No abstract

El procesamiento digital de imágenes es una herramienta que facilita el análisis morfológico. Por lo que, se planteó evaluar las características morfológicas de plantas de sotol usando imágenes digitales. Para esto, se tomaron las variables: altura de la planta, diámetro de cobertura, altura y diámetro del tallo de 10 plantas en cuatro localidades de Coahuila. Además, de fotografías a cada espécimen y se analizaron los datos morfológicos en el programa ImageJ. Utilizando un análisis de regresión lineal y de correlación se realizó una comparación entre los datos medidos de forma manual y digital. Los resultados muestran que las variables determinadas de forma manual tienen correlación positiva y significativa con las variables de las fotografías analizadas digitalmente. El uso de fotografías y del análisis digital es una herramienta de apoyo para caracterizar la morfología y seleccionar las plantas de sotol.

No abstract

Prunus cercocarpifolia Villarreal (Rosaceae) is an endemic shrub species restricted to the Sierra Zapalinamé in southeastern Coahuila, Mexico. It is a refuge and food source for native fauna, but their populations have been affected by human activities. In this study, we evaluated 11 pregerminative treatments in seeds of this species. These treatments consisted of the imbibition in water and stratification at different times and temperatures. The treated seeds were sown, and we assessed the percentage of germinated, dark, and non-germinated seeds, as well as the pro- portion of normal and abnormal seedlings. The seed imbibition with endocarp for 48 h at 30°C reached the highest germination percentage (89%), with all seeds being germinated, and 58% of normal seedlings produced. With the stratification for 8 days at 5°C, all seeds were germinated and a 64% of normal seedlings was achieved. Implementing these treatments on nursery production can contribute to the conservation of this endemic species of northeastern Mexico

The objective of the research was to evaluate the effect of relative humidity (RH) and moisture content (MC) on the incidence of pathogenic fungi on the seeds of Agave lechuguilla, Lippia graveolens, and Nolina cespitifera. Seeds were stored 90 days at 60, 75, 80, and 85% RH, and results were processed with a correlation analysis in the R software using the Spearman test. Higher fungi incidence (FI) in seeds was found from 10 to 20% RH; however, correlation between RH and MC of seeds was positive with r = 0.311 and p = 2.2 × 10 − 16 . In general, RH is related to MC, but not to fungi incidence, which is related mainly to MC of seeds. Correlation between RH and FI for each seed species was not significant, r = 0.026, −0.040, and 0.071 and p = 0.687 , 0.540, and 0.272 for A. lechuguilla, N. cespitifera, and L. graveolens, respectively. There was a positive correlation between the MC of seeds with fungi incidence; a negative correlation between the RH and the FI; and a positive correlation between the RH and the MC of seeds. In this type of seeds (orthodox), the MC is probably the most important factor in determining its longevity. The seeds under study can be stored in a 60% to 75% RH. Five fungi genera were found, predominating Aspergillus with five identified species.