Photosynthesis, growth, and survival in seedlings of four tropical fruit-tree species under intense radiation

Ortiz, Daniel; Moreno, Flávio; Díez, María Claudia

doi:10.1590/1809-4392202000752

Cited by 6 publications

(7 citation statements)

References 31 publications

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“…Guava (Psidium guajava) seedlings 2 days after UV-B application and UV-B absent showed higher maximum quantum productivity of photosystem II (Fv/Fm) relative to plants evaluated 30 days after (Figure 1A). However, the results remained within the expected range for the species as found by Ortiz et al [53], around 0.7 and 0.8. The application of UV-B radiation caused dynamic photoinhibition in guava seedlings in the present study.…”

Section: Fluorescence Of Chlorophyll Asupporting

confidence: 85%

UV-B Radiation in the Acclimatization Mechanism of Psidium guajava in Sunlight

Campos,

Dantas,

Santos

et al. 2023

Horticulturae

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The ozone layer (O3) is essential to the absorption and blocking of UV-B radiation, preventing a large portion from reaching the Earth’s surface. The degradation of the ozone layer (O3) caused by increased pollution has led to climate change exerting significant influence on natural ecosystems and has resulted in severe stress on the environment, such as an increase in UV-B radiation, which has deleterious effects on plant physiology. UV-B influences the protection pathways that increase compound production, leading to metabolic adjustments and promoting plant acclimatization. This study evaluated whether UV-B application prior to sunlight exposure induces anthocyanin synthesis, photochemical change, and carbohydrate profile modification, contributing to acclimatization in Psidium guajava seedlings. A higher concentration of H2O2 may have stimulated anthocyanin synthesis. Furthermore, greater instantaneous water use efficiency (iWUE), the absence of trehalose—a stress marker, and lower concentrations of glucose, fructose, and sucrose indicate that these plants acclimatize when exposed to full sun (30 days). Seedlings exposed to increased UV-B may be more resistant to the climate. The radiation can aid in water resource management with elevated carbohydrate concentrations. These conditions may enhance the success of P. guajava in the field. Therefore, it is suggested that UV-B application to seedlings of P. guajava promotes effective acclimatization, as it activates anthocyanin synthesis, inhibits trehalose accumulation, and increases iWUE. UV-B radiation, depending on its radiance, can be used as a technique in seedling production that can be implanted in anthropic environments.

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Section: Fluorescence Of Chlorophyll Asupporting

confidence: 85%

UV-B Radiation in the Acclimatization Mechanism of Psidium guajava in Sunlight

Campos,

Dantas,

Santos

et al. 2023

Horticulturae

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“…Las poblaciones de individuos que conforman una especie vegetal están bajo una continua interacción de adaptación, donde intervienen factores físicos, biológicos, bioquímicos y anatómicos, por ello cada especie adapta la información contenida en el genoma de acuerdo con sus necesidades (Ortiz et al,2021). Resultado de lo anterior es la acumulación de la información genética que cada especie guarda entre los miembros de su población y lo transmite a las subsiguientes generaciones a través del tiempo; de esta manera, aunque la población de una especie comparte características comunes pueden presentar muchas variantes individuales, las cuales se denomina variabilidad genética, esto permite a cada especie adaptarse a los cambios que se presentan en su entorno (Sandoya, 2019).…”

Section: Introductionunclassified

Estudio morfoagronómico de materiales de cacao (Theobroma cacao L.) de diferentes zonas productoras en Colombia

Hernández¹,

Aldana

Lozano³

et al. 2021

Cien. Agri.

