查询词典 cross breeding

Determination of combining ability was one effective way to select excellent parents and make excellent cross combinations in breeding of Antheraea pernyi.

配合力测定是柞蚕育种中选择优良亲本和组配优良杂交组合行之有效的方法之一。

To prevent cross-contamination of the virus from different animals, the feed eaten by the breeding hens cannot contain animal products; they cannot test positive for Salmonella enteritidis, Salmonella pullorum or Salmonella typhi, nor for avian flu or avian leukosis viruses; and they must also be free of external hormones and antibiotics.

魏逸之称呼这些是「clean eggs」──为了避免不同动物体内的病毒交互感染，种鸡所吃的饲料不得含有动物成分；它们体内不得检出肠炎沙门氏杆菌、鸡白痢沙门氏杆菌、伤寒沙门氏杆菌，以及A型禽流感、禽白血病等病毒，也不得有贺尔蒙与抗生素的残留。

High molecular weight glutenin subunits 14+15 and 5+10 with good quality properties were introduced into the parents of high-yielding hybrid wheat XZ1 through biochemical marker assisted selection and greenhouse backcrosses breeding,and then gained hybrid wheat with 5+10,14+15,and pyramided 5+10 and 14+15 though cross-fertilize between parents with good HMW-GS.

随着社会的发展、人们生活水平的提高和消费意识的改变，品质育种已成为当今小麦育种的主攻目标之一。我国在十五&期间，提出了超级小麦育种&计划，力求产量、品质与环境的协调提高。杂种优势是生物界普遍存在的一种现象，是大幅度提高作物产量和品质的有效途径[1]。

The other approach is to be elected monoclonal were threshing, planting, respectively, and lines of future generations to choose, compare, until the election of new varieties, said the plant selection, commonly used in self-pollinating crops or often cross-pollinated crop breeding.

另一做法是将当选单株分别脱粒，分别种植，然后对后代株系进行选择、比较，直至选出新品种，称单株选择，常用于自花授粉作物或常异花授粉作物育种。

Some important issues, such as the identification of synonyms and homonyms, the classification of germplasm resources, the breeding with sexual cross and early selection, the discovery and evaluation of mutants, and even the localization and cloning of important genes are all important research subjects to be addressed.

例如，荔枝品种中同物异名与同名异物情况的区分、种质资源的鉴别与合理的分类、杂交育种与早期选择、突变的发掘与鉴定评价、甚至重要性状基因的定位与克隆等，都是很需要解决的研究问题。

Breeding of transgenic rice restorer line for multiple resistance against bacterial blight, striped stem borer and herbicide(1) Transgenic rice line Zhongguo91 (carrying cry1Ab and bar gene) and elite restorer line Hui773 were crossed, then backcross was carried out three times using Hui773 as recurrent parent and self-cross was carried out one time.

多抗性(抗白叶枯、螟虫、除草剂)转基因水稻恢复系的培育(1)将恢773与携有转cry1Ab和bar基因的水稻新品系中国91(cry1Ab)杂交，并以恢773作为轮回亲本，连续回交三代和自交一代，对各回交世代的单株进行cry1Ab和bar基因的PCR分析、田间抗虫性鉴定和除草剂Basta抗性鉴定，经过选择获得了转基因水稻恢复系T773-1，田间种植对螟虫及除草剂Basta表现很好的抗性。

In order to study the genetic laws of alkaline water retention capacity in wheat, which might be beneficial for high quality wheat breeding, genetic analysis was conducted in six parents and their F1 obtained from a diallel cross without reciprocals. Six parents characterized with different quality triats in kernel hardness, protein content, gluten strength and AWRC.

为给优质小麦选育提供参考依据，以籽粒硬度、蛋白质含量、面筋强度和碱水保持力不同的6个常用优质小麦品种为亲本，按Griffing双列杂交法Ⅱ配制15个杂交组合，研究了小麦碱水保持力的遗传规律。

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％。