1. Are Vavilov's law of homologous series and synteny related?

   • K. Hammer
   • I. Schubert

   Short communication Pages: 123 - 124

2. Biological characteristics of newly cultivated fodder plants for pastures of the arid zone in Uzbekistan

   • O. Kh. Khassanov
   • T. Rachimova
   • S. F. Tadzhiev

   Regular research papers Pages: 125 - 131

3. The origin of Manihot esculenta Crantz (Euphorbiaceae)

   • Antonio C. Allem

   Regular research papers Pages: 133 - 150

4. Powdery mildew resistance in Aegilops tauschii coss. and synthetic hexaploid wheats

   • Jürgen Lutz
   • Sai L. K. Hsam
   • Friedrich J. Zeller

   Regular research papers Pages: 151 - 158

5. Between and within cultivar variability in salt tolerance in lucerne, (Medicago sativa L.)

   • M.M. Al-Khatib
   • T. McNeilly
   • J.C. Collins

   Regular research papers Pages: 159 - 164

6. Genetic diversity and systematic relationships in sweetpotato (Ipomoea batatas (L.) Lam.) and related species as revealed by RAPD analysis

   • R. L. Jarret
   • D. F. Austin

   Regular research papers Pages: 165 - 173

7. Influence of ecological factors on population differentiation in perennial ryegrass (Lolium perenne L.)

   • Gilles Charmet
   • François Balfourier

   Regular research papers Pages: 175 - 184

8. Book reviews

   BookReview Pages: 185 - 185

9. Announcement

   Announcement Pages: 187 - 188