INVESTIGADORES
LUQUEZ Virginia Martha Cristina
congresos y reuniones científicas
Título:
Natural variation of phenolic glycosides in Populus tremula and resistance to the leaf miner Phyllocnistris labyrinthella.
Autor/es:
ALBRECTSEN BR; LUQUEZ, VIRGINIA; WITZELL J; JANSSON S
Reunión:
Conferencia; Third EPSO Conference; 2006
Resumen:
Variation in plant
resistance against herbivores is often attributes to differences in secondary
chemistry. Several studies of Salicerous species have linked leaf
concentrations of phenolic glycosides to herbivore resistance. In Swedish aspen
(Populus tremula) linkage disequilibrium is very low but the level of
nucleotide poplymorphism is high and consequently Swedish aspen may be
considered as one panmictic population, which facilitates associative studies
on clone characteristics. We present natural variation of phenolic glycosides
in leaves of 48 swedish aspen clones that origin from latitudes between 55 and
66 º N. Leaf chemistry was assessed from clones that had been grown under
greenhouse conditions and the response and the response of the mining moth Phyllocnistris
labyrinthella was scored in the same clones under field
conditions in two common gardens at northern and southern latitudes
(respectively 55.9 and 63.4 N). The Expression of phenolics compounds varied
highly among the clones. Of eleven identified phenolics, catechin, cinnamic
acid and a salicortin derivative showed the strongest clinal pattern with
latitude and temperature at place of origin, indicating that aspen secondary
chemistry may be under genetic control and has adapted to local conditions. Phyllocnistris
labyrinthella. Showed opposite clinal trends in the two gardens and were
not strongly related to the average clone phenolic profile. Phenological
differences among the clones in the gardens are offered as an explanation.