Wheat Information Service No.13 
Contents
I. Research Notes:
S. Matsumura:Radiation effects of beta- and gamma-rays
in Triticum monococcum, p.1
T. Fujii:Preliminary experiments on the relation between
dose rate and radiation effect in Triticum monococcum, p.2
S. Kondo and H. Ishiwa:Calculation of absorbed dose
delivered to wheat seeds soaked in 32P and 131I aqueous
solutions, p.3
S. Matsumura, T. Mabuchi and S. Kondo:Boron effects
upon gamma-ray and thermal neutron irradiations in einkorn wheat, p.4
T. Ohta and S. Matsumura:On the mechanism of appearance
of gigas-plants from nullisomic dwarf wheat, p.5
K. Katsuya:Effects of radiation on the susceptibility
of wheat seedlings to leaf rust, p.5
D. Zohary and Z. Brick:Triticum dicoccoides
in Israel: Notes on its distribution, ecology and natural hybridization, p.6
M. Upadhya and M. S. Swaminathan:Karyotype of Triticum
zhukovskyi Men. et Er., p.9
M. S. Swaminathan and M. V. P. Rao:Macro-mutations
and sub-specific differentiation in Triticum, p.9
I. Nishiyama:An attempt to induce tetraploids with
AABB from Japanese wheat varieties with AABBDD, p.11
K. Nishikawa:Lethality and dwarfness of the hybrids
between Emmer and synthesized 6x wheats (Preliminary report), p.12
II. Genetic Stocks:
D. Zohary, M. Feldman, and Z. Brick:Seed collections
of Aegilops, Triticum and Secale, p.14
III. Editorial Remarks
Communication, Correction, Announcement and Acknowledgement, p.21,22
Committee; Explanation of the Figure on the Cover, ...Cover iii