查询词典 heterosis

It had been shown that hybrids have significant midparent heterosis and dominant effect, hybrid growth response to submergence was controlled by the parents, but the effects of restorer lines were stronger than CMS lines, e.

对生产上主栽的三系杂交组合及其与亲本耐淹涝能力的关系进行了比较研究，确定杂交稻的耐淹涝能力的平均优势明显，显性效应为主。

The equations of heterosis areV(subscript F1)=(l/2)Na^2+(l/4)Nd^2+Vsubscript I(F1additive dominance F1 epistasisV=(1/2)Na^2+(l/2)V1,additive parental epistasisV=(1/4)Nd^2+Vsubscript I(F1+(1/2)Vl,dominance F1 epistasis parental epistasis.where N is number of genes controlling a trait,α=P(subscript i-P/2, d is deviation from midparent, while the variance components are all indicated by their names under the repective terms.

由一个二项分布随机变数及其推广至多项分布推导出杂种优势的公式：V(下标 F1)=Na^2/2+Nd^2/4+V下标(F1加性显性 F1上位V＝Na^2/2+V/2加性亲代上位V＝Nd^2/4+V下标(F1+V/2显性 F1上位亲代上位在此N=控制性状的基因数，α=p(下标 i-P/2， d=离中亲的偏差，而各方差则如方程底部所列。

The phenotypic mean values for the three populations and the midparental heterosis values for the two backcross populations were used for quantitative trait locus mapping and analysis, the genetic basis and correlations betweent the traits were analysed.

将三个群体的表型值和两个回交群体的中亲优势值进行了数量性状位点(quantitative trait locus，QTL)的检测及效应分析，初步分析了持绿性、充实度和产量等农艺性状的遗传基础和各性状间的相关关系。

H higher than those for shanyou 63 respectively, the calcium contents in extracts, the Mg(superscript 2+)-ATPase activities on the chloroplast membranes, the cyclic photophosphorylation activities of the flag leaf sheathes and blades for Liangyoupeijiu were also higher than those for Shanyou 63; the means of noncyclic photophosphorylation activities of the flag leaf sheathes and blades for Liangyoupeijiu were 0.25 and 0.31 μmol/ higher than those for Shanyou 63, respectively; the photochemical avtivities of the flag leaf sheathes and blades for Liangyoupeijiu were significantly higher than those of its parents at most stages, showing heterosis over mid-parent or heterobeltiosis.

h，且大多数时期达显著或极显著水平；两优培九剑叶叶鞘及其叶片浸出液钙含量均显著或极显著高于汕优63；两优培九剑叶叶鞘及其叶片叶绿体膜上Mg(上标 2+)-ATPase活性的均值均高于汕优63，大多数时期达显著或极显著水平；两优培九剑叶叶鞘及其叶片循环光合磷酸化活性的均值也均高于汕优63，近一半时期达显著或极显著水平；非循环光合磷酸化活性的均值分别比汕优63高0.25和0.31μmol/mg？

The new plant type Indica and Japonica varieties showed somewhat check heterosis whencrossed with one of the four sterile lines. America Japonica varieties showed few fillers andlower seed set ratio and Africa Japonica varieties, Nuda varieties, Javanica varieties have fewtillers and taller plant height, so they could not be used directly in Japonica hybrid ricebreeding program.

美国稻的分蘖少且结实率较低，产量优势不大；非洲稻的分蘖少，实粒数也少，株高太高，无法直接利用；新株型粳稻与培矮64s、N422s配组有一定的优势，新株型籼稻与N422s、108s配组的优势也较大，在华北两系杂交粳稻育种中也有一定的利用价值；光壳稻和爪哇稻的株高偏高，无法直接利用，可间接利用这两个生态型千粒重大的特点。

In this paper, Platycodon grandiflorum was studied to explore the method and technology of using heterosis in sexual reproduction medicinal plant, which is to la.

本论文以我国重要中药材桔梗为对象，探索有性繁殖药用植物杂种优势利用需要解决的关键基础问题，为培育药材专用或药食兼用的优良桔梗杂交品种奠定基础。

In laboratory,"Pearl oyster breeding scheme, POBs" assumes populations of Indian and Sanya as the basic groups to nurture specialized lines, and then constructs cross lines by making use of heterosis and eventually bring out new varieties of P.martensii.

在我们实验室的&珍珠贝育种规划(Pearl oyster breeding scheme， POBs)&，就是以印度种群和三亚种群作为基础群，分别培育专门化品系，利用杂种优势，构建杂交配套系，最终育成马氏珠母贝新品种。

Researchers took the lead in making studies on onion and pepper male sterile line utilization, heterosis utilization and resistance breeding in solanaceous and cruciferous vegetables, watermelon and melon.

并在国内率先开展了洋葱、辣椒不育系利用，茄果类、十字花科蔬菜及西甜瓜杂种优势利用及抗病育种研究，1982年至今育成并通过审定的蔬菜新品种75个。

The maize had the effect of heterosis xenian.

玉米的油份有花粉直感效应的作用。

Howoever, these functions of male parent are better than those of female parent and their hybrid rice in non-heterosis hybrid combination.

然而，在无优组合中，上述的光合功能却是父本高于母本和它们的子一代。

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％。