1. Freeze-fracture observations on membranes of dry and hydrated pollen from Collomia, Phoenix and Zea

   • K. A. Platt-Aloia
   • E. M. Lord
   • W. W. Thomson

   OriginalPaper Pages: 291 - 298

2. Intracellular localisation of phytochrome in oat coleoptiles by electron microscopy

   • V. Speth
   • V. Otto
   • E. Schäfer

   OriginalPaper Pages: 299 - 304

3. A single positive phototropic response induced with pulsed light in hypocotyls of Arabidopsis thaliana seedlings

   • B. Stenitz
   • K. L. Poff

   OriginalPaper Pages: 305 - 315

4. Carbon and nitrogen metabolism in barley (Hordeum vulgare L.) mutants lacking ferredoxin-dependent glutamate synthase

   • A. C. Kendall
   • R. M. Wallsgrove
   • P. J. Lea

   OriginalPaper Pages: 316 - 323

5. Carbon and nitrogen metabolism in a barley (Hordeum vulgare L.) mutant with impaired chloroplast dicarboxylate transport

   • R. M. Wallsgrove
   • A. C. Kendall
   • P. J. Lea

   OriginalPaper Pages: 324 - 329

6. Changes in topography and function of thylakoid membranes following membrane protein phosphorylation

   • M. T. Black
   • P. Lee
   • P. Horton

   OriginalPaper Pages: 330 - 336

7. Effects of light and temperature on sporangiophore initiation in Pilobolus crystallinus (Wiggers) Tode

   • H. Kubo
   • H. Mihara

   OriginalPaper Pages: 337 - 339

8. Benzyladenine modulation of the expression of two genes for nuclear-encoded chloroplast proteins in Lemna gibba: Apparent post-transcriptional regulation

   • Susan Flores
   • Elaine M. Tobin

   OriginalPaper Pages: 340 - 349

9. Correlation between infection by Rhizobium leguminosarum and lectin on the surface of Pisum sativum L. roots

   • C. L. Díaz
   • P. C. van Spronsen
   • J. W. Kijne

   OriginalPaper Pages: 350 - 359

10. Movement and compartmentation of abscisic acid in guard cells of Valerianella locusta: Effects of osmotic stress, external H⁺-concentration and fusicoccin

    • R. Behl
    • W. Hartung

    OriginalPaper Pages: 360 - 368

11. Appearance of nitrite reductase in cotyledons of the mustard (Sinapis alba L.) seedling as affected by nitrate, phytochrome and photooxidative damage of plastids

    • V. K. Rajasekhar
    • H. Mohr

    OriginalPaper Pages: 369 - 376

12. Plasmodesmatal frequency and radial translocation rates in ray cells of poplar (Populus x canadensis Moench ‘robusta’)

    • J. J. Sauter
    • S. Kloth

    OriginalPaper Pages: 377 - 380

13. Characterization of the glutamate/aspartate-transport system in a symbiotic Nostoc sp.

    • P. Strasser
    • G. Falkner

    OriginalPaper Pages: 381 - 385

14. Patatin, a major soluble protein of the potato (Solanum tuberosum L.) tuber is synthesized as a larger precursor

    • B. Krischner
    • H. Hahn

    OriginalPaper Pages: 386 - 389

15. Enzyme activities in mitochondria isolated from ripening tomato fruit

    • D. Jeffery
    • P. W. Goodenough
    • P. D. J. Weitzman

    OriginalPaper Pages: 390 - 394

16. Microcallus formation from maize protoplasts prepared from embryogenic callus

    • C. W. Imbrie-Milligan
    • T. K. Hodges

    OriginalPaper Pages: 395 - 401

17. Regulation in tobacco callus of enzyme activities of the nicotine pathway

    • F. Feth
    • R. Wagner
    • K. G. Wagner

    OriginalPaper Pages: 402 - 407

18. Regulation in tobacco callus of enzyme activities of the nicotine pathway

    • R. Wagner
    • F. Feth
    • K. G. Wagner

    OriginalPaper Pages: 408 - 413

19. The quantitative relationship between gibberellin A₁ and internode growth in Pisum sativum L.

    • T. J. Ingram
    • J. B. Reid
    • J. MacMillan

    OriginalPaper Pages: 414 - 420

20. Sodium, potassium, chloride and proline concentrations of chloroplasts isolated from a halophyte, Mesembryanthemum crystallinum L.

    • B. Demmig
    • K. Winter

    OriginalPaper Pages: 421 - 426

21. Erratum

    Erratum Pages: 426 - 426