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Titolo:
Light penetration via leaf windows does not increase photosynthesis in three species of desert succulents
Autore:
Egbert, KJ; Martin, CE;
Indirizzi:
Univ Kansas, Program Plant Biol, Dept Ecol & Evolutionary Biol, Lawrence, KS 66045 USA Univ Kansas Lawrence KS USA 66045 olutionary Biol, Lawrence, KS 66045 USA
Titolo Testata:
JOURNAL OF PLANT PHYSIOLOGY
fascicolo: 5, volume: 157, anno: 2000,
pagine: 521 - 525
SICI:
0176-1617(200011)157:5<521:LPVLWD>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
CRASSULACEAN ACID METABOLISM; MESEMBRYANTHEMACEAE;
Keywords:
Crassulacean acid metabolism; Haworthia truncata; Lithops olivacea; Peperomia graveolens; windows;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Martin, CE Univ Kansas, Program Plant Biol, Dept Ecol & Evolutionary Biol,Lawrence, KS 66045 USA Univ Kansas Lawrence KS USA 66045 Biol, Lawrence, KS 66045 USA
Citazione:
K.J. Egbert e C.E. Martin, "Light penetration via leaf windows does not increase photosynthesis in three species of desert succulents", J PLANT PHY, 157(5), 2000, pp. 521-525

Abstract

Epidermal windows on leaves may increase the surface area available for light absorption by allowing the transmission of light through the internal succulent, water-storage hydrenchyma and illuminating the chlorenchyma tissue from the inside of the leaf. This would appear to be advantageous by increasing photosynthetic rates in these CAM plants, especially for taxa that grow partially underground in their native habitats. This hypothetical benefit of windows, however, has rarely been experimentally investigated. Thus, net CO2 exchange was measured on plants of Haworthia truncata, Lithops olivacea (both with a below-ground growth habit), and Peperomia graveolens (with an aboveground growth habit) with their windows covered by reflective tape, and the results were compared with plants having unobstructed windows. Despite past assumptions about the function of leaf windows in these succulents, net CO2 exchange and nocturnal accumulations of malic acid were not significantly greater in plants with unobstructed windows.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 14/07/20 alle ore 19:01:20