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quantitative genetic character
相关语句
  数量遗传性状
     Genetic factors also affect this ratio with a heritability factor of 0.2~0.5. Seed dimorphism is a quantitative genetic character and is under the control of more than two genes (locus).
     遗传因素也影响二形性种子的比例,其遗传率一般在0.2~0.5之间,是一种数量遗传性状,受多个基因控制。
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  “quantitative genetic character”译为未确定词的双语例句
     STUDY ON BLOOD PROTEIN POLYMORPHISM AND QUANTITATIVE GENETIC CHARACTER OF BIN-HU BUFFALOES
     滨湖水牛血液蛋白多态性与数量遗传特性研究
短句来源
  相似匹配句对
     The genetic
     用等电聚焦免疫固定技术调查成都地区汉族群体Bf的遗传多态性。
短句来源
     GENETIC DISTANCE OF QUANTITATIVE CHARACTERS AND ITS ESTIMATION
     作物数量性状的遗传距离及其测定
短句来源
     Quantitative Genetic Analysis of Allelopathy in Rice
     水稻化感作用的数量遗传分析
短句来源
     GENETIC STUDIES ON QUANTITATIVE CHARACTERS OF WATERMELON
     西瓜数量性状的遗传研究
短句来源
     QUANTITATIVE GENETIC ANALYSIS ON COMPLEX CHARACTERS
     作物综合性状的数量遗传分析
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Photosynthetic genetics is study on genetic control of photosynthesis. The following results are presented from the experiments on crops done in many years. Heredity of net photosynthetic rate (pn) in rice, a quantitative character, is controled by polyenes, including and the nuclear genes play and important role. There are at least 10 pairs of genes controlling pn. Heritability of on in rice varietes with vary combinations of genes. Broad sense (h_B~2) and narrow sense heritability (h_n~2)...

Photosynthetic genetics is study on genetic control of photosynthesis. The following results are presented from the experiments on crops done in many years. Heredity of net photosynthetic rate (pn) in rice, a quantitative character, is controled by polyenes, including and the nuclear genes play and important role. There are at least 10 pairs of genes controlling pn. Heritability of on in rice varietes with vary combinations of genes. Broad sense (h_B~2) and narrow sense heritability (h_n~2) are 34.85-66.50% and 24.4-34.0%, respectively. When selection coefficient reaches 5% level, the genetic advance expected of pn in a population is 1.62-3.61 mg co_2dm~(-2)h~(-1). Chlorophyll (chl) content and a : b ratio are both stable quantitative genetic characters, show heterosis and are controled by polygenes. Heredity of chl, is controled mainly by nuclear genome; the chloroplast genome, though it shows inheritable effect, is not fully acting on it's own. The h_B~2 of chl. Content and a : b ratio are 38.77-81.39 % and 46.42-77.27%, respectively. Heredity of photorespiration rate (Pr) in rice, a quantitative character, is controled by polyenes. The heritability of photorespiration rate (Pr) is bigger than the heritability of net photosynthetic rate (pn). In breeding for high photosynthetic efficiency, should be used direct photosynthetic characters and indirect photosybthetic characters.

光合作用的遗传学是研究光合作用的遗传控制和光合作用的遗传与变异的规律。水稻Pn的遗传主要受核基因组成所控制,质基因组虽有作用但未表现出完全的细胞质遗传现象,属数量遗传性状,控制水稻Pn的基因数目在10对以上,其广义遗传力为34.85~66.50%,狭义遗传力为24.4~34.0%。水稻叶绿素含量亦属数量遗传性状,受多基因控制,叶绿素含量的广义遗传力为33.87~81.34%,a/b比值的广义遗传力为46.72~77.27%。光呼吸速率(Pr)亦为多基因控制的数量性状,其遗传力和遗传进度皆大于Pn。在作物育种中可以直接利用光合性状选育高光效品种,也可以间接利用与光合特性相关的性状进行初选。

Abstract The status quo of quantitative genetic characters of trees is presented. The author holds that the research on quantitative genetics is of important significance for the practice of tree breeding. With the development of biology and the combinations between theory and technology of molecular genetics and between biotechnology and quantitative genetics, the development of quantitative genetics is promoted. The further research on quantitative genetics is necessary.

本文通过对林木数量性状遗传研究的回顾和发展现状的分析,展示了其可能的发展趋势,并提出了研究重点。

Seed dimorphism (polymorphism) can be defined as the production of two (or more than two) different types of seeds by a single individual. The seeds may be different in morphological and/or physiological aspects. Seed dimorphism or polymorphism is found in many plant species of Asteraceae, Poaceae, Brassicaceae and Chenopodiaceae. Dimorphic seeds typically differ in the presence/absence of dispersal structures (e.g., pappus, trichomes). In members of Asteraceae, peripheral achenes are persistent, large, dormant...

