%0 Journal Article
%T Drought and leaf damage limit the search for support in the climbing plant Ipomoea purpurea (L.) Roth (Convolvulaceae) La sequ赤a y el da o foliar limitan la b迆squeda de soporte en la planta trepadora Ipomoea purpurea (L.) Roth (Convolvulaceae)
%A CRISTIAN ATALA
%A CRISTIAN CORDERO
%A ERNESTO GIANOLI
%J Gayana. Botanica
%D 2011
%I Universidad de Concepci車n
%X There is evidence that some climbing plants increase their twining rate after leaf damage, thus avoiding ground herbivores, and that drought limits this induced response. However, it is unknown whether leaf damage and drought affect the search for support, an ecologically relevant process for climbing plants. We evaluated the combined effect of drought and leaf damage on support searching in the twining vine Ipomoeapupurea (Convolvulaceae). Plants were assigned to a combination of three watering treatments (regular watering, moderate drought, and severe drought) and two damage treatments (control and 50% defoliation). We placed a stake at 15 cm from the stem and recorded the time to successful twining (360∼ turn). We also measured some plant functional traits to explore possible mechanisms. Leaf damage decreased time to successful twining in all treatments with the exception of severe drought. Severe drought decreased plant growth, particularly when combined with leaf damage. In nature, climbing plants are usually not in contact with a support in the early stages. The searching behavior seems to increase with leaf damage, but it is restricted by water shortage. Plants experiencing both leaf damage and severe drought will be less likely to find a support, resulting in higher probability of further leaf damage. Hay evidencia de que las plantas trepadoras aumentan su tasa de enredo luego del da o foliar, evitando as赤 a los herb赤voros, y que la sequ赤a limita esta respuesta. Sin embargo, se desconoce si la combinaci車n del da o foliar y la sequ赤a afectan a la b迆squeda de soporte, un proceso ecol車gicamente relevante para las plantas trepadoras. En este trabajo evaluamos el efecto combinado de la sequ赤a y el da o foliar en b迆squeda de soporte en la enredadera Ipomoea pupurea (Convolvulaceae). Las plantas se asignaron a una combinaci車n de tres niveles de riego (riego normal, sequ赤a moderada y sequ赤a intensa) y dos niveles de da o (control y 50% de defoliaci車n). Se coloc車 un soporte a 15 cm del tallo y se registr車 el tiempo de enredo efectivo (giro de 360∼ alrededor del soporte). Tambi谷n se midieron algunos rasgos funcionales para explorar posibles mecanismos. El da o foliar disminuy車 el tiempo de enredo efectivo en todos los tratamientos con excepci車n del de sequ赤a intensa. La sequ赤a intensa disminuy車 el crecimiento de las plantas, particularmente al combinarla con da o foliar. En la naturaleza, las plantas trepadoras usualmente no est芍n en contacto con un soporte en sus etapas iniciales. La conducta de b迆squeda de soporte parece aumentar con el da o foliar, per
%K B迆squeda de soporte
%K sequ赤a
%K da o foliar
%K Ipomoea purpurea
%K Support searching
%K drought
%K leaf damage
%K Ipomoea purpurea
%U http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000200011