Photosynthetic responses of field-grown Pinus radiata trees to artificial and aphid-induced defoliation
Alieta Eyles, David Smith, Elizabeth A Pinkard, Ian Smith, Ross Corkrey, Stephen Elms, Chris Beadle, Caroline Mohammed
TREE PHYSIOLOGY | OXFORD UNIV PRESS | Published : 2011
The phloem-feeding aphid Essigella californica represents a potential threat to the productivity of Pinus radiata plantations in south-eastern Australia. Five- and nine-year-old field trials were used to characterize the effects of artificial and natural aphid-induced (E. californica) defoliation, respectively, on shoot photosynthesis and growth. Photosynthetic capacity (A(max)) was significantly greater following a 25% (D25) (13.8 µmol m(-2) s(-1)) and a 50% (D50) (15.9 µmol m(-2) s(-1)) single-event upper-crown artificial defoliation, 3 weeks after defoliation than in undefoliated control trees (12.9 µmol m(-2) s(-1)). This response was consistently observed for up to 11 weeks after the de..View full abstract
Awarded by Cooperative Research Centre for Forestry
We acknowledge the Cooperative Research Centre for Forestry (sub-project 1.2.2) for financial support.