Seed dimorphism (polymorphism) can be defined as the production of two (or more than two) different types of seeds by a single individual. The seeds may be different in morphological and/or physiological aspects. Seed dimorphism or polymorphism is found in many plant species of Asteraceae, Poaceae, Brassicaceae and Chenopodiaceae. Dimorphic seeds typically differ in the presence/absence of dispersal structures (e.g., pappus, trichomes). In members of Asteraceae, peripheral achenes are persistent, large, dormant and sensitive to light, temperature, water and salt; while central archenes are dispersible, small and non-dormant. Dormant seeds or the seeds which are sensitive to environmental factors are an essential part of a seed bank. Seedlings from dimorphic seeds differ at the early stage (40 days old for Hedypnois cretica), but the difference decreases quickly for H. cretica(no difference at 70 days old), while the difference persists during the life cycle for Atriplex Sagittata. Both kinds seedlings produce dimorphic seeds in next generation. Environmental factors such as water, salt, nutrient and density stress affect the ratio of dimorphic seeds. Genetic factors also affect this ratio with a heritability factor of 0.2~0.5. Seed dimorphism is a quantitative genetic character and is under the control of more than two genes (locus). In order to explain the causes of seed dimorphism, two models are proposed based ecological and ontogenetic constraints: bet-hedging (high risk/low risk) strategy and ontogenetic model. Dimorphic seeds from different individuals of the same species differ considerably in their structure, germination/dormancy characters, responses to environmental stresses, early seedling growth and genetic aspects. Generally, seed dimorphism (polymorphism) is a consequence of long-term (evolutionary) interactions between environmental and genetic factors - an ecological adaptation to variable environment. The underlying mechanisms of seed dimorphism are very complex and unclear. Four guidelines are proposed for future studies: biotechnology procedures to identify genetic mechanisms of seed dimorphism, molecular biology techniques to identify phytohormone differences in dimorphic seeds, the current ecophysiological studies to understand the relative importance of various environmental factors and life cycle research.

植物种子的二形性(多形性)是指在同一棵植株上生长有形态结构、生理、生态学特性等方面有很大差异的两种(多种)种子。这种现象在自然界中比较普遍,特别是菊科、藜科、禾本科、十字花科中最为常见。二形性种子可分为有扩散结构和没有扩散结构(如冠毛和表皮毛状体)两种。如菊科的边花种子一般不具有扩散结构、个体较大,具有休眠特性和对光、温度、水、盐分等环境因子的敏感特性;而中间花种子一般具有扩散结构,个体较小,不具有休眠特性。具有休眠特性和对环境因子比较敏感的种子是形成土壤种子库的主要成分。二形性种子产生的幼苗在前期形态大小上都有差异,但生长后期有些差异不显著(70daysoldforHedypnoiscretica),有些仍很显著(AtriplexSagittata)。这二形性幼苗所产生的后代同样也具有二形性现象。二形性种子产生的比例受环境因素的影响,例如:水、盐、养分和密度胁迫等。遗传因素也影响二形性种子的比例,其遗传率一般在0.2~0.5之间,是一种数量遗传性状,受多个基因控制。为了解释二形性种子产生的原因,从生态学和个体发育的角度提出了两个模型:生态进化模型(两面下注策略或高低风险策略)和个体发育模型。不同植物的二形性...

植物种子的二形性(多形性)是指在同一棵植株上生长有形态结构、生理、生态学特性等方面有很大差异的两种(多种)种子。这种现象在自然界中比较普遍,特别是菊科、藜科、禾本科、十字花科中最为常见。二形性种子可分为有扩散结构和没有扩散结构(如冠毛和表皮毛状体)两种。如菊科的边花种子一般不具有扩散结构、个体较大,具有休眠特性和对光、温度、水、盐分等环境因子的敏感特性;而中间花种子一般具有扩散结构,个体较小,不具有休眠特性。具有休眠特性和对环境因子比较敏感的种子是形成土壤种子库的主要成分。二形性种子产生的幼苗在前期形态大小上都有差异,但生长后期有些差异不显著(70daysoldforHedypnoiscretica),有些仍很显著(AtriplexSagittata)。这二形性幼苗所产生的后代同样也具有二形性现象。二形性种子产生的比例受环境因素的影响,例如:水、盐、养分和密度胁迫等。遗传因素也影响二形性种子的比例,其遗传率一般在0.2~0.5之间,是一种数量遗传性状,受多个基因控制。为了解释二形性种子产生的原因,从生态学和个体发育的角度提出了两个模型:生态进化模型(两面下注策略或高低风险策略)和个体发育模型。不同植物的二形性(多形性)种子在结构、发芽休眠特性、对环境因子的反应、幼苗特性、两者的比例受遗传和环境因素的影响不尽相同。种子二形性(多形性)是植物本身的遗传特性和环境因素共同作用产生的现象,是植物适应环境的一种生理、生态机制,是植物长期进化的结果。总之,二形性种子的形成机理非常复杂,目前还不是很清楚。对以下4个方面的研究进行了展望:采用生物技术的手段研究种子二形性的遗传机制;二形性种子激素等化学物质含量的差异;目前各种环境因素对植物生长的生理生态学意义;二形性植物生活史的系统研究。

 
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