INVESTIGADORES
SOSA Alejandro JoaquÍn
artículos
Título:
Stem tissue mass density is linked to growth and resistance to a stem-boring insect in Alternanthera philoxeroides
Autor/es:
X. PAN; X. JIA; A.J. SOSA; B. LI; J. CHEN
Revista:
PLANT SPECIES BIOLOGY
Editorial:
WILEY-BLACKWELL PUBLISHING, INC
Referencias:
Año: 2011 vol. 26 p. 58 - 65
ISSN:
0913-557X
Resumen:
To investigate how stem anatomical structure is linked to growth and resistance tostem-boring insects in a herbaceous species, six populations of alligatorweed (Alternantheraphiloxeroides) were grown in a common garden. Stem growth rate (GR) of A.philoxeroides and pupation rate as an estimate of resistance to a stem-boring insect(Agasicles hygrophila) were quantified. Stem tissue mass density (TMD) was measuredand stem anatomical traits were analysed on cross-sectional areas (CSA). Stem TMD waspositively correlated with resistance (i.e. negatively correlated with pupation rate) andnegatively correlated with GR. Stem cortex CSA (%) and vascular bundle (VB) density(no./mm2) were positively related to stem TMD and negatively related to pupation rate.The GR was positively related to VB CSA (%) and negatively related to VB density. Theseresults suggest that stem TMD, which results from a high fraction in cortex CSA and highVB density, is a key determinant of resistance to a stem-boring specialist in A. philoxeroides.The high resistance of plants with higher stem TMD may partially impose a costto plant growth.
