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Titolo:
Short-term impacts of enhanced UV-B radiation on photo-assimilate allocation and metabolism: a possible interpretation for time-dependent inhibition of growth
Autore:
Gwynn-Jones, D;
Indirizzi:
Univ Wales, Inst Biol Sci, Aberystwyth SY23 3DA, Ceredigion, Wales Univ Wales Aberystwyth Ceredigion Wales SY23 3DA 3 3DA, Ceredigion, Wales
Titolo Testata:
PLANT ECOLOGY
fascicolo: 1-2, volume: 154, anno: 2001,
pagine: 65 -
SICI:
1385-0237(200106)154:1-2<65:SIOEUR>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
ARCTIC HEATH ECOSYSTEM; ULTRAVIOLET-RADIATION; MAINTENANCE RESPIRATION; NITROGEN-CONTENT; PLANTS; PHOTOSYNTHESIS; RICE; SEEDLINGS; IRRADIANCES; IRRADIATION;
Keywords:
growth; maintenance respiration; protection; repair; source-sink relations; UV-B;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
57
Recensione:
Indirizzi per estratti:
Indirizzo: Gwynn-Jones, D Univ Wales, Inst Biol Sci, Aberystwyth SY23 3DA, Ceredigion, Wales Univ Wales Aberystwyth Ceredigion Wales SY23 3DA on, Wales
Citazione:
D. Gwynn-Jones, "Short-term impacts of enhanced UV-B radiation on photo-assimilate allocation and metabolism: a possible interpretation for time-dependent inhibition of growth", PLANT ECOL, 154(1-2), 2001, pp. 65

Abstract

To test the hypothesis that plant source-sink relations are important in determining response to UV-B radiation, a short-term (45 d) field experimentwas conducted at Abisko Scientific Research Station, Abisko, Sweden (68 degrees N). Tillers of the grass Calamagrostis purpurea were grown outdoors at levels of UV-B radiation representing 25% ozone depletion. Growth, respiration, photo-assimilate allocation and UV-B protective compounds were subsequently measured. There were no significant effects of enhanced UV-B on total plant dry weight, leaf area, Shoot: Root ratio, leaf weight ratio, leaf area ratio, specific leaf area, tiller number per plant or blade thickness of this species. However, the amount of UV-B absorbing compounds and respiration rates were significantly increased in young and mature leaves. Increases in leaf respiration were accompanied by alterations in plant carbohydrate allocation at enhanced UV-B. The amount of soluble root carbohydrates was reduced following UV-B exposure. Enhanced UV-B also caused increases in the soluble sugar:starch ratio of young leaves, the stem and total aboveground biomass. The importance of source-sink relations and constitutive versus induced defenseare discussed in relation to UV-B response.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/03/20 alle ore 15:17:35