Factores abióticos involucrados en la facilitación entre leñosas y suculentas en el altiplano mexicano.

Romo-Campos, Rosa de Lourdes; Flores-Flores, José Luis; Flores, Joel; Álvarez-Fuentes, Y Gregorio

doi:10.17129/botsci.11

Cited by 11 publications

(11 citation statements)

References 66 publications

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“…The three cactus species here studied were predawn F v /F m close to 0.83, the typical value found in healthy plants (Björkman and Demmig, 1987;Romo-Campos et al, 2013;Aragón-Gastélum et al, 2014), having no differences between plants with and without spines, which indicate that they can recover after receiving high PPFD.…”

Section: Discussionsupporting

confidence: 60%

Effects of spine-shading on aspects of photosynthesis for three cactus species

2016

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We evaluated the effect of spine removal on three cactus species varying in spine-shading of stems. Turbinicarpus schmiedickeanus showed the greater spine shading (c. 61 %), followed by Mammillaria zephyranthoides (43 %), and Echinocactus platyacanthus (17 %). We evaluated photosynthetic activity [titratable acidity, electron transport rate, potential quantum yield of Photosystem II, effective quantum yield of Photosystem II, and non-photochemical quenching], as well as pigment content (chlorophylls a and b, total chlorophyll, chlorophyll a/b, carotenoids, and total chlorophyll/carotenoids ratio). For T. schmiedickeanus, the species having the higher spine shading, spine removal increased the CAM activity (acidity level) and the effective quantum yield of Photosystem II and diminished both electron transport rate and non-photochemical quenching at 15:00 hours. For M. zephyranthoides, the species having intermediate spine shading, spine removal also increased the acidity level but diminished effective quantum yield of Photosystem II at midday, as well as chlorophyll a, total chlorophyll, and carotenoids, although there was higher non-photochemical quenching (heat quenching) as an adaptation to avoid photosynthetic damage. Spine removal did not affect acidity level or pigment content from E. platyacanthus, the species having the lower spine shading; however, at midday this species without spines showed a decrease of effective quantum yield of Photosystem II, as well as an increase of non-photochemical quenching and electron transport rate. We suggest that a main function of cactus spines is reduction of sun exposure to avoid damage to the photosynthetic apparatus.

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Section: Discussionsupporting

confidence: 60%

Effects of spine-shading on aspects of photosynthesis for three cactus species

2016

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“…Modifications in chlorophyll a fluorescence, under stress conditions, occur when enzymes responsible for carbon reduction are damaged and the electron transport is inhibited, which suggests there is a reduction in the amount of energy used by the plant for photochemical processes, as observed in Opuntia jaliscana under dry climate and low humidity conditions (Romo-Campos et al, 2013). In addition, under conditions of drought, heat stress and radiation, the chlorenchyma loses significant amount of water and the cladode begins to exhibit rough aspect and loss of its characteristic green color (Becerril & Valdivia, 2006), indicating loss of chlorophyll (Pimienta-Barrios et al, 2005).…”

Section: Resultsmentioning

confidence: 99%

“…Chlorophyll a fluorescence has allowed inferences on the efficiency of the photochemical phase of photosynthesis and can be useful in studies on the physiological behavior of CAM plants (Romo-Campos et al, 2013;Cruz et al, 2014;Díez et al, 2017). Thus, it can help understand the adaptability and resistance to drought of cactus pear in the soil-plantatmosphere production context of the semi-arid region.…”

Section: Introductionmentioning

confidence: 99%

Photochemical efficiency in cladodes of ‘Gigante’ cactus pear cultivated under different spacings and organic fertilization

Puiatti

Donato

Arantes

et al. 2018

Rev. bras. eng. agríc. ambient.

