• 作者： 陳隆澤; 張萬來; 邱鳳廷
• 作者服務機構： 臺灣省農業試驗所嘉義試驗分所
• 中文摘要： 就182個水稻品種調查其穗上發芽性及休眠性在品種間之變異，並分析兩種性狀間之相關關
  係，其結果摘述如下：
  1. 水稻穗上發芽性在品種間變異甚大，有51.7%之品種在抽穗後35天其穗上發芽率即可
  達50%以上。
  2. 依品種之原產地及水稻型別而言，原產菲律賓、斯里蘭卡及韓國之秈稻品種具有較強之
  穗上發芽抵抗性，而美國稻之抵抗性最弱，其他地區之品種則介於兩者之間。一般具有強穗上發
  芽抵抗性之品種大多是秈稻。
  3. 秈稻品種之穗上發芽性與其生育日數間有極顯著之正相關，但?稻則呈不明顯之負相關
  。果皮有色澤之品種一般具有強穗上發芽抵抗性。
  4. 水稻品種之休眠性一般不長，但品種間差異頗大，供試品種中有63.2%之品種不具休眠
  性或只有1～3天之短期休眠性。
  5. 就地理分佈及型別觀之，原產菲律賓、斯里蘭卡及韓國之品種大多具有長短不等之休眠
  性，而日本、中國大陸、臺灣及非洲稻，則只有少數品種具短期之休眠性，美國稻則無休眠性。
  一般具有高度休眠性之品種均屬秈稻。
  6. 水稻品種之休眠性與其生育日數間有極顯著之相關性，但秈稻為正相關，?稻為負相關
  。果皮有色澤之品種大多具有較高之休眠性。
  7. 水稻品種之穗上發芽性與其休眠性間有極顯著之相關關係，不論秈稻或?稻皆然。一般
  具強穗上發芽抵抗性之品種其休眠性亦高。
  8. 就試驗結果選出嘉農秈6號、8號，臺農秈12號及IR661等四個具有強穗上發芽抵抗
  性而休眠性不長之秈稻品種頗適於本省之栽培，但?稻則仍無合適品種，因此加速育成具有強穗
  上發芽抵抗性?稻之品種實刻不容緩。h
• 英文摘要： A total of 182 varieties was investigatedfor the variability of pre-harvest sprouting, graindormancy and the relationship between these twocharacters. The results are briefly summarizedas follows: 1. The degree of pre-harvest, sproutingvaried with varieties. Of 182 entries, 94 (51.7%)showed 50 percent or more of pre-harvestsprouting at 35 days after heading. 2. When compared on the basis of originaland varietal type, Indica varieties from Philip-pines, Sri Lanka and Korea appeared to havethe highest resistance to pre-harvest sproutingwhereas those from America had the lowestresistance, and the others ranked between thetwo groups. In general, the Indica varieties hadhigher resistance to pre-harvest sprouting. 3. There was a positive correlationbetween pre-harvest sprouting and the growthduration in Indica rices while that of theJaponicas was negative and not significant.Varieties with coloured pericarp were moreresistant to pre-harvest sprouting than thosewithout colours. 4. The period of dormancy appeared tobe rather short, but differed markedly withvarieties. Among the entries, 105 or 63.2% didnot have dormancy or only had a very shortperiod. (ca., 1-3 days.) 5. When geographical distribution withvarietal type of rice was considered, the varietiesfrom Philippines, Sri Lanka and Korea appearedto have longer dormant periods. Only few varietiesfrom Japan, China mainland, Taiwan, and Africahad shorter dormant periods and those fromAmerica did not show any dormancy at all. Ingeneral, Indica varieties appeared to have longerdormant periods. 6. A positive correlation between dormantperiod and the growth duration was obtainedfor Indica rice varieties while Japonicas showedthe negative values. Varieties with colouredpericarp also appeared to have longer dormantperiods than those with colourless pericarp. 7. There was a close correlation betweenpre-harvest sprouting and the dormant period inIndica and Japonica rice varieties. Varietieswith higher resistance to pre-harvest sproutingalso had longer dormant periods. 8. Based on the results of this study,entries such as Chianung sen 6, 8, Tainung sen12 and IR661 appeared to have higher resistanceto pre-harvest sprouting with relatively shortdormant periods, and are therefore useful to ricegrowers, but there were no Japonica varietieswith satisfactory tolerance to the trait. Thissuggests that developing Japonica rice varietieswith higher resistant to preharvest sprouting isvery important in Taiwan.
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