1) young spike differentation and developmental
幼穗分化发育
2) dual-purpose genic male sterile line
幼穗发育
1.
The dual-purpose genic male sterile line indica rice Pei ai 64S and conventional rice cultivar Jingxian 89 were used as experimental materials.
以籼型两用不育系水稻培矮645和常规稻粳籼89为材料，采用PAGE分析同工酶的方法，比较水稻幼穗发育过程中花粉母细胞形成期、减数分裂期和花粉完熟期NAD＋-MDH和AP同工酶的变化，以期了解不育系的育性转换与表达机理。
3) spike differentiation
幼穗分化
1.
Preliminary study on the characteristic of young spike differentiation of wheat progenies with oat (Avena Sativa L.) exogenous DNA;
导入燕麦DNA的小麦变异后代幼穗分化特性的初步研究
2.
Observation of spike differentiation and flowering characteristics in Kentucky bluegrass
草地早熟禾幼穗分化过程及开花习性的观察
3.
) with different vernalization development characteristics were used to investigate the effects of accumulated temperature before wintering on spike differentiation by vernalization treatments and sowing dates experiment,and the effects were expressed by thermal time.
以3个春性、半冬性和冬性小麦品种为材料,采用分期播种和春化处理,以热时间为尺度,研究了冬前积温对不同春化发育特性小麦品种幼穗分化进程及主要穗分化期累积GDD(生长度日,growingdegree days)的影响。
4) young spike differentiation
幼穗分化
1.
This paper deals with the relation between the young spike differentiation of dif-ferent ecotypes of wheat at different sowing date and the effect of temperature.
研究了不同生态型小麦在春季分期播种条件下的幼穗分化过程与温度效应的关系。
2.
The studies on young spike differentiation of wheat were summarized.
对小麦幼穗分化的研究进行了概述，指出小麦幼穗分化进程与品种的遗传特性及温、光等生态因子密切相关，并直接影响着产量因素的构成及最终产量形成，小麦幼穗分化的研究对小麦育种及生产实践具有重要指导意义。
3.
Six different ecotype varieties of common wheat and F 1 derived from 6×6 complete diallel crossing system were selected for the research on the young spike differentiation characteristics.
选用６ 个不同生态类型小麦品种，采用完全双列杂交法，对亲本及杂种Ｆ１ 的幼穗分化特点进行比较研究。
5) young ear differentiation
幼穗分化
1.
Study on the young ear differentiation character and the technology of sprouting for ratooning rice;
再生稻幼穗分化特性及发苗技术研究
2.
The relation between growth period、young ear differentiation and seeds production of L.
对多花黑麦草在南京分期播种条件下生育进程和幼穗分化的变化及其与种子生产性能的关系进行了研究。
6) floret differentation and development
雌穗分化发育
补充资料：穗分化观测
穗分化观测
observation of ear-differentiation
suifenhua guanee穗分化观MlJ(observation of ear一differ-entiation)对禾本科作物幼穗发育进程中各阶段的观测。穗分化的开始标志着作物由营养生长进入生殖生长阶段。穗分化期是决定每穗粒数和最终产量的关键时期之一，此时对气象条件反应敏感。掌握穗分化进程，便于生产上及时采取技术措施，促进穗大粒多;在杂交制种上可用作父母本花期相遇预测时参考;在农业气象研究与服务中用于鉴定作物的农业气象条件和气候生态适应性。观测穗分化有目测、器测和推断三种方法。①目测法即剥检法。人工剥去裹在幼穗外的叶片，使完好的幼穗完全外露，用肉眼鉴别幼穗的发育阶段。此法简单易行，但因幼穗分化之初肉眼不易分辨，所以只适用于分化后期观察判断。②器测法即镜检法。借助于放大镜、解剖镜或显微镜观察裸露的幼穗的发育状态，从而判别其发育阶段。此法可详细观察或辨认幼穗的发育状态，准确可靠，尤其是花药发育的观察必须使用解剖镜或显微镜。③推断法即间测法。通过对植株外部形态或幼穗的外形、长度的观察或测量来间接判断幼穗分化的进程。此类方法很多，如叶龄指数法、叶龄余数法、穗长法和抽穗期倒推法等等。在没有仪器条件或要求较粗略的情况下，此法便于应用。但是不同作物与品种的植株外部形态或幼穗外形与幼穗发育进程的定量关系，必须通过大量的观察与测定后，才能确定。下表说明用叶龄指数法观测水稻幼穗分化各阶段的指标。水稻叶龄指数与幼穗发育阶段的关系叶龄指数序78一7981一8383一8890一9295一97 98 99 100 幼称发育阶段第一苞叶原基分化期第一次枝梗原基分化期第二次枝梗原基分化期雌雄蕊形成期花粉母细胞形成期花粉母细胞减数分裂二分体期花粉母细胞减数分裂四分体期花粉成熟期(大华杰)
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参考词条