查询词典 cross breeding

To promote the development and application of multicolor silk, the morphological structure of the nature yellow silkworm silk from a silkworm variety, selected by cross breeding method, was investigated by SEM and compared with the normal white silkworm silk, the golden wild silkworm silk from Cambodia, and the Antheraea pernyi silk, respectively.

为了进一步促进彩色蚕丝的开发和应用，研究了通过杂交育种获得的天然黄色家蚕茧丝的外观形态和截面结构特征，并与普通白色家蚕丝、柞蚕丝和来自柬埔寨的多化性黄茧家蚕丝进行了比较研究。

In order to clarify the rules of POD isoenzyme in the hazelnut, identify their blood relations between female, male and filial generations and select the superior parents for cross-breeding, we have studied the characteristics of peroxidase isoenzyme which are distributed in the 34 hazelnut varieties or lines by polyarclamide gel electrophoresis, The results showed that:POD isoenzymes of Corylus heterophylla Fisch, Corylus avellana L, and the hybrid of Corylus heterophylla Fisch × Corylus avellana L had obvious difference; some hybrids had lost P10 spectrum band of parents; the enzyme spectrum of 32 hybrid hazelnuts produced 'new hybrid spectrum bands'that could be considered as a mean to identify hybrids.

为了阐明过氧化物同工酶在榛品种中的分布规律，探讨平榛、欧榛及其杂种榛之间的亲缘关系，选育优势杂交亲本，本试验采用聚丙烯酰胺凝胶垂直电泳，研究了34个榛品种成熟叶过氧化物酶同工酶酶谱特征，结果表明：平榛、欧榛及其平欧杂种榛品种间酶谱具有较大差异；有的杂种品种遗失了父母本共有谱带P10；32个平欧杂种榛品种出现了双亲所不具有的新酶带，可作为鉴别杂种的一条途径。

The alternative,"feather sexing," is a form of cross-breeding that leaves females with detectably longer pin feathers than those of their male counterparts.

但是这种方法在性别选育中并不是最常用的方法。另一种方法&羽毛性别选育法&，这是杂交繁育的一种形式。

The cross breeding produced increased height at the wither, a jowly look to the head, and an unbalanced nervous system.

混合血统的后果产出了更大的身高和肩高，下颌部悬吊的褶皱状垂肉，以及不寻常的敏感的神经系统。

Additionally, heterosis from cross breeding was analyzed and discussed. The major results and conclusions are presented as follows:1 Variances of shell shape and phenotypic traits among different stocks or populations of Meretrix clam1.1 The shell shapes of seven natural stocks(L、S、J、Z、F、G、W)and one cultured stocksshowed certain differences as well as similarities.

主要结果和结论如下：1文蛤不同群体的形态和性状的变异规律1.1文蛤不同群体的形态变异特征利用多变量形态度量学方法，对文蛤的辽宁、山东、江苏、浙江、福建、广西、白壳等7个自然群体和1个浙江养殖群体的形态变异进行研究。

In this experiment, the parent strains of Pleurotus ostreatus were 9400 and 803 .143 new crossing progenies strains were abtained by monospore cross breeding, and those strains were used to attain Pleurotus ostreatus strains with properties of good quality by a series of selecting experiments.

本试验以平菇9400和平菇803为亲本，通过单孢配对杂交，获得143个杂交子代菌株，并对其进行一系列的筛选试验，旨在获得平菇优良新菌株。

ABSTRACT It is because that the excellent acceptors for maize transgenic engineering are insufficient in our country, especially in the southwest mountain areas of china and hereditary variation regularity for the two characters such as efficiency of embryonic callus induction and number of regenerating plant (these two characters were abbreviated to the nduction efficiency and number of regenerating in the following of the paper, respectively), which hint the maize culturing capacity, is not very clear. Therefore, aiming at picking out superior acceptors, we had made systematic researches on the two characters with combing traditional quantitative-character genetic analyzing methods such as single-factor genetic mating design, diallel crossing genetic design, genetic effect analyzing method and the modern molecular locating method such as QTLs'. The main results are followed.(1) 50 superior inbred lines and about 30 crosses in our country, especially in the southwest of China were used for identifying and selecting the superior genotypes in the above two investigated characters under the same culturing condition in 2000 and 2001. There was very significant difference among the genotypes in the both characters. But the two characters were not certainly related. Some genotypes such as 18-599 and 18-599 were very good in them. For some ones such as zong 31, induction was higher than 18-599 and 18-599 in the efficiency, but it was only 1/3 to the later in regenerating number. In some genotypes such as S37, R08, R15, P138, A318, induction efficiency was just about 3% and scarcely any regenerating plants were got. On the whole, hybrids acted better than inbreeds in the both characters.(2) Two kind of inbreeds were selected as parents of the Griffing's method 1. 18-599 and 18-599 and the inbred line zong 31 are one kind because they are not only superior in the characters of maize cross breeding, such as CA, resistance to disease and the important agricultural characters, but also excellent in transformation characters as the induction and regeneration.

针对我国、特别是西南山地所需玉米转基因工程育种优良受体极为匮乏和反应玉米幼胚培养能力的2个主要性状，即玉米幼胚胚性愈伤组织诱导率和胚性愈伤组织绿苗发生数的遗传变异规律十分不清楚的实际情况，本研究从筛选玉米转基因工程所需要的优良受体入手，采用单因素遗传交配设计、双列杂交遗传交配设计、世代基因效应等传统数量性状分析方法，以及现代分子标记定位主效QTL分析方法，对玉米幼胚胚性愈伤组织诱导率和胚性愈伤组织绿苗发生数等2个性状进行了较为系统的分析研究，取得以下主要研究结果：(1)于2000年和2001年通过对我国、特别是西南地区近50份优良自交系和近30个杂交组合，在相同培养条件下，对幼胚培养胚性愈伤组织诱导率和胚性愈伤组织绿苗发生数等2个幼胚培养能力性状进行了筛选与鉴定，发现玉米不同基因型具有完全不同的幼胚培养胚性愈伤组织诱导率和胚性愈伤组织绿苗发生数，但幼胚培养胚性愈伤组织诱导率与胚性愈伤组织绿苗发生数并不具有必然的相关关系，有的基因型，如自交系18-599和18-599在胚性愈伤组织诱导率和愈伤组织绿苗发生数等2个性状都表现相当优异；有的基因型，如自交系综31，仅幼胚培养胚性愈伤组织诱导率性状表现高于19-599和18-599，但在胚性愈伤组织绿苗发生数这一性状则与它们有相当大的差距，仅为19-599和18-599的1/3左右；有的基因型，如S37、R08、R15、P138、A318等玉米自交系不仅幼胚培养胚性愈伤组织诱导率很低，平均仅在3％左右，而且胚性愈伤组织绿苗发生数表现也很差，基本上没有分化成苗。

The research progress on Dispyros kaki identification in morphological markers, cytological markers, biochemical markers and molecular markers and the new germplasm creation in cross-breeding, selection of bud mutation were summarised.

从形态学标记、细胞学标记、生化标记和DNA标记4个方面对柿品种的鉴定进行了阐述及评价；从有性杂交育种、芽变选种种质创新方面阐述了柿育种。

The traditional line selection and cross breeding is one of the most effective ways to cultivate improved varieties.

传统的家系选择和杂交育种是培育优良品种最有效的方法之一。

For that, thank the cross-breeding of Marconi's radio and the microprocessor.

这，得益于对微处理机和马可尼的无线广播进行的整合改造。

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％。