Individual Variation and Selection Effectiveness on Regrowth after Summer of the Festulolium Cultivars in Cold Climates

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  • 寒冷地におけるフェストロリウム品種の越夏性に関する品種内変異と選抜効果
  • カンレイチ ニ オケル フェストロリウム ヒンシュ ノ エツカセイ ニ カンスル ヒンシュ ナイ ヘンイ ト センバツ コウカ

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The intra-cultivar variation of regrowth after summer (RAS) of the first harvest year, the selection effectiveness, and the effect of selection on dry matter yield after summer was surveyed for festulolium cultivars Evergreen, Tandem and Paulita grown in cold climates. Intra-cultivar variation in the RAS in Evergreen had a rectangular distribution : a low frequency of awned individuals showed poor regrowth and a high frequency of awnless individuals showed better regrowth. The mean RAS values for Tandem and Paulita differed, but both were similar in that they showed smaller variation than Evergreen. For both Tandem and Paulita, most individuals had awned glumes and this differed from Evergreen, which was predominated by awnless individuals. In all cultivars, the groups that showed poor RAS were relatively more susceptible to crown rust. Genetic gains, which were estimated using two prgenies from each polycross of Evergreen clones and of Tandemand Paulita clones revealed significant selection effectiveness (Evergreen, p<0.01 ; Tandem and Paulita, p<0.01 as tentative value). Yield trials using progeny lines showed that the over-summer dry matter yield of the progenies was significantly higher than that of the parent cultivars (Evergreen and Tandem) at the 1% significance level. Given this result, the selection effectiveness of RAS was shown to also affect yield.

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