1.Number |
The first letter is any one of the following letters
given for the geographical region where the variety was
originated from or collected in.
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2.Name |
Variety name |
3.Origin and 4.source
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The "origin" refers to the place where the cultivar was originated, while the "source" shows the place or institution from which it was introduced to our institute. |
5.History
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The history record of a variety is often accompanied by the following abbreviation that means as indicated:
The numerals in parenthesis indicate the year when
the variety was released. |
6.Covered or naked kernel
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7.Kernel rows
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8.Ear-awn type
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Ear-awn type is classified and abbreviated as follows
:
Awn type |
Ear type
(density) |
Lax |
Medium |
Dense |
Long awned |
LL |
ML |
DL |
Short awned |
LS |
MS |
DS |
(Normal) hooded |
LNK |
MNK |
DNK |
Elevated hooded |
LEK |
MEK |
DEK |
Subjacent hooded |
LSK |
MSK |
DSK |
Long awned in central row, and awnletted or awnless in lateral rows |
LLB |
MLB |
DLB |
Short awned in central row, and awnletted or awnless in lateral rows |
LSB |
MSB |
DSB |
Awnless or awnletted in central and lateral rows |
LOB |
MOB |
DOB |
Elevated hoods in central row, and awnless in lateral rows |
LEKB |
MEKB |
DEKB |
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9.Uzu semi-dwarf or normal
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10.Leaf-sheath hair
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Two numerals indicate the mixed condition of two
types |
11. Leaf tip color (anthocyanin pigmentation)
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12. Seedling type
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13. Heading time
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Earliness Heading time
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14. Stem length (cm)
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Average of three measurements of stems from ground level to the base of ear or collar As the materials for determining the following ear characters, except glume length, five "standard" ears taken from a variety were used. |
15. Ear length (cm)
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The measurement from ear base or colloar to uppermost lemma tip |
16. Awn length (cm)
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Average of 10 measurements of awns taken each from two central spikelets in the middle portion of 5 ears |
17. Glume length (mm)
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Average of 2 measurements of glumes with awn of the central spikelets in the middle portion of an ear |
18. No. of triplets
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Average of five ears |
19. Ear density (mm)
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Average length of rachis internodes excluede 2-3 upper- and lower-most ones |
20. Lemma color
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21. Kernel color
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22. 1000 kernel weight (g)
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Average of two measurements calculated from number of seeds in 5g samples |
23. Rachilla hair
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24. Vernalization requirement
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25-27. Reaction to powdery mildew races
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Reactions of the cultivars to three major Japanese mildew races, I, IV and IX (Hiura 1960) were determined.
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28. Reaction to BaYMV
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Reaction to a soil-borne virus, BYMV, was investigated using 20 plants of each variety grown in severely infested fields with two replications (Takahashi et al. 1966). Disease symptom was observed three or more times in early spring. The criteria adopted for grading are:
|
Mosaic symptom |
Leaf yellowing |
RR |
none |
none |
R |
slight |
slight |
M |
easily discernible |
evident yellowing in lower leaves |
S |
severe |
conspicuous yellowing with some necrosis |
SS |
very striking |
heavily stunted, and sometimes die | |
29. Brittleness of rachis
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This character is known to be governed by two dominant complementary genes Bt and Bt2 which are semi-allelic and locating on chromosome 3 (Takahashi and Hayashi 1964, Takahashi 1965). Genetic constitution of a variety was investigates using two kinds of F1's from the crosses to two different genotypes,
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30. Hybrid lethal seedling
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Hybrid lethal seedlings were found to occur in the presence of two complementary dominant genes, Lse and Lsm. The genes are abbreviated in the catalogue,
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31. Hybrid chlorosis
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Hybrid chlorosis was known to occur in the presence of two dominant complementary genes, Che on chromosome 4 and Cha (Takahashi and Hayashi 1972).
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32. Specific genes or characters
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In this column are listed only those genes or characters which have been established by genetic analyses or close observation. The genes for specific characters ara given in parenthesis with brief explanation.
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33. Name in Japanese or Chinese
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Name in Japanese or Chinese
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34. Image
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Spike / Seed Image
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