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5. Near-isogenic lines: A total of 403 near-isogenic lines made by two methods of repeated selfing for heterozygotes and of repeated backcrossings. These lines are isogenic to so-called genetic backgrounds, except for any of the genes, uz (semi-brachytic growth), n (naked kernal), v (sixrow), l (dense spike), lk2 (short awn), K (hooded appendage), sh, Sh2, Sh3 (spring growth habit), dw's (dwarfness), etc.

6. Tetraploid lines: 22 lines from around the world.

7. Principal materials under investigation: 500 cvs from the Hokkaido Pref. Agr. Sta., Japan. 350 cvs and 450 mutants from Agr. Res. Center, Japan. 400 naked landraces from Tribhuwan Univ., Nepal.

8. Storage of the materials: (a) short-term storage of active seeds in polyethylene bottles (15C), (b)medium-term storage of active seeds in metal cases (15C), and (c)long-term storage of original seeds in polyethylene boxes (-18C).

9. Activities: The database has been established for about 5,300 cvs with 30 items for morphological, physiologial and genetic characteristics. As for 4023 of those cultivars, detailed information has been published in the "Catalogue of Barley Germplasm Preserved in Okayama University, 1983". The Center has been updating the system to the software 'UNIFY' in workstation to allow users in other facilities connection to the computer network.



Conservation of Wheat and Barley Genetic Resources in MAFF

Toshiaki Yamada

National Agriculture Research Center
Kanondai 3-1-1, Tsukuba 305, Japan


The current number of germplasm of wheat, barley, oats, rye, triticale and their relatives preserved in the Center Bank of the National Institute of Agrobiological Resources, Tsukuba, is shown in Table 1. A part of them is also preserved in the Sub-Banks of the National Agricultural Experiment Stations, including the National Agriculture Research Center. Some dozens of Elytrigia and Elymus clones are preserved in the Sub-Bank of the Kyushu National Agricultural Experiment Station. Almost two hundred clones of Hordeum bulbosum L. are preserved in the Sub-Banks of National Agriculture Research Center, Shikoku National Agricultural Experiment Station, National Center for Seeds and Seedlings, etc. They have been collected mainly by collecting missions and international exchange.

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