1. Editorial

   • Oluf L. Gamborg
   • Klaus Hahlbrock

   EditorialNotes Pages: 1 - 1

2. SI (international system of units)

   Legacy Pages: 2 - 2

3. Alkaloid production in Catharanthus roseus (L.) G. Don.

   • F. Constabel
   • S. Rambold
   • J. P. Kutney

   OriginalPaper Pages: 3 - 5

4. Activation of chloroplast-localized enzymes of quinolizidine alkaloid biosynthesis by reduced thioredoxin

   • Michael Wink
   • Thomas Hartmann

   OriginalPaper Pages: 6 - 9

5. Enzymic synthesis of γ-coniceine in Conium maculatum chloroplasts and mitochondria

   • M. F. Roberts

   OriginalPaper Pages: 10 - 13

6. Culture conditions of protoplast-derived cells of nicotiana sylvestris for mutant selection

   • I. Negrutiu
   • J. F. Muller

   OriginalPaper Pages: 14 - 17

7. The occurrence of free and bound cytokinins in plasmodia of Plasmodiophora brassicae isolated from tissue cultures of clubroots

   • H. M. Dekhuijzen

   OriginalPaper Pages: 18 - 20

8. Localisation of citrulline synthesis in the alder root nodule and its implication in nitrogen fixation

   • Alexander Scott
   • Isobel C. Gardner
   • Sheila F. McNally

   OriginalPaper Pages: 21 - 22

9. DNA replication during differentiation of cortical cells in Allium roots

   • M. J. Carmona
   • C. Gutiérrez

   OriginalPaper Pages: 23 - 25

10. In vitro pollination of maize (Zea mays L.) — Proof of double fertilization

    • L. Havel
    • F. J. Novák

    OriginalPaper Pages: 26 - 28

11. Chemical constituents of cultured cells of Euphorbia tirucalli and E. millii

    • Yoshikazu Yamamoto
    • Ryuzo Mizuguchi
    • Yasuyuki Yamada

    OriginalPaper Pages: 29 - 30

12. The uptake of copper by cell suspension cultures of Phaseolus vulgaris L. cv. SAXA

    • Werner Veltrup
    • Franz-Arnold Austenfeld

    OriginalPaper Pages: 31 - 33

13. Rapid clonal multiplication of Digitalis lanata in tissue culture

    • Ildiko Erdei
    • Zsuzsa Kiss
    • Pàl Maliga

    OriginalPaper Pages: 34 - 35

14. Indole alkaloids from cell suspension cultures of Rauwolfia serpentina benth

    • Joachim Stöckigt
    • Artur Pfitzner
    • Joachim Firl

    OriginalPaper Pages: 36 - 39

15. Chlorophyll synthetase in chlorophyll-free chromoplasts

    • Klaus Kreuz
    • Hans Kleinig

    OriginalPaper Pages: 40 - 42