Tesis Pregrado
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Browsing Tesis Pregrado by Subject "Acidez del suelo"
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Item Efecto del pH en la morfofisiología en Chenopodium quinoa willd (Amaranthaceae).(Universidad de Concepción, 2023) Melgarejo González, Javiera Paz; Bascuñán Godoy, LuisaChanges in soil pH can alter its chemical properties, compromising the ability of plant to absorb nutrients. Chile has a latitudinal pH gradient, however, the effect of pH on plant physiological responses has been little studied Chenopodium quinoa wich has a wide distribution from north to south in Chile, with ecotypes adapted to alkaline and acidic pH soils. In this thesis we studied the effect of a pH range (2.5, 5.5 and 8.5) on the growth of C. quinoa, ecotype Socaire, that is able to grown in soils of the northern/Andean zone of the country. We evaluated parameters such as % germination and % survival, biometric parameters such as height, number of leaves, leaf and root biomass, root length and extension, and physiological parameters such as pigment level and chlorophyll a fluorescence. Our results show that % germination and survival, total, leaf and root biomass, root length and spread, and photochemical parameters tend to decrease with increasing acidity. This response is probably due to a restrictive effect on the acquisition of nutrients or intoxication by toxic mineral elements that become more bioavailable to the plants in the presence of acidity. Consistent with the place of origin of the Socaire ecotype, pH 8.5 was the most beneficial for quinoa plants. Probably Socaire with its origin in basic soils, has generated strategies to be able to acquire the necessary nutrients for its optimal development. Our findings open new questions about the mechanisms underlying the successful response of this ecotype to alkaline soil conditions.