Programa Institucional de Maestría en Ciencias Biológicas

CUERPO ACADÉMICO ECOFISIOLOGÍA VEGETAL INVITA A LA CONFERENCIA Plant hydraulic mechanisms underlie greater productivity under drought in grain crops RESUMEN... Although there has been great interest in plant mechanisms related to crop production under drought, hydraulic mechanisms have rarely been explored. In maize, we find genotypes with the highest yield under drought in the field have the highest maximum hydraulic conductance, and highest maximum diurnal stomatal conductance. These genotypes have large diameter xylem vessels to facilitate this conductance. Interestingly, maize can lose > 50% of its conductive capacity each day, resulting from xylem embolization, even under well-watered conditions. However, high yielding genotypes under drought also have greater root flow via root pressure following re-watering. Immediately after stems are cut, there is no root flow from dry plants but after plants are re-watered and given an hour for recovery, there is substantial flow. Measured root pressures in maize can exceed 100 kPa, which would allow the lifting of water to a height of approximately 10 m in a non-transpiring plant. With extremely low nighttime transpiration and plant heights of approximately 2 m in maize, root pressures measured should effectively pressurize the entire vascular system of the plants and dissolve emboli. In sorghum, maximum root flow after re-watering was also higher in droughted plants than well-watered plants, suggesting an actively- regulated mechanism. We suggest hydraulic mechanisms may be key for maintaining growth of developing grain through reversing stem xylem cavitation, refilling potentially collapsed leaf xylem, and allowing for the resumption of carbon fixation. Key words: Root pressure; Root flow; Xylem cavitation; Embolism repair; Hydraulic recovery; WUE. Informes: Dra. Jeannette S. Bayuelo Jiménez; [email protected] (443) 3223500 Ext. 5231

Último Examen Nacional de Ingreso al Posgrado EXANI-III, 2020. https://www.ceneval.edu.mx/exani-iii

Programa Institucional de Maestría en Ciencias Biológicas

LISTADO PRIORIZADO DE ASPIRANTES DE INGRESO EN LA CONVOCATORIA PIMCB-2019 https://www.pimcb.umich.mx/#aspirantes

Fechas Administrativas Importantes para el PIMCB * Exámenes tutorales: del 06 al 31 de enero de 2020. * Captura de calificaciones en el SIIA: del 20 de enero al 14 de febrero de 2020. * Fin de ciclo escolar: 16 de febrero del 2020.... * Fecha de entrega del informe CONACYT: Lunes 17 de febrero de 2020 (Documentos originales y digitalizados). Fecha para el formato del informe: 02 de septiembre 2019 28 de febrero 2020. Circular-->https://www.pimcb.umich.mx//CIRCULAR_CAT_MAESTRIA_DIC2019.

El Programa Institucional de Maestría en Ciencias Biológicas de la Universidad Michoacana de San Nicolás de Hidalgo, comparte una actualización de su convocatoria de ingreso 2022-1 Les recordamos que la convocatoria está abierta hasta el 14 de enero del 2022.