scholarly journals Differential phenolic accumulation in two Hypericum species in response to inoculation with Diploceras hypericinum and Pseudomonasputida

2014 ◽  
Vol 50 (No. 3) ◽  
pp. 119-128 ◽  
Author(s):  
C. Cirak ◽  
J. Radusiene ◽  
H.M. Aksoy ◽  
R. Mackinaite ◽  
Z. Stanius ◽  
...  
Keyword(s):  
Phenolic Compounds ◽  
Hypericum Perforatum ◽  
Plant Defence ◽  
Defence Response ◽  
Phenolic Constituents ◽  
Plant Growth Promoting ◽  
Hypericum Perforatum L ◽  
Growth Promoting ◽  
Hypericum Species ◽  
Plant Defence Response

The genus Hypericum L. (St. John’s-wort, Hypericaceae) has received scientific interest in recent years, because it is a source of a variety of bioactive compounds including the phenolics. We determine whether the typical phenolic constituents of Hypericum plants, namely chlorogenic acid, rutin, hyperoside, isoquercetine, quercitrine, and quercetine, may be implicated as part of an inducible plant defence response in two St. John’s-wortspecies, Hypericum perforatum L. and Hypericum triquetrifolium Turra. To achieve this objective, greenhouse-grown plantlets were inoculated with the fungal pathogen Diploceras hypericinum and the plant growth promoting bacterium Pseudonomas putida. Phenolic compounds levels of the Hypericum plantlets increased significantly in response to inoculation with both organisms. So far, little effort has been dedicated to investigate whether phenolic compounds are inducible by pathogen/herbivore attack or if they could play a role in plant defence. Results from the study indicate that the phenolic compounds investigated could be involved in the plant defence system and implicated as part of an inducible plant defence response in both St. John’s Wort species.

Phenolic constituents and genetic profile of Hypericum perforatum L. from India

2008 ◽  
Vol 36 (3) ◽  
pp. 201-206 ◽  
Author(s):  
Vijeshwar Verma ◽  
Andrija Smelcerovic ◽  
Sebastian Zuehlke ◽  
Mir Abid Hussain ◽  
Syed Mudasir Ahmad ◽  
...  
Keyword(s):  
Hypericum Perforatum ◽  
Genetic Profile ◽  
Phenolic Constituents ◽  
Hypericum Perforatum L

The Effects of Herbivory by a Mite, Aculus hyperici, and Nutrient Deficiency on Growth in Hypericum Species

1995 ◽  
Vol 43 (3) ◽  
pp. 305 ◽  
Author(s):  
AJ Willis ◽  
JE Ash ◽  
RH Groves
Keyword(s):  
Biological Control ◽  
Plant Growth ◽  
Hypericum Perforatum ◽  
Nutrient Deficiency ◽  
Combined Effects ◽  
Nutrient Deficiencies ◽  
Hypericum Perforatum L ◽  
Hypericum Species

The combined effects of herbivory by a mite, Aculus hyperici Liro, and a deficiency of nutrients on plant growth were measured for Hypericum perforatum L. and H. gramineum J.Forst. grown in a glasshouse. The results are discussed in relation to the biological control of H. perforatum, an introduced weed in southern Australia, relative to growth of its indigenous congener, H. gramineum. Growth of both species was reduced when infested with the mite, although the growth of H. perforatum was reduced by more than that of H. gramineum. Nutrient deficiencies also reduced growth of both species, especially of roots. Imposition of nutrient deficiency on mite-infested plants caused multiplicative reductions in plant growth equivalent to the product of the proportional reductions caused by either herbivory or nutrient deficiency alone.

Arabidopsis thaliana: a model for studies of colonization by non-pathogenic and plant-growth-promoting rhizobacteria

2001 ◽  
Vol 28 (9) ◽  
pp. 975
Author(s):  
Kenneth J. O'Callaghan ◽  
Richard A. Dixon ◽  
Edward C. Cocking
Keyword(s):  
Arabidopsis Thaliana ◽  
Plant Growth ◽  
Stress Responses ◽  
Plant Defence ◽  
Plant Growth Promoting Rhizobacteria ◽  
Molecular Data ◽  
Flavonoid Metabolism ◽  
Plant Growth Promoting ◽  
Plant Genes ◽  
Growth Promoting

This paper originates from an address at the 8th International Symposium on Nitrogen Fixation with Non-Legumes, Sydney, NSW, December 2000 Arabidopsis thaliana L. has many features favoring its use as a model in studies of plant-growth-promoting rhizobacteria (PGPR), such as diazotrophs. Several niches are colonized in the root system of Arabidopsis, including xylem, and intact colonized roots can be observed microscopically without sectioning of tissues. Studies of plant genes involved in colonization are facilitated by the ease with which plants are transformed and by the availability of mutant lines and other accessions obtainable from stock centers. Lines of Arabidopsis carrying reporter gene fusions are helping to reveal the pattern of expression of previously cloned plant genes induced by rhizobacteria. Studies utilizing indole-3-acetic acid (IAA)-producing PGPR and Arabidopsis that contain an auxin-responsive GUS fusion suggest that plants perceive IAA released by bacteria in the rhizosphere. The role of flavonoids in the colonization of non-legumes is being assessed using transgenic Arabidopsis with altered flavonoid metabolism and using tt mutants, which lack functional versions of specific genes for flavonoid metabolism. Studies of plant defence and of stress responses are producing molecular data on plant genes induced by inoculation of Arabidopsis roots with non-pathogens.

The spectral properties of Hypericum perforatum leaves: the implications for its photoactivated defences

1990 ◽  
Vol 68 (5) ◽  
pp. 1166-1170 ◽  
Author(s):  
Paul G. Fields ◽  
John T. Arnason ◽  
R. Gary Fulcher
Keyword(s):  
Visible Light ◽  
Ultraviolet Light ◽  
Spectral Properties ◽  
Hypericum Perforatum ◽  
Herbarium Specimens ◽  
Artificial Diets ◽  
Hypericum Perforatum L ◽  
Hypericum Species

Unlike most other plant-derived phototoxins that are activated by ultraviolet light, hypericin from Hypericum species causes photoactivated damage by absorbing visible light (550–610 nm, maximum at 585 nm). Clear glands from Hypericum perforatum L. transmitted 66%, veins, 6% and the mesophyll, 1% of the light at 585 nm. When the total area of the various structures was taken into account, leaves transmitted approximately 2% of the light in the photoactive range of hypericin. Other studies have shown that this intensity of light is sufficient to cause light-induced mortality in insects fed on artificial diets containing hypericin. Having a phototoxin that is activated by the same wavelengths of light that are reflected and transmitted by plants may prevent insects from avoiding phototoxicity by simply hiding under or rolling leaves. However, a survey of herbarium specimens indicated that clear glands were not an obligate component of the photoactivated defences of Hypericum species.

GSNOR-mediated de-nitrosylation in the plant defence response

Plant Science ◽  
2011 ◽  
Vol 181 (5) ◽  
pp. 540-544 ◽  
Author(s):  
Saad I. Malik ◽  
Adil Hussain ◽  
Byung-Wook Yun ◽  
Steven H. Spoel ◽  
Gary J. Loake
Keyword(s):  
Plant Defence ◽  
Defence Response ◽  
Plant Defence Response
Sign in / Sign up

Export Citation Format

Share Document