... opaque-2 mutant 奥帕克-2（玉米）突变体 open pollination 自由授粉 origin of crop 作物起源 ...
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另外，经分析可知，强迫自交的结实率比自由授粉的结实率要低。
In addition, the analysis showed that the forced self-setting rate is lower than the free pollination.
在温室大棚设施栽培条件下开展杂交、自交、自由授粉，野外昆虫辅助授粉。
Cross, self and opening pollination were conducted in the green house, the subsidiary pollination by insects was carried out outdoors.
以自由授粉群体和品系间杂种为对照，研究了甘蓝型油菜连续自交后代在胚胎发育上表现的效应。
The effects of successive inbreeding progenies of Brassica napus L. on the embryo development were studied in comparison with the open-pollinated population and hybrids from inbred lines.
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