1. Editorial

   EditorialNotes Pages: 3 - 3

2. A genetic study of popping quality in Sorghum (Sorghum bicolor (L.) Moench)

   • D. S. Murty
   • M. Singh
   • K. D. Nicodemus

   OriginalPaper Pages: 5 - 8

3. The importance of wild potato species resistant to the potato cyst nematode, Globodera pallida, pathotypes P₄A and P₅A, in potato breeding. I. Resistance studies

   • R. Chavez
   • M. T. Jackson
   • J. Franco

   OriginalPaper Pages: 9 - 14

4. The importance of wild potato species resistant to the potato cyst nematode, Globodera pallida, pathotypes P₄A and P₅A, in potato breeding. II. The crossability of resistant species

   • R. Chavez
   • M. T. Jackson
   • J. Franco

   OriginalPaper Pages: 15 - 22

5. Male-sterility in the grain amaranth (Amaranthus hypochondriacus ex-Nepal) variety Jumla

   • S. Gudu
   • V. K. Gupta

   OriginalPaper Pages: 23 - 26

6. Single-gene resistance to zucchini yellow mosaic virus in Cucurbita moschata

   • H. S. Paris
   • S. Cohen
   • R. Yoseph

   OriginalPaper Pages: 27 - 29

7. The induction in vitro of adventitious shoots in Rosa

   • Davina Lloyd
   • Andrew V. Roberts
   • Keith C. Short

   OriginalPaper Pages: 31 - 36

8. Genotypic control of chromosome pairing in amphiploids involving the cultivated oat Avena sativa L.

   • Hugh Thomas
   • N. Al-Ansari

   OriginalPaper Pages: 37 - 45

9. The probable genome donors to Arachis hypogaea L. based on arachin seed storage protein

   • T. G. Krishna
   • R. Mitra

   OriginalPaper Pages: 47 - 52

10. Interspecific hybrids of Cucumis metuliferus × C. anguria obtained through embryo culture and somatic embryogenesis

    • George Fassuliotis
    • B. V. Nelson

    OriginalPaper Pages: 53 - 60

11. Sources of resistance to tomato-yellow-leaf-curl-virus (TYLCV) in Lycopersicon species

    • M. A. Kasrawi
    • M. A. Suwwan
    • A. Mansour

    OriginalPaper Pages: 61 - 64

12. Identification of rye genotypes resistant to biotypes B, C, E, and F of the greenbug

    • J. M. Tyler
    • J. A. Webster
    • O. G. Merkle

    OriginalPaper Pages: 65 - 68

13. A new interspecific Lathyrus hybrid to introduce the yellow flower character into sweet pea

    • H. I. T. Khawaja

    OriginalPaper Pages: 69 - 75

14. Aspects of unconscious selection and the evolution of domesticated plants

    • Charles B. Heiser

    OriginalPaper Pages: 77 - 81

15. Hybridization in Brassica juncea × Brassica campestris through ovary culture

    • D. Mohapatra
    • Y. P. S. Bajaj

    OriginalPaper Pages: 83 - 88

16. Nonhost plant species as donors for resistance to pathogens with narrow host range. II. Concepts and evidence on the genetic basis of nonhost resistance

    • R. E. Niks

    OriginalPaper Pages: 89 - 99

17. Book reviews

    BookReview Pages: 101 - 103

18. News item

    Announcement Pages: 103 - 103