fotosistemas i y ii pdf file. Quote. Postby Just» Tue Aug 28, am. Looking for fotosistemas i y ii pdf file. Will be grateful for any help! Top. of foliage loss, altered leaf orientation, stomatal closure, and photosystem II downregulation. la regulaci6n del fotosistema a la baja en el PSII, mientras que esta conducta TUCKER, C. J., I. Y. FUNG, C. D. KEELING, AND R. H. GAMMON. of foliage loss, altered leaf orientation, stomatal closure, and photosystem II downregulation. la regulación del fotosistema a la baja en el PSII, mientras que esta conducta TUCKER, C. J., I. Y. FUNG, C. D. KEELING, AND R. H. GAMMON.

Author: Aragul Tat
Country: Republic of Macedonia
Language: English (Spanish)
Genre: Music
Published (Last): 27 July 2004
Pages: 175
PDF File Size: 3.29 Mb
ePub File Size: 7.32 Mb
ISBN: 159-9-97388-742-3
Downloads: 28387
Price: Free* [*Free Regsitration Required]
Uploader: Yozshular

Journal of Wine Research 13 2: An actinic pulse of light at 1, m mol m -2 s -1 was used.

Leaf removal creates a negative effect by reducing growth rate, but plants possess a tolerance threshold to defoliation McNaughton, Canadian Journal of Plant Science Biochimica et Biophysica Acta. But, it is possible that some plants initiate io recovery period after defoliation so that the end effect is negligible Fotosisfema et al. Chile produces close to 2, t of grapes, while Argentina leads production on the continent with 2, t Faostat, The value of minimum fluorescence increased by South African Journal of Enology and Viticulture 10 2: Contrary to the findings of the present experiment, it is possible for an increase in photon flow to trigger damage in the D1 protein of PSII, which causes a notable reduction in F o in tree species exposed to increased radiation, due principally to chronic photoinhibition of PSII Dias and Marenco, Thus, there was no positive relation found between chlorophyll content of leaves and their photosynthetic efficiency.


The determination of total chlorophyll content was carried out on six leaves per plant using a CCM Plus chlorophyll meter, while chlorophyll fluorescence measurements were taken with one dark-adapted leaf per plant using a Junior-PAM fluorometer. Response of sunflower plants to physical injury. Fotosisttema Botanici Fennici Advances in Space Research 45 7: Quantum efficiency of Photosystem II in relation to ‘energy’-dependent quenching of chlorophyll fluorescence.

fotosistemas i y ii pdf file – PDF Files

General Subjects 2: Nevertheless, in the past two decades, this crop has been expanding and, in particular, improving in quality. The distribution of energy in these three processes occurs simultaneously, so that an increase in efficiency of one process results in the reduction of the other two. Revista Brasileira de Fisiologia Vegetal 13 2: Energy dissipation as heat Y NPQ showed no significant difference between treatments.

Environmental Entomology 36 3: Figure 3 shows the partitioning of excitation energy in light-adapted plants.

The relationship between the quantum yield of photosynthetic electron transport and quenching of chlorophyll fluorescence. The quality of grapes and wine in relation to geography: It is evident that a reduction in leaf area modifies the partitioning of excitation energy destined for photochemical and fotosiztema processes; and thus, directly influenced the photosynthetic process of the plants evaluated.


This was perhaps due to the fact that fotowistema defoliation induces a quicker response from the plant as a result of the action of insect mandibles on the leaves, thus creating a compensatory response. No se encontraron diferencias significativas para los valores de F mF t y F v. With regards to this result, Otronen and Rosenlund found no significant difference in maximum photochemical quantum yield of PSII when they subjected Pinus sylvestris plants to different levels of defoliation.

Though changes in chlorophyll content are related to photosynthesis, chlorophyll concentration is not always directly proportional to a plant’s photosynthesis rate. Plants lacking the main lightharvesting complex retain photosystem II macro-organization.


Nevertheless, human actions partially or completely modify the behavior of each factor, thus determining the terroir of the vine’s development Vaudour, ; Quijano, This agrees with the results of fotositsema present study, in which the value of Y II decreased in the defoliated plants at the same time as photochemical quenching and maximum quantum yield of PSII.

Karukstis stated that reductions in maximum quantum efficiency of PSII occur simultaneously with a reduction in net ik of CO2, and if this reduction is shown in continuously illuminated leaves, it is possible that the effect is due to photoinhibition. When Ilex aquifolium plants were subjected to a reduction in leaf area, the behavior of maximum quantum yield fluctuated according to the type of defoliation.

Revista Facultad Nacional de Agronomía Medellín

Changes in photochemical efficiency in response to herbivory and experimental defoliation in the dioecious tree Ilex aquifolium. May 12, ; acepted: Accordingly, total production in Colombia is well below that of these countries.

The chlorophyll content fotosistemaa fluorescence were determined in five-year-old grape plants Vitis vinifera L. New fluorescence parameters for the determination of QA redox state and excitation energy fluxes.

Higher plants and UV-B radiation: Compensatory plant-growth as a response to herbivory. Chardonnay that were subjected to early partial defoliation, in Villa de Leyva, Colombia.