An Evaluation of Polycross Progenies of the High-yielding Genotypes Derived from a Variety "Fawn" in Tall Fescue (Festuca arundinacea Schreb.)

톨페스큐 품종(品種) "Fawn"에서 선발(選拔)된 몇가지 다수성(多收性) 유전자형(遺傳子型)의 다계교배(多系交配) 후대검정(後代檢定)에 관(關)한 硏究

This experiment was conducted to select genotypes that were high-yielding and adapted to the soil and weather conditions in Korea, from 13 Fawn deri ved progenies which represented in the previous study. Comparisons were made in various leaf and plant characteristics, and forage productivities, between the 13 polycross progenies of high-yielding Fawn and control varieties including Fawn, Alta, and Kentucky 31. The results obtained were summarized as follow; Genetic differences between the polycross progeny group and the control group were recognized in leaf fresh weight but those between two groups in leaf dry weight were not observed. Leaf area of all derived progenies and control varieties were appeared to have individual genetic differences and, moreover, the leaf area of the polycross progeny group was larger than that of the control. Differences between polycross progeny group and control group in leaf width were not significant. However, leaf length exhibited significant differences among all polycross progenies, and control varieties between two groups, and among polycross progenies but no differences were observed among control varieties. Tiller number, plant height, and plant width of the polycross progeny group were larger than those of the control varieties when measured before and after harvest. Panicle length among all polycross progenies and control varieties showed minor differences. However, significant differences were found between the polycross progeny group and control group, as well as among the polycross progenies and control varieties within each group in culm length. Above characteritics in the leaf fresh and dry weight, area and length, plant width and height, and tiller number showed positive correlations with the forage yields, respectively. Forage yields of the polycross progenies were higher than those of the control varieties and the variation of the yields among the genotypes were great.

우리나라의 기후(氣候), 토양(土攘)에 적합(適合)한 우수(優秀)한 톨페스큐의 인자형(因子型)을 선발(選拔)하기 위(爲)하여 품종(品種) Fawn에서 선발(選拔)된 다수성유전자형(多收性遺傳子型)의 13계통(系統)과 대비품종(對比品種)으로 Fawn, Alta, Kentucky 31등(等)을 공시(供試)하여 초형질(草形質) 및 엽형질(葉形質)과 사료수량(飼料收量)을 조사분석(調査分析)하여 얻은 몇가지 결과(結果)를 요약(要約)하면 다음과 같다. 엽생체중은 다계교배파생계통군(多系交配派生系統群)과 대비품종간(對比品種間)에 유전적(遺傳的)인 유의차(有意差)를 나타냈으며 건물중(乾物重)은 유의차(有意差)를 볼 수 없었다. 엽면적(葉面積)은 각계통품종간(各系統品種間) 및 다계교배파생계통군(多系交配派生系統群)과 대비품종군간(對比品種群間)에 유전적(遺傳的)인 차이(差異)를 나타냈으며 파생계통(派生系統)의 엽면적(葉面積)이 대비품종(對比品種)보다 넓었다. 엽폭(葉幅)은 다계교배파생계통군(多系交配派生系統群)과 대비품종군간(對比品種群間)에는 유의차(有意差)가 인정(認定)되지 않았으며 엽장(葉長)에서는 각계통품종간(各系統品種間), 군간(群間), 다계교배파생계통군(多系交配派生系統群)의 각계통간(各系統間)에 유의차(有意差)를 나타냈으나 대비품종군내(對比品種群內)의 각품종간(各品種間)에는 유의차(有意差)가 인정(認定)되지 않았다. 예취전후(刈取前後)의 1, 2次(차) 분얼수(分蘖數), 초장(草長) 및 주폭(株幅)은 모두 다계교배파생상(多系交配派生祥)이 대비품종군(對比品種群)에 비(比)하여 많았다. 수장(穗長)에서는 각품종계통간(各品種系統間) 및 대비품종간(對比品種間)에는 적은 유의차(有意差)를 나타냈고 간장(稈長)은 각품종계통간(各品種系統間), 군간(群間), 각군(各群)의 계통품종(系統品種)들간(間)에 고도(高度)의 유의차(有意差)를 보였다. 사료수량(飼料收量)과 분얼수(分蘖數), 엽생체중, 주폭(株幅), 엽면적(葉面積), 엽장(葉長), 엽건물중(葉乾物重) 및 초장등(草長等)과는 높은 정(正)의 상관(相關)을 보였다. 다계교배파생계통(多系交配派生系統)들이 대비품종(對比品種)들 보다 사료수량(飼料收量)이 더 많았으며 여러 가지 특성(特性)에서 우수(優秀)한 바 보다 나은 품종개량(品種改良)을 위(爲)한 인자형(因子型)의 선발(選拔)에 기여(寄與)케 될것이다.