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Wyszukujesz frazę "Herrera, Raúl" wg kryterium: Autor


Wyświetlanie 1-3 z 3
Tytuł:
Changes in Chlorophyll a fluorescence and DNA as a plant response to UV-B radiation in Gnaphalium vira-vira
Autorzy:
Cuadra, Pedro
Fajardo, Víctor
Pimentel, Paula
Moya-Leon, M. Alejandra
Herrera, Raúl
Powiązania:
https://bibliotekanauki.pl/articles/16538468.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
Antarctic
SII reaction center
DNA damage
photochemical and non-photochemical quenching
Opis:
Ozone depletion at southern latitudes has recently increased the fluence of ultraviolet-B (UV-B) radiation striking the ground. This phenomenon has sparked much interest in unravelling the effects of this harmful radiation on living systems. UV-B radiation triggers several responses that affect plant physiology, morphology and biochemistry. In this study, the effect of supplemental UV-B radiation on DNA profile and chlorophyll a (CHl a) fluorescence characteristics were analyzed. An increase in the genetic variability of irradiated plants was observed in the Inter Sequence Simple Repeats products. The effect on photosynthesis was studied through fluorescence emissions. The obtained data showed that photochemical quenching (qP) decreased in irradiated plants. This effect may be attributed to a decrease in the number of open reaction centers of photosystem II (PSII) as suggested by the decreased values of minimal and maximal fluorescence. Likewise, non-photochemical quenching (NPQ) increased in both control and irradiated groups, but treated plants presented lower NPQ values than controls. The heat dissipation mechanism was also altered, probably due to a decrease i in the yield of the maximal fluorescence in light-adapted leaves (Fm´). According to these findings, UV-B radiation affects the CHl a fluorescence mechanisms and modifies DNA profile. Consequently, these changes influence the yield and growth of plants, which is an important consideration given the current climate change situation.
Źródło:
Polish Polar Research; 2022, 43, 4; 325-339
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Genetic variability of sotol (Dasyrylion cedrosanum) populations in the Mexican Coahuila southern area
Autorzy:
Rentería, Norma Paola Meléndez
Padilla, Veronica
Lozano, Gerardo Gaona
Aguilar, Cristobal Noe
Rodríguez-Herrera, Raúl
Powiązania:
https://bibliotekanauki.pl/articles/2199675.pdf
Data publikacji:
2012-08-20
Wydawca:
Instytut Hodowli i Aklimatyzacji Roślin
Tematy:
AFLP
Genetic Diversity
Sotol
Dasylirion cedrosanum
Opis:
In the Chihuahuan desert area, in Mexico, exist an endemic plant denominated Sotol (Dasylirion spp); which is used by rural producers to manufacture a liqueur named Sotol. This beverage has origin denomination but it industrial application has lack scientific reports,  as well as the plant genetic information. This is the first study about ecological distribution of sotol plants and, may be, a first step to continue the scientific investigation of a Mexican endemic plant, with many potential industrial applications. In this paper, we used AFLP molecular markers to calculate population genetics parameters  as genetic diversity, a conglomerate analyses, poblational structure based in Wright´s statistics and analysis of molecular variance. Differences in soil composition and weather conditions, of the sampling region, may affect sotol plants growth and their morphologic characteristics; as consequence the organisms generate ample genetic variability, which ensures the species permanence. Genetic diversity values were similar to the average for cross-pollinated plants, while the heterozygosis detection was deficient; Wright statistics suggest plants genetics interchange in the subpopulation; AMOVA found significant differences within and between collections. These results help us to maintenance the genetic diversity, in order to prevent potential extinction and guarantee sustainable development; the preservation of the endemic plants is necessary to the ecosystems conservation and after Sotol origin denomina- tion, by the Mexican government, the importance of D. cedrosanum plants was increased.
Źródło:
Plant Breeding and Seed Science; 2012, 66; 75-88
1429-3862
2083-599X
Pojawia się w:
Plant Breeding and Seed Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Genetic Diversity of Mexican Oregano Lippia berlandieri Schauer, from the Chihuahuan Desert Area.
Autorzy:
Rentería, Norma Paola Meléndez
Silva-Vázquez, Ramón
Morrillón, Guadalupe Virginia Nevárez
Aguilar, Cristóbal Noé
Herrera, Raúl Rodríguez
Powiązania:
https://bibliotekanauki.pl/articles/2199946.pdf
Data publikacji:
2010-12-01
Wydawca:
Instytut Hodowli i Aklimatyzacji Roślin
Tematy:
ALP
Genetic Diversity
Lippia berlandieri Schauer
Mexican oregano
Wright's statistics
Opis:
The Mexican oregano Lippia berlandieri Schauer is widespread in Mexico. Several studies have involved the characterization of its essential oil in order to use it as food additive and for medical aims, as well as its antimicrobial and antioxidant capacity, although there is a lack of information about genetic diversity of this species. In order to increase Lippia berlandieri Schauer application, knowledge of the genetic characteristics of the species and creation of a program for germplasm conservation seem to be essential. This study was carrying out in order to understand the population genetics of Lippia berlandieri Schauer. Oregano seeds were collected from 8 locations of the Chihuahua Southeastern desert area. The results showed high genetic variability among oregano populations suggesting that this species is mainly allogamous, pollinated mainly by insects because of the attractive flower color; AMOVA showed genetic differences within and among populations, the last one was found approximately 5 times higher than the genetic differences within populations. The analysis of the Wright´s statistics, especifically FIS, supported the hypothesis that plants are not self-pollinating. On the other hand, it was found that the number of plants per a sample recommended for further genetic analysis of this specie is 13 or more...
Źródło:
Plant Breeding and Seed Science; 2010, 62; 85-96
1429-3862
2083-599X
Pojawia się w:
Plant Breeding and Seed Science
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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