1. Pollen-tube hypertrophy in ovules of Solanum and Lycopersicon following interspecific crosses

   • T. M. Gradziel1
   • M. Okada
   • D. A. St. Clair

   OriginalPaper Pages: 147 - 152

2. Ultrastructural changes in the appendix of the Sauromatum guttatum inflorescence during anthesis

   • H. Skubatz1
   • D. D. Kunkel
   • B. J. D. Meeuse

   OriginalPaper Pages: 153 - 170

3. Enzymatic isolation of viable nucelli at the megaspore mother cell stage and in developing embryo sacs in Nicotiana tabacum

   • Yan Wu
   • Chang Zhou
   • H. -Ulrich Koop

   OriginalPaper Pages: 171 - 175

4. Abortion and determination of stages for embryo rescue in crosses between sweet-potato, Ipomoea batatas Lam. (2n=6x=90) and its wild relative, I. trifida (H. B. K.) G. Don. (2n=2x=30)

   • José Mont
   • Masaru Iwanaga
   • Kazuo Watanabe

   OriginalPaper Pages: 176 - 182

5. A new look at incompatibility relationships in higher plants

   • B. R. Trognitz
   • P. E. Schmiediche

   OriginalPaper Pages: 183 - 190

6. The embellum: a newly defined structure in the grass ovule

   • N. Busri
   • G. P. Chapman
   • J. Greenham

   OriginalPaper Pages: 191 - 198

7. Effects of copper deficiency on pollen fertility and nucleic acids in the durum wheat anther

   • Z. Azouaou
   • A. Souvré

   OriginalPaper Pages: 199 - 204

8. Polarity of nuclear and organellar DNA during megasporogenesis and megagametogenesis in Plumbago zeylanica

   • B. Q. Huang
   • S. D. Russell

   OriginalPaper Pages: 205 - 211

9. Survival at 20° C and cryopreservation of isolated sperm cells from Zea mays pollen grains

   • P. Roeckel
   • C. Dumas

   OriginalPaper Pages: 212 - 216