Influencia de la luz y la temperatura en la germinacion de esporangios y en la esporulacion de peronospora sparsa berkeley, en rosa cultivar charlotte

Abstract

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QFormat="true" Name="TOC Heading" /> </w:LatentStyles> </xml><![endif]--><!--[if gte mso 10]> <style> /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabla normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin-top:0cm; mso-para-margin-right:0cm; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0cm; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin;} </style> <![endif]--> <p class="MsoNormal" style="margin-bottom: 0.0001pt; text-align: justify; line-height: normal;"><span style="font-size: 12pt; font-family: ";Times New Roman";,";serif";;" lang="ES-CO">Se evaluó la influencia de la luz y la temperatura en la germinación de esporangios en agar agua, y en la esporulación en foliolos de rosa con mildeo velloso <em>Peronospora sparsa </em>Berkeley. Los mayores porcentajes de germinación, 83, 87 Y 87 %, se obtuvieron después de 4, 6 Y 8 horas de incubación, bajo condiciones de oscuridad y 15 °C. En las primeras horas de incubación, el efecto de la luz en la germinación de los esporangios fue diferencial dependiendo de la temperatura. Después de 12 horas de incubación a 15 °C, la tasa germinativa se incrementa a 93% y la iluminación no afecta dicha tasa. Incubación de los esporangios a 20 °C resultó en una germinación menor que a los 15 °C. El efecto en la esporulación se evaluó en foliolos cortados infectados. Los foliolos inoculados se incubaron en cámaras de crecimiento a 15 y 20 °C con distintas condiciones de luz. La esporulación en oscuridad fue menor a la esporulación bajo luz continua o bajo fotoperiodo. La esporulación a 15 °C fue más baja que a 20 °C. La incubación con fotoperiodo y a 20 °C produjo la esporulación más alta.</span></p> <p class="MsoNormal" style="margin-bottom: 0.0001pt; text-align: justify; line-height: normal;"><span style="font-size: 10pt; font-family: ";Times New Roman";,";serif";;" lang="ES-CO"> </span></p> <p class="MsoNormal" style="margin-bottom: 0.0001pt; text-align: justify; line-height: normal;"><strong><span style="font-size: 10pt; font-family: ";Times New Roman";,";serif";;" lang="ES-CO">Palabras clave:</span></strong><span style="font-size: 10pt; font-family: ";Times New Roman";,";serif";;" lang="ES-CO">Peronosporales, mildeo velloso, ciclo de patogénesis.</span></p>