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A B S T R A C TThe objective of this study was to determine the photochemical efficiency of 'Gigante' cactus pear cultivated under different spacings and bovine manure doses in the semi-arid region. The experiment was conducted in a randomized block design in a 4 x 3 x 7 factorial scheme, with three replicates. The first factor consisted of four doses of organic fertilization (0, 30, 60 and 90 Mg ha -1 year -1 of bovine manure), the second one, of three spacings (1.0 x 0.5, 2.0 x 0.25 and 3.0 x 1.0 x 0.25 m) and the third one of seven reading times (6, 8, 10, 12, 14, 16 and 18 h). Chlorophyll a fluorescence readings were taken in cactus pear cladodes in the dry and rainy seasons using a pulse-modulated fluorometer. Cladodes of 'Gigante' cactus pear cultivated under different spacings and bovine manure doses undergo changes in photosystem II during the dry season under the physiographic conditions of the semiarid region in Bahia. During the rainy season in the semi-arid region, the photosynthetic yield in cactus pear cladodes is considered ideal.Eficiência fotoquímica em cladódios de palma forrageira 'Gigante' cultivada sob diferentes espaçamentos e adubação orgânica R E S U M OObjetivou-se determinar a eficiência fotoquímica da palma forrageira 'Gigante' cultivada sob diferentes espaçamentos e doses de esterco bovino na região semiárida. O experimento foi conduzido em blocos ao acaso em esquema fatorial 4 x 3 x 7, com três repetições. O primeiro fator foi constituído de quatro doses de adubação orgânica (0; 30; 60 e 90 Mg ha -1 ano -1 de esterco bovino), o segundo, por três espaçamentos (1,0 x 0,5; 2,0 x 0,25 e 3,0 x 1,0 x 0,25 m) e o terceiro por sete horários de leitura (6; 8; 10; 12; 14; 16 e 18 h). Foram realizadas leituras de fluorescência da clorofila a em cladódios de palma forrageira nas épocas seca e chuvosa com auxílio de um fluorômetro de luz modulada. Os cladódios de palma forrageira 'Gigante' cultivada sob diferentes espaçamentos e doses de esterco bovino sofrem alterações no fotossistema II na época seca nas condições fisiográficas do semiárido baiano. Na época de chuvas na região semiárida o rendimento fotossintético em cladódios de palma forrageira é considerado ideal. Key words:Opuntia arrangement of plants chlorophyll fluorescence Palavras-chave: Opuntia arranjo de plantas fluorescência da clorofila

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“…streptacantha is lower than that of O . jaliscana [ 27 , 57 ]. The above suggests that these plants tend to be of relatively slow growth.…”

Section: Discussionmentioning

confidence: 99%

Continuous high and low temperature induced a decrease of photosynthetic activity and changes in the diurnal fluctuations of organic acids in Opuntia streptacantha

2017

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Opuntia plants grow naturally in areas where temperatures are extreme and highly variable in the day during the entire year. These plants survive through different adaptations to respond to adverse environmental conditions. Despite this capability, it is unknown how CAM photosynthetic activity and growth in Opuntia plantlets is affected by constant heat or cold. Therefore, the main objective of this research was to evaluate the short-term effect of high (40°C) and low (4°C) continuous temperatures on the photosynthetic efficiency, the organic acid content (malic acid) and the relative growth rate (RGR) in seven-month-old Opuntia streptacantha plantlets during 5, 10, and 15 days. Chlorophyll fluorescence analysis allowed us to determine that high temperatures negatively impact the photosynthetic efficiency of O. streptacantha plantlets, which exhibited the lowest values of maximum quantum efficiency of the photosystem II (Fv/Fm = 52%, Fv/F0 = 85%), operational quantum yield of PS (ΦPSII = 65%) and relative electron transport rate (rETR = 65%), as well as highest values of basal fluorescence (F0 = 226%) during 15 days of treatment. Similarly, low temperatures decreased Fv/Fm (16%), Fv/F0 (50%), ΦPSII and rETR (16%). High temperatures also decreased nocturnal acidification in approximately 34–50%, whereas low temperatures increased it by 30–36%. Additionally, both continuous temperatures affected drastically diurnal consumption of malic acid, which was related to a significant RGR inhibition, where the specific photosynthetic structure area component was the most affected. Our results allowed determining that, despite the high tolerance to extreme temperatures described for Opuntia plants, young individuals of O. streptacantha suffered photosynthetic impairment that led to the inhibition of their growth. Thus, the main findings reported in this study can help to predict the potential impact of climatic change on the establishment and survival of succulent species of arid and semiarid regions of Mexico.

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Factores abióticos involucrados en la facilitación entre leñosas y suculentas en el altiplano mexicano.

Cited by 11 publications

References 66 publications

Effects of spine-shading on aspects of photosynthesis for three cactus species

Effects of spine-shading on aspects of photosynthesis for three cactus species

Photochemical efficiency in cladodes of ‘Gigante’ cactus pear cultivated under different spacings and organic fertilization

Continuous high and low temperature induced a decrease of photosynthetic activity and changes in the diurnal fluctuations of organic acids in Opuntia streptacantha

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