Phenolic constituents in the leaves of northern willows: methods for the analysis of certain phenolics
- R. Julkunen‐Tiitto
- 1 March 1985
Bioactive polyphenols in leaves, stems, and berries of Saskatoon (Amelanchier alnifolia Nutt.) cultivars.
- A. Lavola, R. Karjalainen, R. Julkunen‐Tiitto
- Chemistry, MedicineJournal of Agricultural and Food Chemistry
- 23 January 2012
The findings reveal that leaves and stems of Saskatoon cultivars possess high amounts of various phenolic compounds that may offer new functional raw materials for a wide range of food and health products.
Effects of elevated CO2 and temperature on plant growth and herbivore defensive chemistry
- T. Veteli, K. Kuokkanen, R. Julkunen‐Tiitto, H. Roininen, J. Tahvanainen
- Environmental Science
- 1 December 2002
Climate change may significantly modify the dynamic interaction between willow and beetle populations and thus affect herbivores living on this species.
Manipulation of the phenolic chemistry of willows by gall-inducing sawflies.
Analysis of the concentrations of various plant defense compounds in willow leaves and sawfly galls found that the galls are probably nutritionally beneficial for the sawfly larvae, and changes in chemistry occur in a similar coordinated pattern in all studied willow species, which suggests that the insects control the phenolic biosynthesis in their hosts.
Phenolic glycosides govern the food selection pattern of willow feeding leaf beetles
Very rare glycosides or exceptional combination of several glycoside types seem to provide certain willow species with high level of resistance against most herbivorous insects.
Long-term experimental warming, shading and nutrient addition affect the concentration of phenolic compounds in arctic-alpine deciduous and evergreen dwarf shrubs
- Anja Hansen, S. Jonasson, A. Michelsen, R. Julkunen‐Tiitto
- Environmental ScienceOecologia
- 1 February 2006
The results indicate that there is no common response to environmental changes across species and substances, but the pronounced treatment responses imply that the quality of the herbivore forage is likely to be strongly affected in a changing arctic environment, although both the direction and strength of the responses will be different among plant species, tissue types and substances.
Red : far-red light ratio and UV-B radiation: their effects on leaf phenolics and growth of silver birch seedlings
Results of these experiments show that exposure of silver birch seedlings to supplemental FR compared to R leads to fast elongation growth and accumulation of phenolic acids in the leaves.
HERBIVORE RESISTANCE IN BETULA PENDULA: EFFECT OF FERTILIZATION, DEFOLIATION, AND PLANT GENOTYPE
There are significant differences among the clones in their insect and mammalian resistance, which indicates that resistance can evolve as a response to herbivory, and the correlations of secondary chemistry and E. autumnata performance indices suggest that the constitutive level of resistance of B. pendula is higher than expected.
Solar UV-B radiation affects leaf quality and insect herbivory in the southern beech tree Nothofagus antarctica
- M. Rousseaux, R. Julkunen‐Tiitto, P. Searles, A. Scopel, P. Aphalo, C. Ballaré
- Environmental ScienceOecologia
- 22 January 2004
Correlation analyses suggested that the reduction in insect herbivory in the field under solar UV-B may be mediated in part by theUV-B effects on gallic acid and flavonoid aglycone.
Accumulation of phenolic compounds in birch leaves is changed by elevated carbon dioxide and ozone
Atmospheric change may affect plant phenolic compounds, which play an important part in plant survival. Therefore, we studied the impacts of CO2 and O3 on the accumulation of 27 phenolic compounds in…