Topic
Anchusa officinalis
About: Anchusa officinalis is a research topic. Over the lifetime, 44 publications have been published within this topic receiving 890 citations. The topic is also known as: alkanet & Anchusa officinalis.
Papers
TL;DR: In this article, it was shown that the effective visitation rate per flower was highest on plants of an intermediate size and the most efficient plant was predicted to be smaller since the proportion of fertilized flowers per bumblebee visit is expected to decrease further on the largest plants in relation to the total flower number.
Abstract: Bumblebees foraging on the self-incompatible Anchusa officinalis fly between near neighbour plants and between near neighbour inflorescences within plants. Although many-flowered plants attracted most bumblebees these plants received fewer visits on a per flower basis than smaller plants, and each bumblebee visited a smaller proportion of the flowers. The calculated effective visitation rate per flower was highest on plants of an intermediate size. If pollen-carryover was assumed to be limited the most efficient plant was predicted to be smaller since the proportion of fertilized flowers per bumblebee visit is expected to decrease further on the largest plants in relation to the total flower number. These predictions were tested by measuring fruit-set in the field. The percentage fruit-set decreased with plant size at all sizes that were investigated. That the most efficient plant was small indicates that pollen-carryover was indeed limited. However, the low percentage fruit-set associated with large size did not present a serious problem since the total estimated seed production per plant still increased with size. Selection favoring smaller plants may be low or absent in Anchusa.
97 citations
TL;DR: Observations indicate that R A biosynthesis in ANCHUSA OFFICINALIS cultures is initiated after the decline of primary metabolism.
Abstract: The kinetics of growth, rosmarinic acid (RA) accumulation, major nutrient uptake and respiration rate of ANCHUSA OFFICINALIS cell suspension cultures have been investigated. The biosynthesis of RA is restricted to the linear phase of the growth cycle, resulting in a marked increase in RA accumulation from 1% to 6% of dry weight. The onset of RA synthesis coincided with the almost complete depletion of phosphate and nitrate from the medium and also with a striking drop in respiration rate of the cultured cells. Linear phase cells also showed the highest rate of incorporation of exogeneously supplied tyrosine (>30%) and phenylalanine (>20%) into the caffeoyl ester. These observations indicate that R A biosynthesis in ANCHUSA OFFICINALIS cultures is initiated after the decline of primary metabolism.
85 citations
TL;DR: The block of the entry of tyrosine into the tyrosin-derived pathway by AOPP inhibition in vivo confirmed the role of TAT as the entrypoint enzyme of the pathway.
73 citations
TL;DR: Investigation of the influence of various macronutrients on growth and RA formation in cell suspension cultures of Anchusa officinalis showed that RA production is inhibited by 2,4-D- containing revised medium but stimulated by NAA-containing revised medium.
Abstract: The influence of various macronutrients on growth and RA formation in cell suspension cultures of Anchusa officinalis has been investigated. Factors tested included sucrose concentration, alternate carbon sources, nitrate, phosphate and calcium concentration. The optimum concentration of sucrose was 3%. Fructose, glucose or their 1:1 mixture were also suitable carbon sources. The optimum concentrations of nitrate (15 mM), phosphate (3 mM) and calcium (0.25 mM) were, respectively, 3/5, 3x, and 1/4 those in normal B5 medium, when tested separately. These concentrations improved not only the yield of RA but also cell growth to a similar degree (10%-50%). Studies on the combined effects of these optimum macronutrient concentrations in B5 medium showed that RA production is inhibited by 2,4-D-containing revised medium but stimulated by NAA-containing revised medium.
71 citations
TL;DR: By means of intra- and intermorph crosses it has been shown that the distyly in Anchusa officinalis L. is governed by a single diallelic locus with dominance, which means that at least two incompatibility loci must exist.
Abstract: By means of intra- and intermorph crosses it has been shown that the distyly in Anchusa officinalis L. is governed by a single diallelic locus with dominance. Presence of the dominant allele is reflected in the short-styled morph, while homozygous recessives become long-styled. Most of the short-styled plants are heterozygous, but homozygotes have been found among the raised progeny resulting from crossings. Diallel crosses have revealed that at least two incompatibility loci must exist. These and the morphological locus segregate independently. The type of incompatibility system is as yet unknown, though the great frequency of non-reciprocal incompatibility points to a sporophytic system.
63 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2021 | 2 |
| 2020 | 1 |
| 2018 | 2 |
| 2016 | 1 |
| 2012 | 1 |
| 2011 | 1 |