梨三倍体新品种龙园洋红的选育     

任爱华  王晓祥  尹金凤 《黑龙江农业科学》2006,(1):21-23

龙园洋红梨是梨三倍体新品种,亲本为56-520×乔玛,抗寒性强,短枝型.果实不规则长椭圆形,果形指数1.13,平均单果重185.5 g,每个果实平均2.5粒种子,种子小、不饱满,多畸形.果皮浅黄色,阳面有红晕,果肉乳白色,肉质细软多汁,风味甜,有香气,可溶性固形物16.05%.果实在哈尔滨地区9月中旬成熟.  相似文献   

双抗虫基因三倍体毛白杨对舞毒蛾幼虫的抗性研究     

袁胜亮  张娜  周国娜 《北方园艺》2012,(2):141-143

用室内群体饲养舞毒蛾幼虫的方法,对15个双抗基因三倍体毛白杨株系进行饲虫试验。结果表明:校正死亡率划分了高抗、中抗、低抗虫植株,舞毒蛾校正死亡率在95以上为高抗株系;40～75为中抗株系,30以下为低抗株系。舞毒蛾的发育历期、蜕皮指数和毒效反映的规律相一致。  相似文献   

杂交三倍体泥鳅性腺发育观察及其基因表达分析     

孙雨晴  陈琦  郑欣宜  徐其征  庄子昕  王伟  曹小娟  周贺 《华中农业大学学报》2020,39(2):82-88

以杂交三倍体泥鳅(4n♀×2n♂)为研究对象,对其早期性腺分化的组织学进行观察,并采用荧光定量PCR(qRT-PCR)技术,对杂交三倍体泥鳅早期不同发育时期(孵化后4、14、21、23、50、60和65d)和不同组织(性腺、肝脏、肌肉、肠、鳃、鳍、皮肤和脑)中性腺发育相关基因(hormad1、dmrt1-a)的表达量进行定量检测。研究结果发现:在早期不同发育时期,hormad1和dmrt1-a基因均为在4日龄中表达量最高,14日龄次之,在50日龄中表达量最低。在不同组织中,hormad1基因在雌鱼的鳍中表达量最高,肝脏中表达量最低;在雄鱼的性脑腺中表达量最高,肝脏中表达量最低。dmrt1-a基因在雌雄鱼的性腺中表达量最高,脑中表达量最低。杂交三倍体泥鳅早期性腺的分化和发生与二倍体泥鳅无差别,可观察到原始生殖细胞、原始生殖细胞的迁移和原始性腺的生成及性腺的分化等过程。研究结果表明,hormad1、dmrt1-a这2个基因与杂交三倍体泥鳅早期性腺发育密切相关。  相似文献   

三倍体虹鳟(Oncorhynchus mykiss)血细胞发生的形态学研究   总被引：1，自引：0，他引：1  

韩英  王琨  刘蔓  张澜澜  张贵学 《淡水渔业》2008,38(5)

观察和测定了三倍体虹鳟(Oncorhynchus mykiss)肝脏、脾脏、头肾和外周血液血细胞的发生过程。结果显示:三倍体虹鳟外周血红细胞具有分裂的能力,外周血液是其进一步发育成熟的场所,其进一步发育成熟有核质非同步分裂(核分裂先于质分裂呈双核型)和核质哑铃型同步分裂两种形式。外周血液中未成熟红细胞、单核细胞、淋巴细胞和粒细胞细胞比例分别为5.81%、4.14%、4.52%和3.38%,其4类未成熟细胞比例明显高于造血器官;外周血液中成熟红细胞为69.6%,与造血器官成熟红细胞的比例无显著差异;外周血中单核细胞、淋巴细胞和粒细胞细胞比例分别为6.60%、4.71%和1.24%,三类细胞比例明显低于造血器官(头肾中单核细胞除外)。  相似文献   

三倍体毛白杨低硬度NaOH-AQ浆全无氯漂白的研究     

吉兴香陈嘉川  杨桂花石洪涛 《林产化学与工业》2005,25(10):116-120

通过实验探讨了三倍体毛白杨低硬度NaOH-AQ浆（卡伯值13．5，粘度851mL／g。白度37％，ISO）H2O2强化氧脱木质素（QOP）的工艺务件，在此基础上提出了QOP、QP全无氯漂白的漂序，此漂序可以把该纸浆漂至82．0％（ISO），粘度保持在716mL／g，漂后纸浆得率91．78％，而且该漂序可操作性强，是一种适合低硬度NaOH-AQ浆的全无氯漂白新工艺。  相似文献   

三倍体毛白杨的木材构造与材性的研究   总被引：4，自引：0，他引：4  

赵泾峰  王新爱等 《陕西林业科技》2001,(4):1-3,22

对三倍体毛白杨的木材构造特征、纤维形态、基本密度进行了观察记载和测定，发现其生长轮宽度达2.5～3.0cm，纤维平均长度大于同年轮的其它杨木，基本密度小于毛白杨成熟材，木纤维的含量较高，同时纤维的壁腔比较小，所以三倍体毛白杨是一种较好的造纸和纤维工业原料。  相似文献   

