超显性

除播种至抽穗天数外，其它性状都表现超显性现象。

Except for the days from sowing to heading , the other traits showed superdominance .

叶角、叶向值以低值为部分显性，叶长、叶面积以高值为超显性。

Low values of leaf angle and LOV were partially dominant and high values of leaf length and width had superdominance .

蛋白质和赖氨酸含量的平均显性度（（H1/D）~（1/2））均为超显性。

The mean degrees of dominance ( H_1 / d ) ~ ( 1 / 2 ) of protein and lysine content were overdominance .

对这些QTL的效应进行分析发现65%（15／23）的QTL表现为超显性效应。

Sixty five percent ( 15 / 23 ) of these QTLs showed obvious overdominance .

但单株麻骨重及出麻率主要受控于σD~2，hN~2低，分别为17.56%和5.22%，超显性。

But stick weight and crude fiber percentage are mainly governed by nonadditive gene effects . These two traits showed low hN2 of 17 . 56 % and 5 . 22 % , and overdominance .

第1、2染色体上的QTL表现为超显性效应，第3染色体上的QTL表现为加性效应。

Two of them located on chromosomes 1 and 2 displayed over-dominant effects , and the other QTL mapped on chromosome 3 was additive .

对每个QTL（定量特征点位分析），均检测到加性和显性效应，但相对大小有不同，各QTL以部分显性、显性和超显性为主要遗传方式；

For each QTL , both additive effect and dominant effect were detected . Most QTLs had the genetic effect of partial dominance , dominance or overdominance .

比较分析发现，两地一致在第2、3染色体上各检测到1个QTL，其中第2染色体上的表现为超显性效应，第3染色体上的表现为加性效应。

The QTL with high LR values could be consistently identified on chromosomes 2 and 3 over two environments , displaying over-dominant and additive effects , respectively .

此外穗发芽性的遗传还存在超显性现象。

The genetics of grain sprouting had the phenomena of super-dominance .

应用分子标记研究已经为经典的显性和超显性假说找到新的证据。

The dominance hypothesis and over-dominance hypothesis have been found some new evidence .

数量性状超显性基因作用的研究

Research on effect of overdominant genes of quantitative traits

穗长为超显性，显性基因效应比加性基因效应更重要。

Dominance gene effect of spike length was higher than that of additive .

高含油率对低含油率的基因作用性质为超显性。

The nature of gene action of high oil content was superdominant to low oil content .

部分显性和超显性对穗粒性状的遗传起主要作用。

Partially dominance and over dominance played the most part role in the genetics of ear-kernel traits . 3 .

对于纤维品质性状，则显性效应大于加性效应，部分性状甚至表现为超显性。

As for most fiber quality characters , dominant genetic effect is more important and less important with the additive effect .

很多经典理论&包括显性假说、超显性假说和上位性假说都部分解释了这一现象的形成机理。

Some hypotheses , including dominance complementation hypothesis , overdominance hypothesis and epistasis hypothesis , have partially explained the cause of formation .

蛋白质含量、油分含量、蛋白质指数和油分指数的遗传效应均以显性效应为主，属超显性性状。

High protein content and low oil content of kernel was inherited as a super-dominant trait governed by one or more blocks of genes .

遗传振动合成学说是一个动态遗传理论，显性学说和超显性学说只是它的一个特例。

This theory is a dynastic one , and dominance theory and overdominance theory are only the special cases of resultant genetic vibration theory .

结果表明：含油量的遗传符合加性&显性遗传模型，有关基因在亲本中呈独立分布；显性指向增效，表现超显性作用；

The results indicated that inheritance behavior of oil content fitted an additive-dominant model , the relevant genes showed independent distribution in parents ' .

控制蛋白质含量和沉淀值的基因作用方式为超显性，显性作用大于加性作用。

The expression of genes controlling protein content and sedimentation value were overdominance and the effects of dominance were much greater than the additive one .

遗传效应中存在加性效应和显性效应，但以显性效应为主，且可能存在超显性。

There were additive effect and dominant effect in genetic effects . However , the dominant effect played a major role and overdominance may exist in salinity tolerance exhibition .

对α-淀粉酶活性按配合的二参数、四参数和五参数模型χ2测验，认为α-淀粉酶活性符合加性-显性遗传模型，基因上位作用不明显，并存在超显性遗传现象。

Test result by two parameter 、 four parameter and five parameter models showed that the activity of α - amylase fit the additive-dominant genetic model , the epistatic-action was not obvious and super-dominant genetic phenomenon was existed . 3 .