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Las características de los productos agrícolas están influenciadas por el ecosistema desde la perspectiva de los factores bióticos y abióticos, lo cuales producen en la planta respuestas fisiológicas y a su vez en los frutos propiedades fisicoquímicas únicas, que son la base para las denominaciones de origen y estrategias de agregación de valor al producto en el mercado actual. En el presente trabajo se caracterizaron morfoagronómicamente diez materiales de cacao (Theobroma cacao L.) que fueron seleccionados por su destacada productividad (FSV41, FLE3, FEAR5, FSA12, FEC2, SCC23, SCC80, SCC55, ICS95 y CCN51), los cuales fueron establecidos en departamentos como Santander (931 m s. n. m.), Huila (885 m s. n. m.) y Arauca (204 m s. n. m.), principales zonas productoras de cacao en Colombia. Para la evaluación de las características físicas de materiales recolectados se utilizaron 21 descriptores cuantitativos encargados de definir la variabilidad física del fruto según el clon y el lugar donde se recolecto. Los datos recolectados fueron analizados mediante la matriz de correlación de Pearson y análisis de componentes principales, logrando identificar aquellos descriptores que más aportan a la variabilidad entre materiales (índice de mazorca, relación longitud diámetro, peso y diámetro de semilla y peso y longitud de fruto). Además, se pudo comprobar el efecto del lugar de cosecha sobre las características físicas de los materiales resaltando la importancia del estudio de adaptación previo a la siembra del material de cacao, con el objetivo de garantizar una cosecha de cacao Premium, productiva y de calidad para la industria, que compita en el mercado.

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“…Thus, one same species is frequently classified in different successional groups. Ortiz et al. (2021) observed in their review that the functional characteristics of leaves vary between pioneer and late-successional species and that, among other traits, photosynthetic capacity and tolerance to photoinhibition are of great scientific interest ( Yang et al., 2020 ).…”

Section: Introductionmentioning

confidence: 99%

“…However, late-successional species are prone to chlorophyll degradation, exhibiting photoinhibition and presenting an irreversible decline in the maximum photochemical efficiency of PSII (F v /F m ) when absorbing more light than necessary for carbon assimilation. In addition, late-successional species present lower Rubisco contents, which can eventually compromise plant survival ( Yang et al., 2020 ; Ortiz et al., 2021 ).…”

Section: Introductionmentioning

confidence: 99%

How does shading mitigates the water deficit in young Hymenaea courbaril L. plants?

Reis,

Scalon,

Foresti

et al. 2023

Front. Plant Sci.

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Information on tolerance to isolated or combined abiotic stresses is still scarce for tree species, although such stresses are normal in nature. The interactive effect of light availability and water stress has been reported for some native tree species in Brazil but has not been widely investigated. To test the hypothesis that shading can mitigate the stressful effect of water deficit on the photosynthetic and antioxidant metabolism and on the growth of young Hymenaea courbaril L. plants, we evaluated the following two water regimes: a) continuous irrigation – control (I) - 75% field capacity. and b) water deficit (S), characterized by irrigation suspension associated the two following periods of evaluation: P0 - when the photosynthetic rate of plants subjected to irrigation suspension reached values close to zero, with the seedlings being re-irrigated at that moment, and REC - when the photosynthetic rate of the re-irrigated plants of each shading levels reached values similar to those of plants in the control treatment, totaling four treatments: IP0, SP0, IREC, and SREC. The plants of these four treatments were cultivated under the four following shading levels: 0, 30, 50, and 70%, constituting 16 treatments. Intermediate shading of 30 and 50% mitigates the water deficit and accelerates the recovery of H. courbaril. Water deficit associated with cultivation without shading (0%) should not be adopted in the cultivation or transplantation of H. courbaril. After the resumption of irrigation in the REC, the other characteristics presented a recovery under all cultivation conditions. Key message: Intermediate shading of 30 and 50% mitigates the water deficit and accelerates the recovery of H. courbaril.

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Photosynthesis, growth, and survival in seedlings of four tropical fruit-tree species under intense radiation

Cited by 6 publications

References 31 publications

UV-B Radiation in the Acclimatization Mechanism of Psidium guajava in Sunlight

UV-B Radiation in the Acclimatization Mechanism of Psidium guajava in Sunlight

Estudio morfoagronómico de materiales de cacao (Theobroma cacao L.) de diferentes zonas productoras en Colombia

How does shading mitigates the water deficit in young Hymenaea courbaril L. plants?

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