Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
PHOTOSYNTHESIS, PHOTOINHIBITION AND LOW-TEMPERATURE ACCLIMATION IN COLD TOLERANT PLANTS
Autore:
HUNER NPA; OQUIST G; HURRY VM; KROL M; FALK S; GRIFFITH M;
Indirizzi:
UNIV WESTERN ONTARIO,DEPT PLANT SCI LONDON N6A 5B7 ONTARIO CANADA UNIV WATERLOO,DEPT BIOL WATERLOO N2L 3G1 ONTARIO CANADA UMEA UNIV,DEPT PLANT PHYSIOL S-90187 UMEA SWEDEN
Titolo Testata:
Photosynthesis research
fascicolo: 1, volume: 37, anno: 1993,
pagine: 19 - 39
SICI:
0166-8595(1993)37:1<19:PPALAI>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
PHOTOSYSTEM-II HETEROGENEITY; CHLOROPHYLL FLUORESCENCE KINETICS; PINE PINUS-SYLVESTRIS; ELECTRON-TRANSPORT; WINTER RYE; SCOTS PINE; CHLAMYDOMONAS-REINHARDTII; CARBON METABOLISM; GROWTH TEMPERATURE; SPINACH LEAVES;
Keywords:
PHOTOSYNTHETIC ADJUSTMENT; TEMPERATURE SHIFTS; GROWTH AND DEVELOPMENT; PHOTOINHIBITION; RESISTANCE; REGULATION; ANNUALS; EVERGREENS;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
135
Recensione:
Indirizzi per estratti:
Citazione:
N.P.A. Huner et al., "PHOTOSYNTHESIS, PHOTOINHIBITION AND LOW-TEMPERATURE ACCLIMATION IN COLD TOLERANT PLANTS", Photosynthesis research, 37(1), 1993, pp. 19-39

Abstract

Cold acclimation requires adjustment to a combination of light and low temperature, conditions which are potentially photoinhibitory. The photosynthetic response of plants to low temperature is dependent upon time of exposure and the developmental history of the leaves. Exposureof fully expanded leaves of winter cereals to short-term, low temperature shifts inhibits whereas low temperature growth stimulates electron transport capacity and carbon assimilation. However, the photosynthetic response to low temperature is clearly species and cultivar dependent. Winter annuals and algae which actively grow and develop at low temperature and moderate irradiance acquire a resistance to irradiance 5- to 6-fold higher than their growth irradiance. Resistance to short-term photoinhibition (hours) in winter cereals is a reflection of the increased capacity to keep Q(A) oxidized under high light conditions and low temperature. This is due to an increased capacity for photosynthesis. These characteristics reflect photosynthetic acclimation to lowgrowth temperature and can be used to predict the freezing tolerance of cereals. It is proposed that the enhanced photosynthetic capacity reflects an increased flux of fixed carbon through to sucrose in sourcetissue as a consequence of the combined effects of increased storage of carbohydrate as fructans in the vacuole of leaf mesophyll cells andan enhanced export to the crown due to its increased sink activity. Long-term exposure (months) of cereals to low temperature photoinhibition indicates that this reduction of photochemical efficiency of PS II represents a stable, long-term down regulation of PS II to match the energy requirements for CO2 fixation. Thus, photoinhibition in vivo should be viewed as the capacity of plants to adjust photosynthetically to the prevailing environmental conditions rather than a process which necessarily results in damage or injury to plants. Not all cold tolerant, herbaceous annuals use the same mechanism to acquire resistance tophotoinhibition. In contrast to annuals and algae, overwintering evergreens become dormant during the cold hardening period and generally remain susceptible to photoinhibition. It is concluded that the photosynthetic response to low temperatures and susceptibility to photoinhibition are consequences of the overwintering strategy of the plant species.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 19:28:51