The effects were examined of plantresponse signaling compounds, salicylic acid (SA) and methyl jasmonate (MeJA), on resistance to pill-bugs (Armadillidium vulgare) attack in lettuce plants. Foliar SA and MeJA applications were made at weekly intervals from the emergence of the plant until one week before harvesting. SA and MeJA induced detectable levels of hydrogen peroxide (H 2 O 2 ) at least during 5 days post-application in these plants throughout their cultivation. On the whole, SA and MeJA in the concentrations and application scheme evaluated in this research did not significantly influence the dry and fresh weight matter of plants, or the chlorophyll and nitrate contents. In addition, both signal elicitors significantly diminished lettuce mortality due to pill-bugs, which was positively correlated with phenolics and flavonoids contents. Our results suggest that SA and MeJA, especially in low concentrations, should be further evaluated in lettuce production and priming resistance.
Resumen: Se analizó la riqueza fl orística, el hábito y la forma de vida, la presencia de especies nativas e introducidas, la fl ora sinantrópica, los patrones de distribución y endemismo, el estado de conservación de las plantas vasculares y se caracterizó los tipos de vegetación presentes en la Sierra El Rincón, Querétaro y Michoacán, México. Se registraron 79 familias, 216 géneros, 333 especies y 23 taxa infraespecífi cos. Las familias con la mayor riqueza fl orística fueron Asteraceae (67), Poaceae (28) y Fabaceae (13). En cuanto a los géneros destacaron Quercus y Stevia. El hábito herbáceo está presente en el 84.1 % de las especies y las formas de vida predominantes fueron las hemicriptófi tas (45.1 %) y terófi tas (12.9 %). El 96 % de la fl ora es nativa a México y el 36.6 % son indicadoras de disturbio. Se registraron siete patrones de distribución geográfi ca, donde se destaca que el 35.4 % (118) de la fl ora es endémica de México. Así como dos patrones de endemismo, en los cuales 29 especies (8.7 %) limitan su distribución al centro del país y 89 (26.7 %) presentan una amplia distribución en el territorio nacional. De acuerdo con la NOM-059-SEMARNAT-2010 son Especies Sujetas a Protección Especial a Gentiana spathacea y Mammillaria rhodantha subsp. pringlei, y como Amenazada se encuentra Dasylirion acrotrichum. Se reconocieron siete tipos de vegetación, de los cuales el bosque de Quercus y de QuercusPinus son los tipos dominantes en el área de estudio. Además de contribuir signifi cativamente a la riqueza fl orística de la región, esta sierra brinda diversos servicios ambientales a la población como la recarga de acuíferos, fl ora útil y áreas de esparcimiento. Es necesario coordinar esfuerzos y desarrollar un plan de manejo integral dirigido a la conservación y al uso sustentable de la fl ora y vegetación de la Sierra El Rincón. Palabras Clave: Amealco, bosque de encino-pino, Epitacio Huerta, Flora del Bajío, Huimilpan. Abstract:In this work the taxonomic richness, habit and life form, presence of native and introduced species, sinantropic fl ora, distribution and endemism patterns, and species conservation status were analyzed, and the type of vegetation was characterized in Sierra El Rincón, Querétaro and Michoacán states, Mexico. Seventy nine families, 216 genera, 333 species, and 23 infraspecifi c taxa were recorded. Asteraceae (67), Poaceae (28) and Fabaceae (13) were the richest families. For genera, Quercus and Stevia were the richest. The herbaceous habit is present in 84.1 % of species and the main life forms were hemicryptophytes (45.1 %) and therophytes (12.9 %). From total fl ora, 96 % are native to Mexico and 36.6 % are disturbance indicators. Seven geographic distribution patterns were recorded, from total fl ora, 35.4 % (118) is endemic to Mexico. Two endemism patterns were recorded, in which 29 species (8.7 %) have their distribution limited to center of Mexico, and 89 species (26.7 %) show a wide distribution in Mexico. According to NOM-059-SEMARNAT-2010, Gentiana spathacea and Mammilla...
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