Regeneration of fertile plants from Helianthus nuttallii T&G and Helianthus giganteus L. mesophyll protoplasts.

Interspecific hybridisation in the genus Helianthus via somatic cell fusion is thought to play an important role in future sunflower breeding programs. The establishment of this technique requires, however, the development of single-cell-regeneration protocols. For this purpose, we applied a regeneration protocol recently developed for Helianthus annuus L.

Regeneration of fertile interspecific hybrids from protoplast fusions between Helianthus annuus L. and wild Helianthus species.

The use of interesting characteristics from wild Helianthus species in sunflower breeding is limited by poor crossability or sterility of interspecific hybrids. To overcome this barrier, mesophyll protoplasts of Sclerotinia sclerotiorum-resistant clones of Helianthus maximiliani, H. giganteus and H.

A regeneration protocol for sunflower (Helianthus annuus L.) protoplasts.

Hypocotyl protoplasts of four different Helianthus annuus genotypes were cultivated for 22-28 days in agarose droplets covered with liquid medium. In the first week, supplementation of the medium with plant growth regulators was at a 0.8/1 ratio of cytokinin and auxin followed by a high auxin concentration in the second week and a cytokinin to auxin ratio of 8/1 in the third and fourth week.

[A computerized database for problem patients in pediatric anesthesia].

A computerized database for use in pediatric anesthesia and in the perioperative care of patients with malformation syndromes and rare diseases is presented. A total of 2200 syndromes are listed, and the database contains helpful data, experience, guidelines and literature references relevant to about 500 rare diseases. The access to the databank, its structure and the probable benefits of the system are explained and discussed.