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Mineasahi

Parents: Kanto No.79 (seed parent) and 40-11 (pollen parent). Crossed in 1966. Bred by Aichi Prefectural Agricultural Experiment Station (cross) → its Inahashi Branch (now the Mountain Technology Experimental Farm, Aichi Agricultural Research Center).

Chubu No.17 CYB0000170

Pedigree

Skip the diagram and read the list
Norin No.22 → Koshihikari Norin No.1 → Koshihikari Norin No.8 → Norin No.22 Norin No.6 → Norin No.22 Moritawase → Norin No.1 Rikuu No.132 → Norin No.1 Ginbozu → Norin No.8 Asahi → Norin No.8 Joshu → Norin No.6 Sen'ichi → Norin No.6 Rikuu No.20 → Rikuu No.132 Kamenoo No.4 → Rikuu No.132 Aikoku → Rikuu No.20 Koshihikari → Kanto No.79 Kanto No.79 → Mineasahi Mineasahi → Aichinokaori Aichinokaori → Asahinoyume 40-11 → Mineasahi Mineasahi Chubu No.17 Kanto No.79 40-11 Koshihikari Etsunan No.17 ・ 32.6% Norin No.22 Kinki No.34 Norin No.1 Hokuriku No.4 Moritawase Rikuu No.132 Rikuu No.20 Kamenoo No.4 Aikoku Norin No.8 Kinki No.15 Norin No.6 Kinki No.9 Joshu Sen'ichi Ginbozu Asahi Aichinokaori Aichi No.70 ・ 0.8% Asahinoyume Aichi No.93 ・ 1%
The diagram shows this variety's own parents and the line that connects it to Koshihikari. Among the descendants only the main varieties are drawn; the other parent of each cross, and every descendant not drawn here, are listed in full below. Faint boxes are unnamed breeding lines.

Parents

Cross combination: 関東79号/40-11

Descendants

Relations are counted along the shortest line of descent. The rows in the diagram follow the order of crosses, so a variety with more than one path down can sit lower in the diagram than its relation here suggests.

Children 1

Grandchildren 1

The mother is not a variety but a line inside one

"Chubu No.17" was crossed in 1966 at the Aichi Prefectural Agricultural Experiment Station, taking the good-eating line of "Kanto No.79" as the mother and, with the aims of shortening and strengthening the culm and strengthening blast resistance, "40-11" (later Kiho, bred at the station's Inahashi Branch) as the father

Look at how the mother is written.

taking the good-eating line of "Kanto No.79" as the mother

Not Kanto No.79 itself, but the "good-eating line" within it.

Kanto No.79 is a mutant line raised by gamma-irradiating Koshihikari. Out of that line, a still better-eating selection was taken as the mother.

This site's pedigrees join variety to variety with a line. What the source writes here is a part of a variety. The diagram draws the line from Kanto No.79, but the source is pointing one step finer — and this page records that.

The father became a word only in this document

NARO's listing gives this variety's cross combination as "Kanto No.79/40-11". A notation does not tell you which is the father. By convention what precedes the "/" is the mother, but this site does not assert what is not written in words.

This historical document wrote the word.

"40-11" … as the father

"As the father." That lets 40-11 be recorded as the father.

The same bracket says one more thing: 40-11 later became "Kiho."

On this site 40-11 had appeared only as a notation, a parent of Hatsuboshi — Koshihikari/40-11 gave Hatsuboshi, and Hatsuboshi became a parent of Hitomebore. Now we know it carried another name.

The replacement is written as a share of each variety

The planting shares by variety in the mid-mountain district are: Akibare 50%, Minehikari 17%, Ozora and Harebare 11% each, Nipponbare 7%, other varieties a few per cent.

From the above, Chubu No.17 is wanted for adoption as a recommended variety, to replace all of the Ozora in this district, 80% of the Minehikari, 15% of the Akibare and 60% of the other varieties.

All of the Ozora, 80% of the Minehikari, 15% of the Akibare, 60% of the rest.

The historical documents this site has read mostly end in words like "judged suited", "giving consideration", "planned" — Obakowase's three prefectures were every one of them still "examining".

This document is different. It writes what fraction of which variety it will displace, in figures. The report is from 1980, the newest historical document on this site.

The reasons on the displaced side are written out too.

