In order to transfer successfully the useful traits from ryegrass to wheat, it is necessary that offspring was produced by continuous backcross.

為了使黑麥草的優(yōu)良性狀能最終轉(zhuǎn)移到小麥中免费涩涩在线视频网，需要用小麥不斷地回交以獲得回交后代。

The decomposition of chromosome was a main problem in construction of BAC library. DNA discompose would be avoided or decreased by adjustments of component and pH of chromosome extraction buffer or pre-electrophoresis for 6-8h before digestion. Identification of inter-species hybrids was a necessary step for creating a new germplasm. Two samples were selected from offspring of hybridization and backcross of a cross between cabbage and Chinese cabbage.

鑒定種間雜種是利用遠緣雜交創(chuàng)造新種質(zhì)時的一項重要工作日韩一区在线观看，本研究運用細胞核DNA含量流式測定技術(shù)久99久人碰人，對甘藍和白菜雜交及回交各世代的DNA含量進行檢測，以監(jiān)控遺傳物質(zhì)在不同材料間的流向这里精品视频，并從回交二代植株群體中篩選了兩個材料，具有和白菜差異不顯著的DNA含量人人草人人爽，可推斷其為核質(zhì)雜種自拍日韩在线观看视频网站免费。

The study suggest:(1) The observation of satellites in root tip and multiplex PCR makers could accurately identify the homozygous and the heterozygosis of 1BL/1RS translocation.(2) Through the restoring degree we could confirm the success of the transfer. The combination of the restoring degree and the agronomy property could increase the efficiency of practical application.(3) This study proposed the transformation from the physiological male sterile to the genetic male sterile, and then establish a method of utilize the strong superiority crosses.

其中復(fù)合引物PCR更適合于回交后代中大量目標(biāo)種子的篩選；(2)恢復(fù)基因轉(zhuǎn)育后代定株與不育系測交，依據(jù)測交恢復(fù)度可準(zhǔn)確確定恢復(fù)基因在回交后代的延續(xù)无码特级毛片A片，恢復(fù)基因定株定向轉(zhuǎn)育與性狀選擇結(jié)合可大大提高轉(zhuǎn)育后代的實際應(yīng)用效果美女黄片视频大全；(3)本研究提出的粘類小麥雄性不育恢復(fù)基因Rfv1定向轉(zhuǎn)育體系，可有效地實現(xiàn)小麥由化控強優(yōu)勢組合向三系強優(yōu)勢組合的定向轉(zhuǎn)化日韩无码三级片免费观看，即生理型不育途徑向遺傳型不育途徑的定向轉(zhuǎn)化毛片网站在线免费播放，進而建拓一套雜交小麥強優(yōu)勢組合多途徑利用新體系。

Juncen. The seed setting by backcross were even lower, only 0.35 and 0.33 per silique respectively, when using F1 with glufosinate-resistant gene and glyphosate-resistant gene as maternal plants and wild B. juncea as parental plant.

分別以兩種F1為母本黄色网站在线看免费。，野芥菜為父本進行回交国产东北老妓女视频在线播放，結(jié)實仍然很低，攜帶抗草丁膦基因的F1和攜帶抗草甘膦基因的F1與野芥菜回交每個角果飽滿種子粒數(shù)分別只有0.35和0.33自拍视频最新日韩欧美。

We also detected genomic changes which were possibly associated with the reduced fitness in backcross by amplified fragment length polymorphism. The changes mainly involved loss of parental AFLP bands (backcross1, F1 hybrid female×olive flounder male, 3.96%; backcross2, F1 hybrid female×summer flounder male, 6.03%) and gaining of novel bands (backcross1, 5.63%; backcross2, 3.28%).

同時91亚洲精品自在在线观看不卡的，利用AFLP對回交子代基因組的變化進行了分析，發(fā)現(xiàn)回交中不僅存在親本位點的丟失(褐牙鲆回交子代-回交1欧洲色国产欧美一区二区精品97， 3.96%国内JIZZ；夏牙鲆回交子代-回交2， 6.03%)的現(xiàn)象在线观看污色视频，也存在非親位點(回交1亚洲精品福利视频， 5.63%；回交2西安一级毛片， 3.28%)的現(xiàn)象日韩视频一区二区。

Two parents,Balillaand Nantehao,which were significantly different on GT-ASV,were selected to construct a backcross population Balilla/Nantehao//Balilla containing 142 individuals.

選擇在ASV-GT上具有顯著差別的秈稻品種南特號和粳稻品種Balilla雜交，并以Balilla回交得到含有142株的回交群體黄色视频在线任意观看。

Six plants of BC2F1 pyramiding Xa23 and IPT genes were further obtained in the combinations of "[(9311/// He'xi 15/CBB23//GC-1) 9311] 9311","[(E32/// He'xi 15/CBB23//GC-1) E32] E32". After backcrossed and self-crossed 1~2nd, the plants pyramiding Xa23 and IPT genes can be used in program of hybrid rice breeding.

