Cryopreservation of Digitalis lanata Shoot Tips.

A method for the preservation in liquid nitrogen of shoot tips (meristems) of D. LANATA is described. It includes the following steps: (a) hardening of shoots by cultivation at 4 degrees C for 8 weeks, (b) treatment of the explanted shoot tips with cryoprotectors, e.

Diversity of Vicia faba circular mtDNA in whole plants and suspension cultures.

A comparative analysis of the Vicia faba mitochondrial genome in whole plants and in longterm suspension culture has been conducted. Restriction fragment patterns of the mtDNA isolated from these two sources were notably different. Electronmicroscopic analysis also revealed significant differences.

Introduction of a nitrogen-fixing cyanobacterium into tobacco shoot regenerates.

Tobacco (Nicotiana tabacum L.) shoots associated with the nitrogen-fixing cyanobacterium Anabaena variabilis Kütz. (ATCC 29413) were regenerated in mixed cultures of tobacco callus and the cyanobacterium.