CAJ | 학술논문

将3个杂交种的S_1代玉米育种材料等分成2份,在97 500株/hm~2和60 000株/hm~2两种种植密度下连续自交选择3代,测定 S_3的配合力;再从上述3个基础材料的不同密度选系中各取两个GCA相对较高的S_3所对应的S_4分别与昌7-2杂交形成12个杂交组合.采用组合和氮肥二因素随机区组设计,分析不同密度的选系对氮肥的反应.结果表明,同一基础育种材料两种密度的选系对肥力的反应不同,高密度选系组合产量的平均值在低、中、高3个肥力水平分别高于低密度选系组合62.94%、16.46%和8.99%;不同肥力对高、低密度选系组合穗部行粒数和千粒质量的影响较大,在低肥水平条件下,高密度选系组合的行粒数和千粒质量较低密度分别增加4.7粒和35.7 g;中肥水平条件下行粒数增加2.5粒;高肥水平条件下千粒质量增加25.3 g,差异均达显著水平.
장3개잡교충적S_1대옥미육충재료등분성2빈,재97 500주/hm~2화60 000주/hm~2량충충식밀도하련속자교선택3대,측정 S_3적배합력;재종상술3개기출재료적불동밀도선계중각취량개GCA상대교고적S_3소대응적S_4분별여창7-2잡교형성12개잡교조합.채용조합화담비이인소수궤구조설계,분석불동밀도적선계대담비적반응.결과표명,동일기출육충재료량충밀도적선계대비력적반응불동,고밀도선계조합산량적평균치재저、중、고3개비력수평분별고우저밀도선계조합62.94%、16.46%화8.99%;불동비력대고、저밀도선계조합수부행립수화천립질량적영향교대,재저비수평조건하,고밀도선계조합적행립수화천립질량교저밀도분별증가4.7립화35.7 g;중비수평조건하행립수증가2.5립;고비수평조건하천립질량증가25.3 g,차이균체현저수평.
Dividing the breeding materials of three hybrids into two parts,the S_3 combining ability was determined growing three generations in 97500 plants/hm~2 and 60000 plants/hm~2 of planting density respectively by self-crossing. S_4 lines,which produced by S_3 with relatively high GCA in each planting density population,were selected to cross with "Chang7-2" to form 12 crossing combinations. Two factors combining maize varieties with N fertilizers were used to study the response of density-selected crossing combinations to N fertilizer on the base of the randomized block design. The results showed that the response to N fertilizer was different between the high- and low-density-selected lines with the same genetic background. Mean yields of crossing combination of high-density-bred lines in low,middle and high N fertilizers were higher than those of crossing combination of inbred lines bred in the low density,by 62.94%,16.46% and 8.99% respectively. Grain number per ear and 1000-grain weight of maize crossing combinations originated from two planting density populations were significantly affected by fertilizer levels. The grain number per ear and 1000-grain weight of high-density-selected crossing combination were higher than those of low-density-selected crossing combination by 4.7 grains and 35.7 grams respectively in low fertility level; 2.5 grains added in middle fertility level; 25.3 grams added in high fertility level.