CAJ | 학술논문

　　根据水稻品种穗型大小，将江苏省淮北地区近20年来选育的主要水稻品种分成两类，一类为偏大穗型品种，另一类为穗数型品种.本研究旨在探讨淮北地区偏大穗型水稻品种群体特征及生长发育特性.结果表明，与穗数型水稻品种相比，偏大穗型水稻品种每穗颖花数多，结实率稍低，千粒重相当；偏大穗型品种全生育期茎蘖数均少于穗数型品种，但分蘖成穗率高于穗数型品种；偏大穗型品种叶面积指数、光合势和干物质积累，生育前期与穗数型水稻品种没有明显差异，抽穗后则显著高于穗数型品种；偏大穗型品种各生育时期的根冠比、茎鞘物质运转率和收获指数与穗数型品种无明显差异，但抽穗后根系伤流量显著高于穗数型品种.提出了淮北地区偏大穗型水稻品种群体指标体系：总颖花量>5.0×104万m-2，结实率>85%，千粒重>26 g；茎蘖成穗率>80%，抽穗期叶面积指数7.5-8.0，全生育期光合势>5×106 m2·d·hm-2，成熟期总干重>22 t·hm-2，收获指数>0.50；抽穗期粒叶比〔颖花/叶（cm2）〕>0.58，根冠比>0.22，根系伤流量>5 g·m-2·h-1.
　　근거수도품충수형대소，장강소성회북지구근20년래선육적주요수도품충분성량류，일류위편대수형품충，령일류위수수형품충.본연구지재탐토회북지구편대수형수도품충군체특정급생장발육특성.결과표명，여수수형수도품충상비，편대수형수도품충매수영화수다，결실솔초저，천립중상당；편대수형품충전생육기경얼수균소우수수형품충，단분얼성수솔고우수수형품충；편대수형품충협면적지수、광합세화간물질적루，생육전기여수수형수도품충몰유명현차이，추수후칙현저고우수수형품충；편대수형품충각생육시기적근관비、경초물질운전솔화수획지수여수수형품충무명현차이，단추수후근계상류량현저고우수수형품충.제출료회북지구편대수형수도품충군체지표체계：총영화량>5.0×104만m-2，결실솔>85%，천립중>26 g；경얼성수솔>80%，추수기협면적지수7.5-8.0，전생육기광합세>5×106 m2·d·hm-2，성숙기총간중>22 t·hm-2，수획지수>0.50；추수기립협비〔영화/협（cm2）〕>0.58，근관비>0.22，근계상류량>5 g·m-2·h-1.
s: This study aimed to understand population characteristics of partial-large-panicle mid-season Japonica rice cultivars in North Huai River Areas. According to the differences in panicle types, more than 20 mid-season ja-ponica rice cultivars bred in recent 20 years could be classified into two groups, i.e., panicle-number cultivars and partial-large-panicle cultivars. Compared with the panicle-number cultivars, the partial-large-panicle cultivars had lower filled-grain percentage and tillers, while the partial-large-panicle rice had more spikelets per panicle and higher ratio of productive tillers than that of panicle-number cultivars. The leaf area index, photosynthetic potential and dry matter accumulation were at the same level for the two rice groups before heading stages and there were no significant differences in grain-leaf ratio, 1000-grain weight, harvest index and translocation percentage of the matter from stems for the two rice groups. The leaf area index, photosynthetic potential, root bleedings, and dry matter accumulation of partial-large-panicle rice cultivars after the heading stages were greater than those of panicle-number rice cultivars. The indexes for the population characteristics of partial-large-panicle rice were suggested, i.e., total spikelets>5.0 × 104 m-2, filled-grain percentage>85%, 1000-grain weight>26 g;ratio of productive tillers>80%, leaf area index at heading 7.5-8.0, photosynthetic potential during the whole growth period>5×106 m2·d·hm-2, total dry matter weight at maturity>22 t·hm-2, harvest index>0.50;grain-leaf ratio(No. of spikelets per cm2 leaf area)>0.58;root-shoot ra-tio at heading>0.22 and amount of root exudates>5 g·m-2·h-1.