boron has been researched along with caffeic-acid* in 2 studies
2 other study(ies) available for boron and caffeic-acid
| Article | Year |
|---|---|
Role of phenolics and boron in reproductive success in seasonally transient sterile Tecoma stans L.
Quantitative and qualitative analysis of phenolics and boron in stigma of transient sterile Tecoma stans L. during seedless (May-July), partially seedbearing (August-November, April) and seedbearing periods (December-March) was made. UV absorption profile of stigmatic exudates indicated the presence of simple phenolics. Total phenolics were higher in stigma during seedless period. Thin layer chromatographic analysis of stigmatic extracts exhibited only three principal spots. Mass spectrophotometry showed the presence of derivatives of cinnamic acid, namely, caffeic acid in these spots. Quantity of boron in stigma during seedless period was lowest but the difference with other periods was not significant. It was suggested that the accumulation of higher quantity of caffeic acid in the stigma during seedless period due to high temperature (40 degrees-45 degrees C) could lead to inhibition of pollen germination in vivo, thereby rendering the plants seedless. This was confirmed by inhibition of in vitro pollen germination in the basal medium containing higher quantity of caffeic acid. Topics: Bignoniaceae; Boron; Caffeic Acids; Chromatography, Thin Layer; Cinnamates; Fertility; Flowers; Germination; Mass Spectrometry; Phenols; Pollen; Seasons; Seeds; Temperature | 2004 |
Boron deficiency causes accumulation of chlorogenic acid and caffeoyl polyamine conjugates in tobacco leaves.
The effects of boron (B) deficiency on carbohydrate concentrations and the pattern of phenolic compounds were studied in leaves of tobacco plants (Nicotiana tabacum L.). Plants grown under B deficiency showed a notable increase in leaf carbohydrates and total phenolic compounds when compared to controls. The qualitative composition of phenolics was analyzed by HPLC-mass spectrometry. The level of caffeate conjugates (i.e., chlorogenic acid) increased in B-deficient plants. In addition, the accumulation of two caffeic acid amides (N-caffeoylputrescine and putative dicaffeoylspermidine) was observed. Topics: Boron; Caffeic Acids; Carbohydrate Metabolism; Chlorogenic Acid; Fructose; Glucose; Nicotiana; Plant Leaves; Polyamines; Putrescine; Spermidine; Starch | 2004 |