Effects of ethylene diurea as a protective antiozonant on beans (Phaseolus vulgairs CV LIT) exposed to different tropospheric ozone doses in Catalonia (NE Spain).

Ribas A, Peñuelas J (2000) Effects of ethylene diurea as a protective antiozonant on beans (Phaseolus vulgairs CV LIT) exposed to different tropospheric ozone doses in Catalonia (NE Spain). Water, Air, and Soil Pollution 117:263-271.

Remote sensing of biomass and yield of winter wheat under different nitrogen supplies.

Serrano L, Filella I, Peñuelas J (2000) Remote sensing of biomass and yield of winter wheat under different nitrogen supplies. Crop Science 40:723-731.

Seasonal patterns of terpene content and emission from seven Mediterranean woody species in field conditions.

Llusià J, Peñuelas J (2000) Seasonal patterns of terpene content and emission from seven Mediterranean woody species in field conditions. American Journal of Botany 87:133-140.

Deriving water content of chaparral vegetation from AVIRIS data.

Serrano L, Ustin SL, Roberts DA, Gamon JA, Peñuelas J (2000) Deriving water content of chaparral vegetation from AVIRIS data. Remote Sensing of the Environment 74:570-581.

Comparative field water relations of three Mediterranean shrub species co-occurring at a natural CO2 vent.

Tognetti R, Minnocci A, Peñuelas J, Raschi A, Jones MB (2000) Comparative field water relations of three Mediterranean shrub species co-occurring at a natural CO2 vent. Journal of Experimental Botany 51:1135-1146.

Estimation of canopy photosynthetic and nonphotosynthetic components from spectral transmittance.

Serrano L, Gamon JA, Peñuelas J (2000) Estimation of canopy photosynthetic and nonphotosynthetic components from spectral transmittance. Ecology 81:3149-3162.

Reflectance assessment of canopy CO2 uptake.

Peñuelas J, Inoue Y (2000) Reflectance assessment of canopy CO2 uptake. International Journal of Remote Sensing 21:3353-3356.

Effects of a severe drought on water and nitrogen use by Quercus ilex and Phillyrea latifolia.

Peñuelas J, Filella I, Piñol J, Siscart D, Lloret F (2000) Effects of a severe drought on water and nitrogen use by Quercus ilex and Phillyrea latifolia. Biologia Plantarum 43:47-53.

Comparative photochemical and phenomorphological responses to winter stress of an evergreen (Quercus ilex L.) and a semi-deciduous (Cistus albidus L.) Mediterranean woody species

Oliveira G., Peñuelas J. (2000) Comparative photochemical and phenomorphological responses to winter stress of an evergreen (Quercus ilex L.) and a semi-deciduous (Cistus albidus L.) Mediterranean woody species. Acta Oecologica. 21: 97-107.
Enllaç
Doi: 10.1016/S1146-609X(00)00121-1

Resum:

The impact of winter stress on plants from a Mediterranean area was evaluated through comparison of photosystem II (PS II) efficiencies and phenomorphological characteristics of two Mediterranean woody species - Quereus ilex (evergreen) and Cistus albidus (semi-deciduous). The studies were carried out in NE Spain, at two sites with different mean winter temperatures. The results showed that reductions of the efficiency of PS II may occur in Mediterranean plant communities during winter, and are especially remarkable on colder days. The extent and duration of the decrease in PS II efficiency (photoinhibition) depended not only on the climatic conditions, but also on the site, on the species considered and on the position of leaves in the plant canopy. Increased photoinhibition at the colder site was only clear for C. albidus. Nevertheless, the efficiencies of PS II were always higher in C. albidus than in Q. ilex. Phenological patterns, morphology and leaf inclination may protect C. albidus leaves from potentially photoinhibitory conditions in winter. Morphological and structural photoprotection is apparently not so well developed in Q. ilex, which probably relies more on increased protection at the photochemical level of its long-lived leaves. As has been reported in relation to summer-drought stress, Q. ilex has possibly developed a strategy of tolerance to photoinhibition, whereas C. albidus relies preferentially on avoidance features. (C) 2000 Editions scientifiques et medicales Elsevier SAS.

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