Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Titre : Ecofisiología de una línea semidomesticada de chile chiltepín (Capsicum frutescens L.) como una alternativa hortícola en zonas semiáridas

Auteur : Nieto Garibay Alejandra

Université de soutenance : Universidad de Guadalajara (UDG)

Grade : Doctorado en Ciencias Biológicas 2006

Résumé
This work was part of the strategic projects of the Arid Zone Agricultura ! Program of Centro de Investigaciones Biologicas del Noroeste (CIBNOR S.C.) in La Paz, Baja California Sur. Three main experiments were made with two hot pepper species (C. frutescens and C. annuum) under water deficit at three different stages a) germination b) emergence and e) vegetative growth and fructification. During the germination experiment water deficit treatments were established with. PEG-8000 for controlling water potential of both hot pepper species. In the emergence experiment, water deficit was established according to different irrigation days. Plants for vegetative growth and fructification were cropped in . plastic pots establishing two water deficit treatments. Recovery irrigation was applied to water deficit treatment which was made after plants showed turgor loss. The other plan ! treatment was maintained in field capacity water conditions. Results showed C. frutescens as a well adapted species to soil and weather conditions typical of the study region : water scarcity, high temperatures, and soils with low organic matter content. During germination C frutescens showed a low • germination percentage (30%) when compared with C. annuum, however, there were no negative effects of water deficit treatments in C. frutescens germination. did not show a negative effect on plants during seedling of C frutescens. The opposite was shown by C. annuum which decreased in fresh weight and biomass with deficit water treatments. During vegetative growth and fructification, C. frutescens showed a high growth of radicle and stomata closed lo water soil canten ! of 20%, but allowed transpiration process as a physiological and morphological strategy to face water stress conditions and a better umbral water optimization, all this compared with commercial pepper species. Results showed C. frutescens as a well hot · pepper adapted species lo regional weather conditions and to its semi-domestic condition which gives it a wide genetic pool and allowing a high and more diverse possibility lo respond lo stressing conditions. Under this context, it is importan ! lo study wild and semi domesticated species in arder lo maintain this genetic pool that allows its future use lo breeding agricultura ! species.

Présentation

Version intégrale (3,1 Mb)