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1.
以旱稻为母本,高粱为父本进行属间远缘杂交,获得了稳定的杂交后代.测定开花期杂交后代及亲本旗叶光合性能,结果表明,杂交后代与母本相比,具有较高的净光合速率和水分利用效率,说明后代中有父本高粱优良基因导入. 相似文献
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盐胁迫对旱稻/长芒稗、高粱及三属杂交后代幼苗的影响 总被引：1，自引：0，他引：1
用不同浓度的NaCl模拟盐害处理旱稻/长芒稗杂交后代、高粱及三属杂交后代幼苗,实验结果表明,随NaCl浓度的增大,3种材料幼苗光合速率、蒸腾速率均呈下降趋势,但水分利用率提高,幼苗叶片丙二醛含量逐渐上升,脯氨酸含量上升,POD活性也呈上升趋势,SOD活性增大.相比之下,父本高粱有较强的抗盐能力,旱稻抗盐性弱,但三属杂交后代的表现优于母本旱稻/长芒稗. 相似文献
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正交与反交是相对而言的,是具有相对性状的亲本杂交,如以甲作母本、乙作父本的杂交为正交,而以乙作母本、甲作父本的杂交为反交。 相似文献
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试题1:玉米的子粒有色(C)对无色(c)为显性.以玉米纯合有色的第9染色体的三体(2n+19)为母本,以无色的正常玉米(2n)为父本进行杂交.如果n和n+1配子均可育,那么:假定C基因在第9染色体上,使F1群体中的三体植株与父本回交,后代的表现型种类和比例如何?
参考答案为:回交后代表现型有有色籽粒和无色籽粒,其比例为3∶1. 相似文献
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1 三倍体种子培育过程中的疑问 从理论上来说,培育三倍体种子可以有2套方案:一是以四倍体植株作为母本,二倍体植株作为父本,进行杂交(教材中方案);二是以四倍体植株作为父本,二倍体植株作为母本,进行杂交.如果把第一套方案当作正交,那么,第二套方案则称为反交. 相似文献
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经济杂交猪,不择食,长得快,省饲料,好饲养,因此农户都喜欢挑选杂交苗猪养肥猪。由于杂交苗猪市场行情好,有的农户就买杂交公猪作种猪用,与本地母猪配种,结果所产后代失去杂交优势,许多成了小僵猪。经济杂交猪是以生产性能较低的地方母猪作母本,用国外优良品种的公猪作父本进行杂交所产生的后代,它具有生活力强、生长发育快、产肉多、耐粗饲、省饲料、适应力强等杂交优势,从而提高育肥效果和降低养猪成本。但如果再用杂交一代与本地母猪交配,所产生的后代生产性能就会降低。这是因为杂交猪是由两个具有一定遗传差异的品种杂交产… 相似文献
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1正反交的概念
正反交（reciprocod cross）是指两个具有不同基因型的杂交亲本杂交时配置父母本的两种方式。例如，用A、B两种不同基因型的亲本杂交时，若以A为母本、B为父本为正交，则以B为母本、A为父本称为反交。因此正反交是相对而言的。由于正反交的遗传结果可因遗传方式不同而有差别，因此可用来检验伴性遗传及细胞质遗传等。 相似文献
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色素万寿菊子一代（F1）种子是由一种雄性不育系做母本与一种自交系做父本经杂交育成。杂交所用父、母本是根据孟德尔的基因分离重组规律,由进口F1种子经自交、回交、分离、转育、提纯等过程而获得。 相似文献
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通过对高粱 苏丹草杂交种品质性状的调查与分析 ,发现高粱 苏丹草杂交种营养丰富 ,氰化物含量低 ,适口性好 ,可作为畜牧、水产养殖业青刈或青贮的优质饲料 相似文献
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A comparative study on the photosynthetic parameters among intergeneric progenies derived from Oryza sativa L.×Sorghum vulgare L., its maternal parent Gui 630 and commercial 3-line hybrid rice Shanyou 63 in pot experiment in greenhouse was conducted. The morphological and photosynthetic characters of canopy leaves and chlorophyll fluorescence kinetic parameters including Fv/Fm, Fv/F0, photochemical quenching coefficient and non-photochemical coefficient of canopy leaves of 3 varieties were measured. The results showed the progeny, Yuanyou 1, derived from an intergeneric cross of rice and sorghum possesses better canopy spatial architecture with thicker, heavier and bigger canopy leaf than its maternal parent Gui 630. Higher photosynthetic rate due to higher chlorophyll content, higher primary energy transformation efficiency, potential of PSII and non-photochemical quenching coefficient (qE) were also measured in Yuanyou 1. These explain partly why the intergeneric progeny has higher biomass production, and better tolerance to adverse conditions and higher field yields even under stress conditions. 相似文献
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A comparative study on the photosynthetic parameters among intergeneric progenies derived fromOryza sativa L.×Sorghum vulgare L., its maternal parent Gui 630 and commercial 3-line hybrid rice Shanyou 63 in pot experiment in greenhouse was conducted.
