Conflicts of interest
The author declares that there is no conflict.
Contribution
The authors declare, there is no conflict of interest. The manuscript
has not been published yet, as an abstract or academic thesis,
and is not under consideration for publication elsewhere. The
publication is approved by all authors.
Acknowledgment
The author thanks the Botanical garden of Freie Universitaet
Berlin (Germany) for providing the plant material. We are grateful
to the colleague of succulent department for the collaboration.