Aims Understanding how tree species regulate multiple types of secondary chemicals along elevational gradients is critical for elucidating the physiological and ecological strategies of plants in response to varying b...Aims Understanding how tree species regulate multiple types of secondary chemicals along elevational gradients is critical for elucidating the physiological and ecological strategies of plants in response to varying biotic and/or abiotic environments.This study aims to examine how Chinese tallow tree(Triadica sebifera)allocates resources to the production of different secondary chemicals in response to varying environments across elevational gradients.Methods We conducted field surveys of different herbivore feeding guilds and their damage rates on Chinese tallow trees along an elevational gradient in China and measured secondary chemicals(tannins and flavonoids)in damaged and undamaged leaves.Important Findings The odds of a leaf being damaged(chewing or scarring)decreased with elevation.Flavonoid concentrations increased with elevation in undamaged leaves but decreased with elevation in damaged leaves,with quercitrin contributing most strongly to this pattern,likely as results of plant responding to changing biotic or abiotic stresses along elevational gradients.Tannin concentrations did not vary with elevation,so undamaged leaves had relatively lower tannin to flavonoid ratios at high elevation than at low elevation.Our study reveals variation in herbivory and contrasting trends in plant secondary metabolism along an elevation gradient and highlights the importance of simultaneously considering multiple types of secondary chemicals in plant physiological and ecological strategies.展开更多
基金supported by the National Key Research and Development Program(2017YFC1200100 to J.D.)the National Natural Science Foundation of China(31770414 to J.D.,31470447 and 31822007 to W.H.).
文摘Aims Understanding how tree species regulate multiple types of secondary chemicals along elevational gradients is critical for elucidating the physiological and ecological strategies of plants in response to varying biotic and/or abiotic environments.This study aims to examine how Chinese tallow tree(Triadica sebifera)allocates resources to the production of different secondary chemicals in response to varying environments across elevational gradients.Methods We conducted field surveys of different herbivore feeding guilds and their damage rates on Chinese tallow trees along an elevational gradient in China and measured secondary chemicals(tannins and flavonoids)in damaged and undamaged leaves.Important Findings The odds of a leaf being damaged(chewing or scarring)decreased with elevation.Flavonoid concentrations increased with elevation in undamaged leaves but decreased with elevation in damaged leaves,with quercitrin contributing most strongly to this pattern,likely as results of plant responding to changing biotic or abiotic stresses along elevational gradients.Tannin concentrations did not vary with elevation,so undamaged leaves had relatively lower tannin to flavonoid ratios at high elevation than at low elevation.Our study reveals variation in herbivory and contrasting trends in plant secondary metabolism along an elevation gradient and highlights the importance of simultaneously considering multiple types of secondary chemicals in plant physiological and ecological strategies.
