga, Portugal.;Univ Minho, Chem Ctr, Braga, Portugal.
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- Cruz, R. (author)
- Univ Porto, LAQV REQUIMTE, Dept Chem Sci, Fac Pharm,Lab Bromatol & Hydrol, P-4050313 Porto, Portugal.
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- Rocha, J. (author)
- Univ Tras Os Montes & Alto Douro UTAD, CQ VR, P-5000811 Vila Real, Portugal.;UTAD, Herbarium & Bot Garden, P-5000811 Vila Real, Portugal.
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- Ravishankar, Ajith Padyana (author)
- KTH,Fotonik
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- Fernandes, L. (author)
- Univ Tras Os Montes & Alto Douro UTAD, CQ VR, P-5000811 Vila Real, Portugal.;UTAD, CIDE UME, P-5000811 Vila Real, Portugal.
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- Bacelar, E. (author)
- UTAD, CITAB, Ctr Res & Technol Agroenvironm & Biol Sci, Dept Biol & Environm,Sch Life Sci & Environm, P-5000801 Vila Real, Portugal.
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- Casal, S. (author)
- Univ Porto, LAQV REQUIMTE, Dept Chem Sci, Fac Pharm,Lab Bromatol & Hydrol, P-4050313 Porto, Portugal.
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- Deka, Shankar, 1993- (author)
- KTH,Albanova VinnExcellence Center for Protein Technology, ProNova,Tillämpad fysik
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- Crespi, A. L. (author)
- UTAD, Herbarium & Bot Garden, P-5000811 Vila Real, Portugal.;UTAD, CITAB, Ctr Res & Technol Agroenvironm & Biol Sci, Dept Biol & Environm,Sch Life Sci & Environm, P-5000801 Vila Real, Portugal.
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- Fernandes, M. (author)
- Univ Tras Os Montes & Alto Douro UTAD, CQ VR, P-5000811 Vila Real, Portugal.;UTAD, Dept Chem, P-5000811 Vila Real, Portugal.
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- Bermudez, V. de Zea (author)
- Univ Tras Os Montes & Alto Douro UTAD, CQ VR, P-5000811 Vila Real, Portugal.;UTAD, Dept Chem, P-5000811 Vila Real, Portugal.
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Univ Tras Os Montes & Alto Douro UTAD, CQ VR, P-5000811 Vila Real, Portugal Univ Beira Interior, Chem Dept, P-6201001 Covilha, Portugal.;Univ Beira Interior, FibEnTech Fiber Mat & Environm Technol, P-6201001 Covilha, Portugal. (creator_code:org_t)
- Elsevier BV, 2023
- 2023
- English.
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In: Environmental and Experimental Botany. - : Elsevier BV. - 0098-8472 .- 1873-7307. ; 208
- Related links:
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Subject headings
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- Although Agapanthus africanus (L.) Hoffm. is one of the most popular ornamental species in both hemispheres, it has an extremely restricted wild occurrence (Cape province, South Africa). This contradiction between gener-alized ornamental application and natural distribution was the basis for the analytical approach adopted in the present work. We hypothesized that characteristic features of the cuticular waxes were adopted by this species to help it cope with severe dehydration associated with marine salinity on account of the short distance of the wild populations to the sea. A comprehensive morpho-anatomical, histological and physical-chemical analysis was performed on the epicuticular and intracuticular layers of the adaxial and abaxial surfaces of leaves of specimens of A. africanus. The adaxial epicuticular surface is hydrophilic and the abaxial epicuticular surface exhibits globally hydrophobic behavior. The main chemical compounds detected in the wax layers of both surfaces of the leaf are the short-chain monocaprylin monoglyceride (C8), and very long-chain 1-hexacosanol (C26) and 1-octa-cosanol (C28) alcohols. While monocaprylin is particularly abundant in the intracuticular layers, the epicuticular adaxial surface revealed the highest concentration of both alcohols. We demonstrate that the smart combination of these two classes of molecules with opposite water affinity endows the A. africanus leaf cuticle with a unique water management system combining the efficient entrapment of water in the disordered alpha-gel phase formed by monocaprylin and the high resistance to water transport provided by ordered domains composed of tightly packed, all-trans alkyl chains of the above pair of alcohols. The remarkable structural similarity existing between the monocaprylin alpha-gel and the mucilage of algae is an evidence of the terrestrialization process.
Subject headings
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
Keyword
- Leaf
- Cuticle
- Wax
- Monocaprylin?-gel
- 1-Hexacosanol
- 1-Octacosanol
- Sclerophyllization
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Nunes, P.
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Nunes, S. C.
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Pereira, R. F. P ...
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Cruz, R.
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Rocha, J.
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Ravishankar, Aji ...
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show more...
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Fernandes, L.
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Bacelar, E.
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Casal, S.
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Deka, Shankar, 1 ...
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Crespi, A. L.
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Fernandes, M.
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Bermudez, V. de ...
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
- Articles in the publication
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Environmental an ...
- By the university
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Royal Institute of Technology