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(Last modification: 22. October 2010)

 

Resveratrol Synthesis in Transgenic Plants and other Organisms

 

Setup of page

Note: the References plus Abstracts are in a separate page: click here for direct access.

Link to  some interesting reviews (new 22.10.2010)

 


 

Transgenic Plants

 

   If you are really keen on resveratrol, but shy away from taking it in pill form: at least theoretically, you could get it with your daily food. A large number of plants have been genetically engineered to synthesize resveratrol: by introduction and expression of a resveratrol synthase gene. I am not sure, however, whether any of these plants is already used in agriculture. It certainly is difficult to be imagined in Germany, with its wide-spread animosity against transgenic plants.

   Looking at the publications, it becomes obvious that supplementation of foods with resveratrol was originally not the primary purpose: the early work was not aware of that aspect; it rather investigated whether transgenic stilbenes in their role as phytoalexins would increase resistance against fungal and/or bacterial infections.

   A good recent review, however a bit too much focussed on grapevine and its STS: Delaunois et al. (2009).

 

Plant
(with links to Wikipedia)

References and short comments
 

Arabidopsis thaliana

 

Yu et al., 2006;
-> why Arabidopsis? The only justification seems to be that this tested the first STS from a monocot: Sorghum bicolor.

Alfalfa (Medicago sativa)

 

Hipskind et al., 2000;
-> intended as phytoalexin: but resveratrol should have the same beneficial effects in cattle as in humans?

Apple (Malus domestica)
 

Szankowski et al., 2003; Rühmann et al., 2006;
-> for apples as sources of resveratrol

Grape (Vitis vinifera)
 

Fan et al., 2008; Coutos-Thévenot et al., 2001;
-> for disease resistance (role as phytoalexin)

Hop (Humulus lupulus)





 

Schwekendiek et al., 2007;
-> According to the authors, "sts transgenic hop plants could display enhanced pathogen resistance against microbial pathogens, exhibit new beneficial properties for health, and open new venues for metabolic engineering": how about bringing via these plants resveratrol into beer?
-> Actually, hop cones appear to contain resveratrol (most in the form of piceid, the sucrose derivative) anyway: Callemien et al., 2005; Jerkovic et al., 2005; Jerkovic and Collin, 2007; Jerkovic and Collin, 2008.

Kiwi (Actinidia deliciosa)
 

Kobayashi et al., 2000;
-> apparently no effect on disease resistance, but the resveratrol in the fruits might have beneficial effects on humans

Lettuce (Lactuca sativa)
 

Liu et al., 2006;
-> food supplementation with resveratrol !

Monocots


   - Barley (Hordeum vulgare)
   - Rice (Oryza sativa)
   - Wheat (Triticum spp.)
 

-> apparently for phytoalexin formation: are there recent attempts to get resveratrol into the seeds?

Leckband and Lörz, 1998; 

Stark-Lorenzen et al., 1997; Tian et al., 1998
Leckband and Lörz, 1998; Fettig and Hess, 1999;Liang et al., 2000Serazetdinova et al., 2005;
 

Papaya (Carica papaya)
 

Zhu et al., 2004;
-> disease resistance

Peas (Pisum sativum)
 

Richter et al., 2006;

-> disease resistance

Rapeseed (Brassica napus L.)
 

Hüsken et al., 2005;
-> supplementation of the seeds with resveratrol !

Strawberry (Fragraria)
 

Hanhineva et al., 2009
-> no stilbenes detected, although changes in metabolite profile

Monterey Pine = Radiata pine (Pinus radiata)
 

Höfig et al., 2006;
-> interesting approach to genetically engineered nuclear male sterility!
 

Rehmannia glutinosa

 

Lim et al., 2005;
-> this medicinal plant contains traces of resveratrol type compounds: the STS from peanut was used to increase resveratrol amounts

Tobacco

 

Hain et al., 19901993; Fischer et al., 1997; Zhong et al., 2004; Schmidlin et al., 2008;
-> pathogen resistance (who would eat tobacco?
However, there are also tobacco chewers).
-> Fischer et al.: Effect of resveratrol on male sterility!