Minehikari is strong against brown spot, suits autumn-declining land and is strong against blast, but in recent years damage from bacterial leaf blight has stood out, sprouting in the panicle is extremely easy, and its yield and the market assessment of its rice have been pointed out as insufficient.

Ozora, meanwhile, has expanded in early-planted cultivation on the flat country and lately is even seen in the mid-mountain district. It is comparatively high-yielding here too and its planting has risen sharply, but it lodges much, its suitability for mechanisation is poor, and it has come to hinder stable production.

"Its suitability for mechanisation is poor." A variety that lodges cannot be cut by machine. By 1980 that enters the case for adoption.

Ozora is recorded on this site too, but has no historical document and so no page of its own. The record of what was displaced has to be read out of the document of what displaced it.

Four places where the transcription has broken down

This document carries four spots that appear to have broken in digitisation.

As written Should be
出徳期 (segregation in … was seen) 出穂 — heading date
極数は中位 穂数 — panicle number
カラバ工 カラバエ — stem maggot
奨助品種 奨励品種 — recommended variety

All are quoted as they stand.

The newer documents appear to carry more of this damage. The old ones were set in type; the new ones were read straight off paper. The flaws in the sources are collected at Flaws in the sources.

Sources disagree

Which parent of Koshihikari was the seed parent

The NARO historical document states in words that Norin No.22 was the seed parent and Norin No.1 the pollen parent. Niigata Prefecture, which bred the variety, states the reverse. The diagram follows the historical document; Niigata's account is recorded here. We call neither wrong.

The year of the cross

The NARO documents appear to reproduce the prefectures' original applications for recommended-variety status and give 1945 — and the documents for Honenwase, Hatsunishiki and Yamasenishiki, all from the same cross, give 1945 as well, four in agreement. Niigata's own account says the cross was made in 1944 and that the 1945 planting was skipped for lack of hands. We use 1944 and note the discrepancy.

How the seed parent of Norin No.1 is written

The two spellings appear in the same NARO database, in the pedigree field and in the historical document respectively. We use the pedigree field's spelling and list the other.

How Kamenoo No.4 is written

We follow the NARO database. The commonly seen spelling uses a katakana no; we prefer the spelling we can cite.

On naming

Variety names are proper nouns. We use a name in this language only where a published source for it can be cited; otherwise the Japanese name stands.

What we have not yet confirmed

We have not looked below the top twenty

The site covers the twenty most widely planted varieties of the 2024 crop and the varieties that connect them back to Koshihikari. Many descendants exist below that line; we have not yet verified them against primary sources.

The year Masshigura was crossed

Neither Aomori Prefecture's table of recommended-variety characteristics nor the NARO database gives the year Masshigura (Aokei No.138) was crossed. The cross itself, Ou No.341 / Yamagata No.40, and its adoption as a recommended variety in fiscal 2004 are confirmed from primary sources; the year of the cross is not. For the same reason we do not say which parent was the seed parent. On 8 October 2026 we went back to the breeder's own side. The Masshigura page in the variety database of the Aomori Prefectural Industrial Technology Research Center's Agriculture and Forestry Research Institute carries a heading reading “The origin of Masshigura” — with nothing under it. Of the institute's bulletins, only No.42 (2015) onward are online, and the issue that would hold the breeding report for Masshigura is not among them. So the year of the cross is absent from the breeder's own published material as well.

Sources

The source document is in Japanese.

