| Description: |
Total phenolic glycosides, fragilin, Picein, salicortin, tremulacin, and tremuloidin all correlated positively with shoot length in glasshouse plants on a carbon-biased balance, and male willows had generally lower levels of phenolic glycosides than females. |
| In vitro: |
| Journal of Chemical Ecology, 01 Apr 1989, 15(4):1117-1131. | | Carbon-nutrient balance hypothesis in within-species phytochemical variation ofSalix lasiolepis.[Reference: WebLink] | Predictions of the carbon-nutrient balance hypothesis were tested using a study of within-species phytochemical variation in the arroyo willow,Salix lasiolepis.
METHODS AND RESULTS:
The prediction that a balance between nutrients (total protein) and carbon-based secondary metabolites (total phenols) should exist was supported using water treatment and fertilizer experiments and wild willow clones. Leaf nitrogen content and net photosynthetic rates of plants potted in soil in which parental plants grew was low, indicating that wild plants exist under relatively low nutrient status-high carbon balance conditions. The hypothesis also correctly predicted positive relationships between shoot length and phenols in glasshouse plants, wild plants, and plants in the water treatment experiment and negative relationships between shoot length and phenols in the fertilizer treatment experiment.
CONCLUSIONS:
Total phenolic glycosides, fragilin, picein, salicortin, tremulacin, and tremuloidin all correlated positively with shoot length in glasshouse plants on a carbon-biased balance, and male willows had generally lower levels of phenolic glycosides than females. Salicortin and tremulacin showed the strongest positive relationships with shoot length. | | Forest Pathology,2007,19(5‐6):323-334. | | p‐Hydroxyacetophenone and Picein contents of healthy and damaged spruce needles from different locations in Bavaria.[Reference: WebLink] |
METHODS AND RESULTS:
Picein can quickly be converted into p‐hydroxacetophenone by endogenous glucosidases activated by freezing and thawing of spruce needles. Picein was the main component of all investigated spruce needles. Its contents varied between 4 and 30 mg/g fw whereas p‐hydroxyacetophenone (pHAP) concentrations between 0.2 and 0.6 mg/g fw were found. No significant difference for picein and pHAP contents were observed comparing green and bleached needles or needle segments.
CONCLUSIONS:
In each case the ratio of pHAP to picein was smaller than one for both green and bleached needles. The importance of pHAP for pigment bleaching is discussed. |
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