Tomato (Lycopersicon esculentum)



 

Thomzik et al., 1997; Giovinazzo et al., 2005; Morelli et al., 2006; Schijlen et al., 2006; Nicoletti et al., 2007; D'Introno et al., 2009; Ma et al., 2009;
->These seem to be the most advanced experiments to genetically engineer resveratrol biosynthesis specifically into fruits!

-> Interestingly, one publication even claimed that resveratrol glucoside (piceid) is present in normal tomato, but only in the skin of the fruit, not in the flesh (
Ragab et al., 2006)
,

White poplar (Populus alba)
and
Aspen (Populus tremula)
 

Giorcelli et al., 2004;
-> much resveratrol-glycoside, but no increased resistance against rust disease
Seppänen et al., 2004;
-> resistance against fungi

 

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Other Organisms

 

Human cell cultures


 

Zhang et al., 2006
-> recent work shows that the pathway from the amino acids phenylalanine/tyrosine to resveratrol can be transferred by genetic manipulation to human cell cultures. No precursor feeding was necessary to obtain resveratrol in the cells !!!

Yeast (e.g. Saccharomyces cerevisiae)



 

Gonzalez-Candelas et al., 2000; Becker et al., 2003, Beekwilder et al., 2006, Zhang et al., 2006; Trantas et al., 2009;
->The expression of the pathway from phenylalanine to resveratrol also works with yeasts:
The interesting aspect in this is that using such strains in beer or wine fermentation could introduce resveratrol into beer and white wine !!!

Streptomyces venezuelae
 
Park et al., 2009
-> The first publication with expression in Streptomycetes

E. coli



 

Watts et al., 2006; Beekwilder et al., 2006; Katsuyama et al., 2007a; Katsuyama et al., 2007b; Horinouchi 2009
-> And how about E. coli? These bacteria were not only used to get recombinant chalcone and stilbene synthases (for functional investigations in vitro), but they can also be engineered to produce stilbenes in vivo:
Would it not be a hilarious idea to have such a supplement in your intestinal flora?

 

Link to some reviews

 

Return to Resveratrol

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A few comments

 

  • "Functional food"
       While looking up the literature on transgenic plants synthesizing resveratrol, one cannot avoid this term that seems a bit confusing at first. Usually, there is an opposite term for a given property, like functional versus non-functional machinery. What might be the opposite of functional food? Non-functional food? And what might that mean?  I always thought that food is by definition functional, as nourishment.
    Wikipedia provides some definition:
    -
    Functional food or medicinal food is any fresh or processed food claimed to have a health-promoting or disease-preventing property beyond the basic function of supplying nutrients. The general category of functional foods includes processed food or foods fortified with health-promoting additives, like "vitamin-enriched" products. Fermented foods with live cultures are considered as functional foods with probiotic benefits
    ".
    - Transgenic plants with resveratrol would certainly be considered as "functional food", but would they qualify as "organic" food?

  • "Organic Food" (deutsch: "Bio-Lebensmittel")
       Rather similar problems come up with this term: what is the opposite? The meaning obviously has nothing to do with the standard meaning of 'organic' in science. According to Wikipedia,  "organic certification" is a rather complex topic. One point, however, seems to be clear:
    -  "In most countries, organic produce may not be genetically modified".
    -  Therefore, forget about "functional food" with healthy resveratrol introduced by addition of genes: it will never qualify as "organic food".
    - However, there may be ways to bypass this in some cases. Examples (there may be more that I am not aware of at present):
       - Sorghum bicolor does contain a stilbene synthase gene (SbSTS1) which is most likely involved in pathogen resistance (Yu et al., 2005), and the function in resveratrol biosynthesis was demonstrated by transgenic expression in A. thaliana (see Table above).  Why should it not be possible, with the sophisticated methods of modern plant breeding, to obtain gene expression in the seeds? That would be "functional" without genetic modification , i.e. it would be "organic".
       - Bananas (Musa cavendish) contain resveratrol dimers (Hölscher et al., 1996). Apparently so far they were only found in rhizomes, but would it be possible by classical plant breeding techniques to obtain gene expression in fruits? Again, as above: That would be "functional" without genetic modification , i.e. it would be "organic".

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