  1. イネ品種データベース検索システム「越南17号（コシヒカリ）」品種来歴文書 — Institute of Crop Science, NARO ・ primary source ・ accessed 2026-09-10
  2. イネ品種データベース検索システム 交配系譜図「越南17号」 — Institute of Crop Science, NARO ・ primary source ・ accessed 2026-09-10
  3. イネ品種データベース検索システム「北陸4号（水稲農林1号）」品種来歴文書 — Institute of Crop Science, NARO ・ primary source ・ accessed 2026-09-10
  4. イネ品種データベース検索システム 交配系譜図「北陸4号」 — Institute of Crop Science, NARO ・ primary source ・ accessed 2026-09-10
  5. イネ品種データベース検索システム「北陸4号を親とする品種一覧」（全263行） — Institute of Crop Science, NARO ・ primary source ・ accessed 2026-10-01
  6. イネ品種データベース検索システム「越南17号を親とする品種一覧」（全607行） — Institute of Crop Science, NARO ・ primary source ・ accessed 2026-10-01
  7. イネ品種データベース検索システム 交配系譜図「近畿34号（水稲農林22号）」 — Institute of Crop Science, NARO ・ primary source ・ accessed 2026-10-01
  8. イネ品種データベース検索システム 交配系譜図「近畿15号（水稲農林8号）」 — Institute of Crop Science, NARO ・ primary source ・ accessed 2026-09-10
  9. イネ品種データベース検索システム 交配系譜図「近畿9号（水稲農林6号）」 — Institute of Crop Science, NARO ・ primary source ・ accessed 2026-09-10
  10. イネ品種データベース検索システム 交配系譜図「陸羽132号」 — Institute of Crop Science, NARO ・ primary source ・ accessed 2026-09-10
  11. イネ品種データベース検索システム 交配系譜図「陸羽20号」 — Institute of Crop Science, NARO ・ primary source ・ accessed 2026-09-10
  12. コシヒカリのエピソード1 〜交配から系統の育成まで〜 — Niigata Prefectural Government ・ primary source ・ accessed 2026-09-10
  13. 新潟コシヒカリの軌跡 〜誕生から定着に至るまで〜 — Niigata Prefectural Government ・ primary source ・ accessed 2026-09-10
  14. 戦後日本のイノベーション100選「コシヒカリ」経緯 — Japan Institute of Invention and Innovation ・ accessed 2026-09-10
  15. 令和6年産 水稲の品種別作付割合 — Rice Stable Supply Support Organization ・ primary source ・ accessed 2026-09-10
  16. イネ品種データベース検索システム 交配系譜図「関東79号」 — Institute of Crop Science, NARO ・ primary source ・ accessed 2026-09-10
  17. イネ品種データベース検索システム 交配系譜図「中部17号」 — Institute of Crop Science, NARO ・ primary source ・ accessed 2026-09-10
  18. イネ品種データベース検索システム 交配系譜図「愛知70号（あいちのかおり）」 — Institute of Crop Science, NARO ・ primary source ・ accessed 2026-09-10
  19. イネ品種データベース検索システム「愛知70号（あいちのかおり）を親とする品種一覧」 — Institute of Crop Science, NARO ・ primary source ・ accessed 2026-09-10
  20. あきさかりの良さを引き出す栽培法 — Fukui Prefectural Government ・ primary source ・ accessed 2026-09-10
  21. ぎふクリーン農業／県産品種 ハツシモ — Gifu Prefectural Government ・ primary source ・ accessed 2026-09-11
  22. 水稲「あさひの夢」の奨励品種採用（研究成果情報） — National Agricultural Research Center, NARO ・ primary source ・ accessed 2026-09-11
  23. コシヒカリのエピソード2 〜奨励品種への採用から〜 — Niigata Prefectural Government ・ primary source ・ accessed 2026-09-10
  24. コシヒカリBLの導入のねらい — Niigata Prefectural Government ・ primary source ・ accessed 2026-09-10
  25. イネ品種データベース検索システム「中部17号（ミネアサヒ）を親とする品種一覧」 — Institute of Crop Science, NARO ・ primary source ・ accessed 2026-09-11
  26. 水稲新奨励品種「あさひの夢」の特性 — Tochigi Prefectural Agricultural Experiment Station ・ primary source ・ accessed 2026-09-11
  27. あいちの農産物 穀類・茶 — Aichi Prefecture ・ primary source ・ accessed 2026-09-11
  28. イネ品種データベース検索システム「近畿15号（水稲農林8号）」品種来歴文書 — Institute of Crop Science, NARO ・ primary source ・ accessed 2026-09-16
  29. イネ品種データベース検索システム「近畿9号（水稲農林6号）」品種来歴文書 — Institute of Crop Science, NARO ・ primary source ・ accessed 2026-09-16
  30. イネ品種データベース検索システム「越南12号（ヤマコガネ）」品種来歴文書 — Institute of Crop Science, NARO ・ primary source ・ accessed 2026-10-01
  31. イネ品種データベース検索システム「山陰47号（ヤエホ）」品種来歴文書 — Institute of Crop Science, NARO ・ primary source ・ accessed 2026-10-01
  32. イネ品種データベース検索システム「中部17号（ミネアサヒ）」品種来歴文書 — Institute of Crop Science, NARO ・ primary source ・ accessed 2026-10-01