breeding cycle

After root reduction , the cluster bud can be grow into complete plant , the breeding cycle were shortened greatly .

丛生芽经过生根诱导后就可以形成完整植株，从而极大的缩短了繁殖周期。

The breeding cycle of Oncorhynchus mykiss was one year and the spawning type was single spawning .

虹鳟繁殖周期为一年，产卵类型为一次性产卵。

Techniques of apple genetic transformation can improve apple trees and shorten the breeding cycle by molecular methods .

苹果的遗传转化技术通过分子手段改良苹果，有助于缩短其育种周期。

Shortening breeding cycle depends on how to overcome the long time span before first flowering and on early selection and test .

决定缩短育种轮回的因素是如何克服林木始花龄晚和能否有效进行早期测验和选择。

Natural variation is one of the traditional reproduce methods , not only its breeding cycle is too long , but also produces little effect .

采用传统的自然变异繁殖方法育种周期长，效果又不明显。

During the course of this varietal improvement , the techniques for shortening breeding cycle were adopted in developing new rice varieties .

在品种改良过程中，用缩短培育周期的技术培育新稻种。

Gene engineering has provided an effective approach for crop variety hereditary improvement because it could shorten the breeding cycle and increase the breeding efficiency .

基因工程为作物品种遗传改良提供了一个高效的技术手段，可以大大缩短育种周期和提高育种效率。

In the pigeon reproduction performance the artificial feeding group shorten the breeding cycle of 21-day than nature nurture group . the difference is significant .

种鸽繁殖性能上，人工哺育组繁殖周期比自然哺育组缩短21天，其差异极显著（P0.01）。

With a breeding cycle at about 170 days , he will soon be sending fattened pigs off to a market that is still offering near-record prices .

猪的养殖周期约为170天，所以他将能够很快地把养肥的猪送往市场，目前的猪肉价格则仍接近历史最高水平。

If a reliable method of this nature is developed , the breeding cycle can be shortened , land and labour saved and promising clones earlier recommended for large scale planting .

如果这个方法在苗期阶段解决，将能缩短育种周期，节省土地和劳力，使有希望的无性系较早地推荐于生产。

Behavior Time Budget and Activity Rhythm of Saunders 's Gull ( Larus saundersi ) During Different Period of Breeding Cycle at Yancheng of Jiangsu , China

江苏盐城黑嘴鸥繁殖期不同阶段行为时间分配及活动规律

Homozygous diploid can be directly obtained by haploid , that can speed up the homozygosis of genotypes and greatly enhance the selection efficiency , and shorten the breeding cycle .

采用单倍体育种只经一代就可获得纯合的二倍体，从而可以加快育种材料基因型的纯合，大大提高选择效率，缩短育种年限。

" Because American redstarts return to the same site to breed each year , arriving later may make it harder for them remain to remain in synch with their breeding cycle ," Studds said .

“因为美洲红尾鸲每年都返回同一地区繁殖后代，所以返回时间推迟会使它们的到达时期与繁殖时期很难保持一致。”Studds说。

To sum up , the Ml breeds from ion implantation appear heritable variation frequently , and the selected plants separate rarely at M2 and stabilize at M3 , so that the breeding cycle has been shortened , the breeding efficiency has been enhanced .

总体上讲，离子注入当代频繁出现可遗传变异，且M2代分离小，M3代趋于稳定，从而缩短了育种周期，大大提高了育种效率。

The results indi - cated the techniques of anther culture on the hybrid between wild and cultivated rice is one of the most effective way to overcome the unsteady of the hybrid progenies , long breeding cycle and to quicken the utilization of wild rice resources .

研究表明野栽杂交花培育种技术是克服野栽杂交后代稳定难，育种周期长与加速野生稻资源利用的有效途径。

Tissue culture and transgenic research shortened the breeding program cycle , thus provided a promising way to obtain elite citrus germplasm that are cold tolerant .

柑橘组织培养以及建立在此基础上的遗传转化为缩短育种周期、获得抗寒、优质柑橘种质资源提供了新的途径。

Traditional breeding methods cycle is longer and less efficient , and through modern DNA molecular markers to assist breeding has become a faster , more accurate way of breeding .

传统的育种方法周期较长，效率较低，而通过分子标记技术来辅助育种是一种较为快速、准确的育种途径。

Application of Protoplast Technique in the Rejuvenation 、 Breeding and Life Cycle of Poria Cocos

原生质体技术在茯苓菌种复壮、育种和生活史研究中的应用

Traditional breeding methods have long cycle and heavy workload , and can not meet the present production needs .

传统的常规育种方法育种周期长且工作量大，不能满足目前生产需要。

New soybean varieties with disease resistance , high yield , good quality are extremely urgent . Conventional breeding due to long breeding cycle , lack of quality resources , and gene linkage and exchange among geges , made a slow progress in the breeding of improved varieties .

培育抗病、高产、优质的大豆新品种迫在眉睫。常规育种选育周期长、优质资源匮乏，而且基因之间存在连锁和交换现象，使得优良品种的培育进展缓慢。

However , these breeding technologies have differently some serious weaknesses such as breeding cycle period being too long and heredity of good characters being unstable .

然而，这些育种技术均存在育种周期长、优良性状遗传不稳定等不足之处。

Breeding of soybean varieties by traditional methods has some disadvantages , such as long breeding cycle and low selection efficiency .

传统常规育种具有选择效率低、育种周期长等缺点。

We can improve multiple traits of rice such as resistance to pests and protein quality at the same time by conventional breeding approaches or sexual crossing between transgenic plants , but they both cause long breeding cycle and low efficient .

利用传统育种手段或通过将含有不同外源基因的转基因植株进行有性杂交皆可同时改良水稻的抗虫特性、蛋白质品质等农艺性状，但两种方法的缺点都是育种周期长，见效慢。

The hatching period almost lasted 30 days , and breeding period 43-45 days in nest and 50 days outsides or so . The breeding cycle is 150 days at least from choosing nest site to young independence .

孵化期将近30天，巢内育雏期43～45天，巢外育幼期50天左右，繁殖周期从巢址选择到幼鸟独立生活至少150天。