杂种优势

It is an effective way to use chemical hybridizing agents to produce hybrid seed in wheat.

应用化学杂交剂诱导雄性不育是小麦杂种优势利用中一条重要而简捷的途径。

Using genetic distance as independent variable and heterosis as depend variable, we carried out regressing analyses.

以遗传距离为自变量，杂种优势为依变量，进行回归分析。

According to cytology, biology, oil chemical characteristic and castor-oil plant's physical and chemical properties, it surveys both domestic and international research on the progress and development of castor-oil plant hereditary improvement, hybrid vigour utilization and comprehensive utilization.

研究立足于蓖麻遗传多样性及其植物质能的综合利用潜势，根据蓖麻雌雄同株的细胞学、生物学和油脂化学特性和毒蛋白的物化性质，综述国内外有关蓖麻生物学、遗传育种、杂种优势及综合利用的进展与研发前景。

Castor-oil plant ; hereditary improvement ; heterosis ; oil ; comprehensive utilization

蓖麻；遗传改良；杂种优势；油脂；综合利用

This item is mainly carry on close origin of original grow at first then further and purely expand big area through cross-fertilize to make technique research and extend a new product in order to do experiment demonstration and popularization.

项目简介：采用国内外第一项&瓜果超低温育种&的成功技术，选育性状稳定的两个亲本杂交，选育出杂种优势强的籽用南瓜新品种。

This paper studied relative characters and correlation of three ear leaf for 15 high combining inbred lines for select better inbred lines.studied that parents selected and mated,predicted heterosis.

通过对15个高配合力亲本自交系及其组配的8个杂交种棒三叶有关性状及相关性的研究，揭示优良自交系的特征，探索亲本的搭配，予测杂种优势的大小。

The superdominance effect and the dominance effect took the main function in the genetic basis of heterois of sorghum x sudan grass.

超显性效应和显性效应在高丹草杂种优势的遗传基础中占有主导地位。

Maize inbreds belonging to 3 maize heterotic groups including Reid, Tangsipingtou and compound germplasm were studied to determine the influence of genotypes, media and plant regulators on the embryo-derived calius induction and green plant regeneration. Immature embryos (1.0~2.0 mm) from selfed ears were harvested as explants. Callus could be induced from all the tested inbreds. However, plant regeneration was only obtained in 12 genotypes.

以Reid、唐四平头和其它种质等3个杂种优势类群共19份玉米自交系为试验材料，以玉米幼胚作为外植体，研究了基因型、培养基和激素对玉米幼胚愈伤组织的诱导及植株再生的影响，结果表明供试材料均能进行愈伤组织的诱导，但是仅有12个自交系能再生植株。N6和改良N6培养基有助于提高愈伤组织的质量及其生长速度。2，4-D在愈伤组织的诱导中起着关键性作用。

Seven restorers were selected out of 15 resource materials, based on their complete restoring ability to both of the ms lines.

利用这7个恢复系与湘油66A所配的组合在品种比较试验中表现出不同程度的杂种优势，6个组合均比对照增产，增产幅度为2.28％～19.21％，其中有3个组合的增产幅度在10％以上。

Male sterility of wheat inducing by Chemical hybridization agents is one of the main ways to produce hybrid wheat seed.

应用化学杂交剂诱导雄性不育是小麦杂种优势利用的重要途径之一。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。