Sigash vitro accomplishes that your plant breeding research and development in the field of tissue culture and biotechnology will be


to reduce time to market
to improve efficiency
to use reliable methods
to be market leader

That is what you are looking for?
With Sigash Vitro it becomes reality!


…...........because of 30 years of experience in the field!
My experience can be an enormous advantage in the accomplishment of projects. I have:

The development of a new plantlet in vitro, so-called regeneration, still captivates me after 30 years. And today, I am still inspired and motivated by the possibilities which cell and tissue culture have in plant breeding. And with the development of novel breeding technologies, experience in the field of tissue culture is still key to realize new products.

the only Source of knowledge is expeRience

Albert Einstein

How can Sigash vitro create value for you?

By offering consultancy in the field of cell and tissue culture, biotechnology and product development for plant breeding in agricultural, horticultural, ornamental and forestry crops.

I gladly manage projects WITHIN YOUR COMPANY.

Sometimes, however, it is preferred to perform a project externally; for that purpose, I also offer to write and coach OUTSOURCED PROJECTS.


Dr. Sietske Stuiver-Hoekstra is my name and I was born in the Netherlands and graduated in biology at the Free University Amsterdam. In 1984 I started to work in the area of plant cell and tissue culture. I worked at ZaadUnie (now part of Syngenta), at TNO (the Netherlands Organisation for Applied Scientific Research) and Leiden University for Heineken, at the start-up company Mogen International, and at Zeneca and Syngenta and as a consultant I worked for a variety of small-sized up to multinational breeding companies.

As a teamleader, line manager and consultant I had the opportunity to work with a large variety of CROPS, including vegetables, fruits, cereals, ornamentals, legumes and trees.

I am experienced with many TISSUE CULTURE TECHNIQUES like (doubled) haploid production – anther and microspore culture, hy- and cybridization – protoplast fusion and regeneration, genetic engineering – transformation, somatic embryogenesis, cryopreservation, vegetative propagation, rooting, hardening off and storage.

In 2009 I founded my company Sigash Vitro, based in Germany; my activities are worldwide.


You would like to improve your plant breeding with tissue culture and plant biotechnology?

I am looking forward to receive your email at info[at]sigash.net
alternatively am I happy to answer the phone under +49 (0)160 766 4684

Still in doubt? Get convinced by these references:

“I highly recommend Sietske to anyone who wants to improve his plant breeding by means of tissue culture. Sietske is an inspiring, approachable and reliable consultant, with outstanding experience in tissue culture research and production, especially with haploid production.”
Rob Dirks, Deputy Director Research & Development Biotechnology at Rijk Zwaan in The Netherlands

“Sietske has many years of thorough experience with a wide range of tissue culture techniques including protoplast fusion and regeneration. She is a friendly and understanding person, who is dedicated, creative and thoughtful in managing projects. I highly recommend her as a consultant.”
Joep Lambalk, Managing Director at Enza Zaden Research & Development B.V. in The Netherlands

Kind regards,

Dr. Sietske Stuiver-Hoekstra