Lignin Characterization of Triploid Clones of Populus tomentosa Carr.   总被引：2，自引：0，他引：2  

Jin Xiao-juan Pu Jun-wen Xie Yi-min Takeshi Furuno Liu Xin-yu 《中国林学(英文版)》2005,7(2):52-56

In order to understand the structural characteristics of lignin in triploid clones ofPopulus tomentosa and its changes in the processes of pulping and bleaching, milled wood lignin （MWL）, lignin carbohydrate complex （LCC） and the residual lignin from kraft pulp （KP） and sulfite pulp （SP） were isolated and analyzed by Fourier transform infrared （FTIR） spectrum and ^13C nuclear magnetic resonance （NMR）. The most diagnostic peaks were assigned and the differences were discussed. The spectral patterns reveal that triploid P tomentosa shows the specific features of hardwood from temperate areas, but in the spectrum of FTIR, the strength ratio orAl270 cm^-1 to A1226 cm^-1 is 0.88, higher than the average of hardwood from temperate areas, which will make the lignin delignification more difficult during pulping and bleaching. The LCC from triploid P tomentosa is mainly composed of xyloglucan and glucuronic acid, and other glucides have much lower ratio. In LCC FTIR, there are three peaks at 1 427, 1 329 and 1 046 cm^-1, indicating that both semi-cellulose and cellulose could exist in LCC, and that there might be relationships between cellulose and lignin. Compared with the residual lignin from KP and SP, the condensed structure in KP is more than that in SP.  相似文献   

双斑东方鲀三倍体育苗生产性研究     

尤颖哲 《齐鲁渔业》2006,23(5):1-3

采用温度休克方法诱导双斑东方鲀三倍体,在水温18-20℃条件下,卵受精后5分钟用40℃的水处理双斑东方鲀受精卵10分钟,三倍体诱导率100％,孵化率相对诱导量达25％;育苗采用前期室内工厂化培育与后期土池培育相结合方法,培育出全为三倍体(体长3 cm以上)苗种5．8万尾,对应孵出苗量,成活率为34．6％。  相似文献   

Digestive protease activities and free amino acids in white muscle as indicators for feed conversion efficiency and growth rate in Atlantic salmon (Salmo salar L.)     

J. Sunde  G.L. Taranger  K. Rungruangsak-Torrissen 《Fish physiology and biochemistry》2001,25(4):335-345

The aim of the present experiment was to screen several biochemical indices in fish and their interrelations in order to select variables for future studies of growth rate and feed conversion. Several parameters [trypsin activity, chymotrypsin activity, free amino acids (FAA) in plasma and white muscle, and RNA and RNA/protein ratio in the white muscle] were measured together with specific growth rate (SGR), feed intake and feed conversion efficiency (FCE) in four groups of diploid or triploid Atlantic salmon (Salmo salar L.) reared under different light regimes. SGR was measured on individually tagged fish, whereas feed intake and feed conversion was estimated on tank basis. A principal component analysis (PCA) explained 80.6% of the variance in the data, using all measured parameters, regardless of ploidy and light regime. Muscle free hydroxyproline showed the highest correlation, alone explaining 55% of SGR variability. The SGR also significantly correlated with trypsin activity (r=0.34), the activity ratio of trypsin to chymotrypsin (T/C) (r=0.39), plasma essential FAA (EAA) (r=0.39), plasma total FAA (TFAA) (r=0.37), the ratio of essential to non-essential FAA (EAA/NEAA) in the white muscle (r=–0.45), muscle RNA (r=–0.45) and RNA/protein ratio (r=–0.41). Tank FCE correlated positively (r=0.97) with SGR, T/C ratio and muscle free hydroxyproline, and negatively (r=–0.90) with muscle EAA/NEAA. The groups reared under continuous light (LL) regime showed significantly higher SGR than simulated natural photoperiod (SNP) groups, and with an apparently higher FCE. A higher growth rate was associated with either a higher consumption rate and/or a higher feed utilization. A negative correlation between muscle RNA concentration and SGR may indicate that increased growth rate under LL regime was not caused by an increased protein deposition rate.  相似文献   

三倍体鲶鱼的形态学性状及生长   总被引：4，自引：0，他引：4  

尹洪滨  孙中武等 《水产学杂志》1996,9(2):23-26

采用静水压休克法人工诱导鲶鱼受精卵，使三倍体出现率达100％，其主要形态学性状同二倍体鲶鱼比较研究表明，三倍体鲶鱼具有体形大，相对体高及丰满度均较高，体长差异不明显，外部形态及摄食仍保留着二倍体鲶鱼的特征，但比二倍体鲶鱼增长快，在池塘养殖90天后，体重比二倍体鲶鱼平均增加39．71％。试验证明三倍体鲶鱼是具有养殖生产前景和推广价值的新对象。  相似文献