이탈리안라이그라스 예취시기가 종자 등숙 및 발아에 미치는 영향

Effect of Clipping Time on Seed Maturity and Germination in Italian Ryegrass (Lolium multiflorum Lam. Italicum)

이탈리안라이그라스의 청초 이용 및 종자 생산가능성을 검토코자 1986년 10월부터 이듬해 6월까지 Tetrone 등 7품종을 공시하여 예취시기를 각각 4월 10일 예취와 4월 30일 예취 및 무예취로하여 시험을 실시한 결과를 요약하면 다음과 같다. 1. 출수기는 K-11, T.N.T 등 품종이 늦었는데 각 품종 모두 예취시기가 늦을수록 출수기가 지연되고, 천입종은 직선적으로 감소하였다. 2. 입형은 입장, 입폭 및 입후 모두 무예취구에 비하여 예취시기가 늦을수록 작아지는 경향이며, 품종간에는 4배체 품종들이 2배체 품종들 보다 컸다. 3. 최초 발아율 및 발아세는 $25^{\circ}C$에서 15$^{\circ}C$ 보다 높았으며, 최종 발아율은 예취시기가 늦어질수록 낮았는데, 온도간에는 15$^{\circ}C$가 $25^{\circ}C$보다 다소 높았으며, 품종간에는 출수기가 빨랐던 품종들의 발아율이 높았다. 4. 발아 균일도는 $25^{\circ}C$가 15$^{\circ}C$보다 다소 좋았으며, 예취시기가 늦어질수록 낮아졌는데, 품종간에는 K-11 등 출수기가 빨랐던 것들이 발아가 균일 한 경향이며, 평균 발아일수는 $25^{\circ}C$보다 15$^{\circ}C$에서 길었고, 예취가 늦을수록 길었다. 5. 등숙관련 형질과 발아율 관계는 예취가 늦어질수록 출수가 늦어 발아율은 직선적으로 낮아지고, 천입종이 무거울수록 발아율이 높아지는 경향이었다.

Since seeds of Italian ryegrass should be imported every year, it is necessary to investigate the prossible production of seeds in Italian ryegrass field after rice. Seven Italian ryegrass varieties were planted on October 8, 1986 at National Honam Crop Experiment Station at Iksan and clippings were made on April 10 and April 30 in 1987. Headings of K-11 and T.N.T were earlier than those of Tetrone and Bettina. For all varieties tested, heading date was delayed and 1,000 grain weight was decreased linearly as the clipping was made later. Length, width and thickness of a grain were reduced by clipping and later clipping, while tetraploid varieties produced larger grains than diploid varieties. The germination percentage and germination speed at $25^{\circ}C$ were higher than at 15$^{\circ}C$. The final germination percentage was lower at the later clippings and was higher at 15$^{\circ}C$, and earlier varieties showed higher germination percentage. Uniformity of germination was greater at $25^{\circ}C$ and was decreased as the clipping was made later, and the eariler varieties such as K-11 were germinated more uniformly. Average number of days to germination was longer at 15$^{\circ}C$ than at $25^{\circ}C$ and was longer at later clipping. The germination percentage was decreased linearly as the heading was delayed, while it increased linearly as the 1,000 grain weight was increased.