紀要論文 縞葉枯病抵抗性で糖含有率が高い稲発酵粗飼料専用品種「つきすずか」の育成

中込, 弘二  ,  出田, 収  ,  重宗, 明子  ,  松下, 景  ,  春原, 嘉弘  ,  石井, 卓朗  ,  飯田, 修一

(18)  , pp.41 - 51 , 2018-03-28 , 国立研究開発法人 農業・食品産業技術総合研究機構 , National Agriculture and Food Research Organization (NARO)
ISSN:2432-809x
内容記述
「つきすずか」は,当研究センターにおいて,飼料特性が優れる「中国飼 198 号(たちすずか)」を母,縞葉枯病抵抗性を持つ「ホシアオバ」の突然変異体系統「多収系 1066」を父とする交配後代より選抜・育成された稲発酵粗飼料用品種である.出穂期は,「たちすずか」と同じ“かなり晩”に属し,出穂性における感光性程度は「たちすずか」より強い.稈長は「たちすずか」並の“極長稈”である.穂長は「たちすずか」より短く,穂数は「たちすずか」並である.縞葉枯病に抵抗性である.いもち病については,真性抵抗性遺伝子“Pib,Pik-m,Pi20”を持つと推定される.葉いもち,穂いもちともに圃場抵抗性程度は不明である.黄熟期乾物収量は「たちすずか」並であり,籾重割合は「たちすずか」より少ない 2.8%程度である. 稲体の糖含有率は 17%程度で,「たちすずか」並に高い.晩植と疎植を組み合わせた栽培条件での採種試験における「つきすずか」の採種量は「たちすずか」並で,300㎏/10a 程度の種子を生産することができる.以上のことから,「つきすずか」は,既に「たちすずか」が普及している地域での導入が容易であり,また,「たちすずか」の栽培が困難であった縞葉枯病多発地でも良質な稲発酵粗飼料の生産が可能である.Rice whole-crop silage (WCS) has attracted attention in Japan as a domestic feed. However, a portion of the grains in rice WCS are undigested and excreted in the feces of the cattle eating the feed, and this loss of nutrients should not be disregarded. The low sugar content of conventional rice plants, which is considered to be a cause of silage deterioration, is also a problem.‘Tachisuzuka’, a rice cultivar that has a short panicle and was bred in 2010 for WCS production, has gained popularity in regions to the west of Kanto for its high proportion of stems and leaves digestible by cattle, high plant sugar content, and high resistance to lodging. However,‘Tachisuzuka’ is susceptible to rice stripe disease and is therefore difficult to cultivate in areas in which rice stripe disease tends to occur.‘Tsukisuzuka’ is a new rice cultivar for use in WCS. It has resistance to rice stripe disease and was selected from the progeny of a cross between Chugoku-shi198 (later named‘Tachisuzuka’) and Tashuukei1066.The heading date of‘Tsukisuzuka’ is classified as ‶very late” in western Japan and the photoperiodic sensitivity is slightly greater than that of‘Tachisuzuka’. The culm length of‘Tsukisuzuka’ is ‶very long”, almost equal to that of ‘Tachisuzuka’. The panicle length is shorter than that of‘Tachisuzuka’ and the panicle number is equal to that of ‘Tachisuzuka’.The whole-crop dry matter yield during the yellow ripe stage is almost equal to that of‘Tachisuzuka’, and the percentage of unhulled rice by weight is lower than that of‘Tachisuzuka’ at around 2.8%. The sugar content of the ‘Tsukisuzuka’ plant is as high as that of‘Tachisuzuka’ at about 17%. The content of feed components such as fiber in ‘Tsukisuzuka’ is equal to that of‘Tachisuzuka’.It is therefore easy to use‘Tsukisuzuka’ in the area where‘Tachisuzuka’ is already used, and‘Tsukisuzuka’ is expected to contribute to the stable production of high-quality rice WCS in areas where rice stripe disease tends to occur.
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