攜帶IPT基因的抗病植株再與雜交稻親本進行回交在线看片免费观看视频网址，在2個BC2回交組合&[（9311///合系15/CBB23//GC-1） 9311] 9311&和&[（E32///合系15/CBB23//GC-1） E32] E32&中獲得了7株攜帶IPT基因與Xa23基因的植株，這些植株再經(jīng)過1~2代回交和自交aaaaa色色黄色视频，即可用于雜交稻育種男人到天堂亚洲一区二区在线观看。

In order to improve the resistance to bacterial blight of high quality rice male sterile line Jinshan A , in this study, the Jinshan B and IRBB21 that carried gene Xa21 were used as parents to make backcrosses, and both foreground selection and background selection were carried out by means of marker assisted selection in the backcrosses.

本研究以IRBB21為Xa21基因的供體親本，以金山B為輪回親本進行回交免费直接在线看黄，并應(yīng)用分子標(biāo)記輔助選擇技術(shù)對回交各世代同時進行前景選擇和背景選擇黄色网站在线播放AAAAA，得到如下結(jié)果：(1)利用Xa21基因內(nèi)的STS標(biāo)記MXA21對各回交世代進行前景選擇，得到了44個帶有Xa21基因的BC_1單株和40個帶有Xa21基因的BC_2單株。

In the backcross breeding of maize, the donor parent is suggested for consideration at priority, and backcrossing only once is acceptable on the basis of strict selection of target traits in combination with determination of GCA.

因此日日夜人人操人人干福利，利用回交法改良玉米自交系久久国产片，在選準(zhǔn)供體親本的基礎(chǔ)上，回交1次后岛国毛片高清观看在线wy999，在自交過程中加強目標(biāo)性狀的鑒定選擇及配合力測定，可提高回交改良的育種效率亚洲无码色色色。

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(抗白葉枯国产影视午夜在线观看视频免费下载、螟蟲又爽又黄又舒服的网站视频、除草劑)轉(zhuǎn)基因水稻恢復(fù)系的培育(1)將恢773與攜有轉(zhuǎn)cry1Ab和bar基因的水稻新品系中國91(cry1Ab)雜交，并以恢773作為輪回親本精品国产AV最大网站下载，連續(xù)回交三代和自交一代久久免费看一级毛片一级A片，對各回交世代的單株進行cry1Ab和bar基因的PCR分析、田間抗蟲性鑒定和除草劑Basta抗性鑒定羞羞视频在线登录页面免费视频入口页面破解，經(jīng)過選擇獲得了轉(zhuǎn)基因水稻恢復(fù)系T773-1成人十八黄色网站视频国产，田間種植對螟蟲及除草劑Basta表現(xiàn)很好的抗性。

backcross：回交

2.同源導(dǎo)入近交系動物的保種和生產(chǎn) 同源導(dǎo)人近交系簡稱同源導(dǎo)入系,有時又譯為基因?qū)讼?是通過雜交與互交<CROSS-Intercross)91久久精品偷拍网站、回交(backcross)等方式將一個目的基因?qū)四硞€近交系的基因組內(nèi),而培育出來的新的近交系.

backcross：回交,反交

backbone 脊柱 | backcross 回交,反交 | backswimmer 仰泳

backcross：回交;反交;逆代交

\\"脊骨;脊柱\\",\\"backbone\\" | \\"回交;反交;逆代交\\",\\"backcross\\" | \\"基礎(chǔ)毀滅性\\",\\"background extinction\\"

backcross ratio：回交比率

回交親本 backcross parent; recurrent parent | 回交比率 backcross ratio | 背景;基底 background

backcross ratio：回交率

backcross breeding 回交育種法 | backcross ratio 回交率 | backed bill 保證票據(jù)

backcross hybrid：回交雜種

回交 backcross | 回交雜種 backcross hybrid | 回交育種法 backcross method of breeding

backcross parent：回交親本

backcourtman | (籃球隊的)后衛(wèi) | backcross parent | 回交親本 | backcross ratio | 回交比率

reciprocal backcross：交互回交;正反交

交互回交;正反交 reciprocal backcross | 正反配種 reciprocal ceoss | 交互神經(jīng)支配 reciprocal innervation

backcrossing：回交

backcrossbreeding回交育種 | backcrossing回交 | backmutation回復(fù)突變

by selfting or backcrossing：通過自交或回交

by return of post ==> 請即回示 | by selfting or backcrossing ==> 通過自交或回交 | by single action ==> 單效壓塑