2回刈り栽培向きホールクロップサイレージ用イネ新品種「ルリアオバ」の育成

書誌事項

タイトル別名
  • Ruriaoba, a New Rice Forage Variety for Double Harvesting
  • 2カイ カリ サイバイ ムキ ホールクロップサイレージヨウ イネ シン ヒンシュ 「 ルリアオバ 」 ノ イクセイ

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説明

Ruriaoba is a new paddy rice variety developed for whole crop silage (WCS) by the National Agricultural Research Center for Kyushu Okinawa Region in 2009. The variety was selected from mutants of "Taporuri," a traditional variety introduced from Taiwan. Taporuri has extremely high dry matter productivity as a whole crop and rapid growth from a ratooning crop. Taporuri is considered useful for WCS use with double harvesting. However, its panicle shatters easily, so it is unfavorable for practical use. Therefore, the shattering of Taporuri was improved. A hard shattering line was selected from mutants induced by gamma rays in the M_2 generation. The selected line was named "THS1" in the M_4 generation. THS1 has been tested for adaptability to WCS since 2007, mainly in Kyushu. It was recognized as an extremely high yielding variety as a whole crop when cultivated by double harvesting. It was officially registered as "Ruriaoba" by the Ministry of Agriculture, Forestry, and Fisheries of Japan in 2012. Its main characteristics are as follows. Ruriaoba is a glutinous variety with an extremely long culm. Ruriaoba is distinguished from the original variety Taporuri by its hard shattering of grains. Other agronomic traits are equivalent to those of Taporuri. When double-harvested, the total aerial yield of the first and second crops of Ruriaoba reached 2.2t/10a. Its yielding ability is equal to that of Taporuri. Ruriaoba is expected to possess true resistance genes to blast disease. Ruriaoba is also resistant to stripe virus disease. Ruriaoba is adaptable for WCS use on the plains of warm regions in Japan.

「ルリアオバ」は, 暖地向きの再生イネを利用する2回刈り栽培に適するホールクロップサイレージ (WCS) 用の水稲品種であり, 2012年4月に品種登録された。本品種は, 台湾のインディカ型のもち在来種「Taporuri」のγ線照射後代から難脱粒性を示す突然変異体として選抜, 育成された。脱粒性以外の特性は「Taporuri」とほぼ同一である。出穂期は育成地では「タチアオバ」より遅い "極晩生" に属するもち種である。極長稈で, 黄熟期に到達する頃には倒伏の可能性が大きくなるが, 「Taporuri」同様に生育初期から生育がきわめて旺盛である特性を生かし, 2回刈り栽培では「タチアオバ」を上回る地上部乾物収量が得られる。いもち病に対しては未同定の真性抵抗性を持ち, 圃場抵抗性は葉いもち, 穂いもちともに不明である。白葉枯病抵抗性は "中" で, 縞葉枯病には抵抗性を有する。

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