1. Characterization of three male-sterile mutants of Arabidopsis thaliana exhibiting alterations in meiosis

   • Brenda N. Peirson
   • Heather A. Owen
   • Christopher A. Makaroff

   Original Paper Pages: 1 - 16

2. Plastid differentiation during Cucurbita pepo (Cucurbitaceae) pollen grain development

   • M. Nepi
   • F. Ciampolini
   • E. Pacini

   Original Paper Pages: 17 - 24

3. Phosphorylation of style S-RNases by Ca²⁺-dependent protein kinases from pollen tubes

   • Caroline Kunz
   • Alan Chang
   • Marilyn A. Anderson

   Original Paper Pages: 25 - 34

4. Nuclear male sterility induced by pollen-specific expression of a ribonuclease

   • Xiao-yan Zhan
   • Hen-ming Wu
   • Alice Y. Cheung

   Original Paper Pages: 35 - 43

5. Correlation in the tolerance to ozone between sporophytes and male gametophytes of several fruit and nut tree species (Rosaceae)

   • J. I. Hormaza
   • K. Pinney
   • V. S. Polito

   Original Paper Pages: 44 - 48

6. Characteristics of self-incompatibility in Schlumbergera truncata and S. x buckleyi (Cactaceae)

   • Thomas H. Boyle

   Original Paper Pages: 49 - 53

7. An Arabidopsis mutant showing aberrations in male meiosis

   • Caiping He
   • Uday Tirlapur
   • Joseph P. Mascarenhas

   Original Paper Pages: 54 - 57