The morphological and photosynthetic characters of canopy leaves and chlorophyll fluorescence kinetic parameters includingF
v/F
m,F
v/F
0, photochemical quenching coefficient and non-photochemical coefficient of canopy leaves of 3 varieties were measured. The
results showed the progeny, Yanyou 1, derived from an intergeneric cross of rice and sorghum possesses better canopy spatial
architecture with thicker, heavier and bigger canopy leaf than its maternal parent Gui 630. Higher photosynthetic rate due
to higher chlorophyll content, higher primary energy transformation efficiency, potential of PSII and non-photochemical quenching
coefficient (q
E) were also measured in Yuanyou 1. These explain partly why the intergeneric progeny has higher biomass production, and better
tolerance to adverse conditions and higher field yields even under stress conditions. 相似文献
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属间远缘杂交水稻耐铁毒性研究 总被引：4，自引：0，他引：4
以吉田昌—培养液为对照，添加不同浓度ＦｅＳＯ４作为铁毒胁迫处理，对二个属间远缘杂交水稻“远诱１号”和“遗传工程水稻１号”及三系杂交组合“汕优６３”二叶龄幼苗进行耐铁毒性比较鉴定．试验结果表明，３个试验材料的耐铁毒性以高粱稻远诱１号及三系稻汕优６３较强，遗传工程水稻１号耐铁毒性相对较弱．根据溶液中Ｆｅ２＋／Ｆｅ３＋的变化规律，稻体内持铁量的差异，稻株根系氧化力的区别，拒斥可能是汕优６３的耐铁毒性生理基础，遗传工程水稻１号的耐性机制为容耐，而远诱１号的耐铁生理基础兼具拒斥与氧化双重机制而偏倚于主动氧化机制．体内钾、硅、镁、钙含量与铁离子含量密切相关，丰富的钾、硅、镁可以改善水稻的耐铁毒性 相似文献
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将萤火虫萤光素酶基因重组到质粒pBR325中,通过“三亲交配”和同源重组,将萤光素酶基因整合到Ti质粒pGV3850:1103。通过改良的叶盘转化法,用萤光素酶基因转化单子叶植物花叶芋,获得转基因植株。对再生植株的胭脂碱测定、新霉素磷酸转移酶分析、DNA点杂交、萤光素酶基因活性测定,证明萤光素酶基因已转化到花叶芋中并进行了表达。 相似文献
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用扫描电镜观察比较了共培养中农杆菌与烟草、花叶芋相互作用的差异.在烟草幼苗叶盘、茎的断面,观察到大量的细菌附着。它们通过菌体与细胞壁紧密接触、或通过纤维丝连接附着到烟草的伤口表面。类似的附着现象在花叶芋茎段表面也观察到.农杆菌能以与在烟草中相同的附着方式附着到花叶芋幼苗茎段伤口表面,特别是对维管束内及维管束周围的组织具有最大的亲和性,大量地附着到茎段维管束区域,但不能附着到叶盘断面的叶肉细胞上. 相似文献
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The genetic basis of heterosis was studied through mid-parent, standard variety and better parent for 11 quantitative traits in 17 parental lines and their 10 selected hybrids in rice (Oryza sativa L.). The characters were plant height, days to flag leaf initiation, days to first panicle initiation, days to 100% flowering, panicle length, flag leaf length, days to maturity, number of fertile spikelet/panicle, number of effective tillers/hill, grain yield/10-hill, and 1000-grain weight. In general the hybrids performed significantly better than the respective parents. Significant heterosis was observed for most of the studied characters. Among the 10 hybrids, four hybrids viz., 17A×45R, 25A×37R, 27A×39R, 31A×47R, and 35A×47R showed highest heterosis in 10-hill grain yield/10-hill. Inbreeding depression of F2 progeny was also studied for 11 characters of 10 hybrids. Both positive and negative inbreeding depression were found in many crosses for the studied characters, but none was found significant. Selection of good parents was found to be the most important for developing high yielding hybrid rice varieties. 相似文献
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ALAM M.F. KHAN M.R. NURUZZAMAN M. PARVEZ S. SWARAZ A.M. ALAM I. AHSAN N. 《Journal of Zhejiang University. Science. B》2004,(4)
INTRODUCTIONAlthoughriceisanaturallyself-pollinatedcrop,strongheterosisisobservedintheirF1hybrids.HeterosisorhybridvigorismanifestedasimprovedperformanceforF1hybridsgeneratedbycrossingtwoinbredparents.Heterosiscanbedefinedquan-titativelyasanupwarddeviationofthemid-parent,basedonthemeanvaluesofthetwoparents(JohnsonandHutchinson,1993).Heterosismaybepositiveornegative.Dependinguponbreedingob-jectives,bothpositiveandnegativeheterosisareusefulforcropimprovement.Ingeneral,positiveheterosisisd… 相似文献
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调查研究表明:云浮县六个乡的陆生植物环境主要受锌、铁、氟和磷的污染;作物中污染物含量是芥菜>萝卜>稻谷,这说明主要是受大气污染影响。而大气中主要污染物是大气氟和二氧化硫;靠近西江的白云、富强、南胜、企岭等地受到污染较重。 相似文献
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《红高粱》电影在1987年拍摄完成,距今已有将近三十年的时间。莫言获得诺贝尔文学奖后,他的小说被改编成电视剧的呼声越来越高,终于《红高梁》的电视剧版本就要在今年开拍。从媒介差异、表达形式差异、叙事容量差异三个方面探讨了电视剧艺术和电影艺术的差别性,希望《红高粱》这部小说的电视剧改编能遵循电视剧独特的艺术规律,而不只是沿袭电影改编的方法和经验。 相似文献