Fotoinhibición: Respuesta fisiológica de los vegetales al estrés por exceso de luz

Casierra–Posada, Fánor

doi:10.17584/rcch.2007v1i1.1150

Cited by 14 publications

(12 citation statements)

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“…In this regard, Baker (2008) mentions that in many ecophysiological studies it is suggested that the decreases found in the value of Fv/Fm as a consequence of the exposure of the plants to some stressor, imply that the photosynthetic efficiency of the leaves in light conditions was affected. In this sense, the Fv/Fm coefficient has been widely used as an indicator of photoinhibition of photosynthesis (Maxwell & Johnson, 2000;Casierra-Posada, 2007;Baker, 2008). Moreover, according to Mohammed et al (2003), the value of this variable in healthy plants should be in the range of 0,83-0,76, which was the value of the Fv/Fm measured in the control plants in the present work.…”

Section: Resultsmentioning

confidence: 77%

Photosystem II fluorescence and growth in cabbage plants (Brassica oleracea var. capitata) grown under waterlogging stress

Casierra–Posada

Cutler

2017

Rev. U.D.C.A Act. & Div. Cient.

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Waterlogging stress is a limiting factor in the production of crops grown in localities with high rainfall frequency. Waterlogging causes a decrease in the availability of O2 in roots, which substantially affects the anatomy, morphology and metabolism of plants. Oxygen deficiency inhibits mitochondrial respiration, oxidation, and oxygenation processes, causing severe affection of plant metabolism. A test in greenhouse conditions was carried out in Tunja, Colombia, in order to evaluate the effect of waterlogging on the growth of cabbage plants (Brassica oleracea var. capitata). Some plants were waterlogged for 25 days and their physiological response was compared with plants maintained at field capacity. As consequence of waterlogging, leaf area, total dry weight, chlorophyll content, leaf area ratio, absolute growth rate and relative growth rate were reduced. In addition, necrotic plants exhibited a high percentage of necrosis in the leaves. As for the variables related to chlorophyll fluorescence, there was a decrease of 17,9, 50,0 and 36,0% in the Fv/Fm values, ΦPSII and qP, respectively. All of these results indicate low tolerance of cabbage plants to waterlogging.

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Section: Resultsmentioning

confidence: 77%

Photosystem II fluorescence and growth in cabbage plants (Brassica oleracea var. capitata) grown under waterlogging stress

Casierra–Posada

Cutler

2017

Rev. U.D.C.A Act. & Div. Cient.

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“…Maximum photochemical efficiency of PSII, represented by the ratio Fv/Fm, corresponded to the normal range in both treatments, as values for this parameter from 0.78 to 0.85 are associated with healthy, unstressed plants (Percival, 2004;Demmig-Adams & Adams, 2006). Nevertheless, the comparison of this ratio between the two treatments shows a slightly, though statistically significant, lower value for full sun plants, which implies that full sun exposure leads to some degree of plant stress, possibly caused by the higher incidence of UV radiation (Casierra-Posada, 2007). In addition it must be noted that fluorescence were measured at 13:00 h, when the noontime radiation is strong, as seen in figure 1.…”

Section: Chlorophyll a / Chlorophyll B Ratiomentioning

confidence: 93%

Shade tolerance of marigold plants (Calendula officinalis)

Casierra–Posada

Ávila-León²

2015

Rev. U.D.C.A Act. & Div. Cient.

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Pot marigold (Calendula officinalis L.) is the second most commonly-sold medicinal herb in Colombia. The study was performed in Tunja, Colombia, in which chlorophyll and carotenoid content were evaluated in pot marigold grown under low and high light conditions (35% and 100% of full daylight). Chlorophyll fluorescence parameters and electron transport rate were also evaluated. Compared to full sun plants, shaded plants had a higher ratio of chlorophyll a to chlorophyll b, and a lower ratio of carotenoids to chlorophyll. Values for maximum fluorescence (Fm), variable fluorescence (Fv), and maximum quantum efficiency of photosystem II (the ratio Fv/Fm) increased in shaded plants, while electron transport rate was reduced. These results suggest that pot marigold plants are very sensitive to low-light conditions.

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“…C. vulgaris has been shown to be a species of microalgae with which high yields of primary and secondary metabolites can be had; However, it has been observed that, due to its adaptability, it can respond differently when exposed to different factors during its growth, which is why the ones evaluated so far and the influence it has on the growth of the microalgae (Casierra-Posada, 2007).…”

Section: Factors Influencing Growthmentioning

confidence: 99%

“…When photosynthetic organisms do not have organic carbon sources, their main way of obtaining energy is through light, which as the intensity increases, the products generated from photosynthesis also increase; However, there is a maximum point at which organisms absorb energy and if this point is exceeded, a phenomenon known as photoinhibition is suffered (Seyfabadi et al, 2011) which is defined as the inhibition of photosynthesis due to excess radiation that directly affects production, indicating that the photosynthetic organism is under stress. Photo inhibition may be reversible (Casierra-Posada, 2007).…”

Section: Lightmentioning

confidence: 99%

Chlorella vulgaris, a microalgae important to be used in Biotechnology: a review

et al. 2022

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Chlorella vulgaris is a microalgae belonging to the order of the Chlorococcales, of the Oocytaceae family, of the genus Chlorella, which has a green colour due to the chloroplasts it contains. Its shape is spherical with a size that varies from 1 to 10 microns. These microalgae contain, in addition to chlorophyll, a significant amount of intracellular proteins, carbohydrates, lipids, vitamin C, β-carotenes and B vitamins (B1, B2, B6 and B12), which is why it is commonly used for the preparation of food supplements, as well as for the production of cosmetics, clinical treatments and even for the detoxification of heavy metals in wastewater. For this reason, the following review speaks from the morphology of the microalgae C. vulgaris to recent investigations regarding the primary and secondary metabolites. This research also provides an overview of the areas of opportunity for the development of new products and process improvements in order to increase the existing yields so far to optimize responses based on the desired products, the formulation of various growth media or the design of new photobioreactors which allow greater control of growth conditions and easy scaling for high productions at the industrial level that cover the current global needs.

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Fotoinhibición: Respuesta fisiológica de los vegetales al estrés por exceso de luz

Cited by 14 publications

References 0 publications

Photosystem II fluorescence and growth in cabbage plants (Brassica oleracea var. capitata) grown under waterlogging stress

Photosystem II fluorescence and growth in cabbage plants (Brassica oleracea var. capitata) grown under waterlogging stress

Shade tolerance of marigold plants (Calendula officinalis)

Chlorella vulgaris, a microalgae important to be used in Biotechnology: a review

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