1990(2).
Abstract:We studied the processes of gametophyte development in Paulownia sp., with empha-sis on the mechanisms related to fertility. It was found that large amount of abortionsoccurred during the development of in both microgametophyte and megagametopyte: about50
1990(2).
Abstract:在大肠杆菌的终止子探针载体pIJ667上,neo基因的正常表达可使寄主产生较强的卡那霉索抗性。然而,把链霉菌高拷贝质粒pIJ101上的BclⅠ片段克隆到这个载体的BglⅡ位点,使neo的结构基因与其启动子隔开所做的克隆试验显示,有两个插入片段,BclⅠ-A和BclⅠ-E,可以有效地终止neo基因的转录,使大肠杆菌寄主对卡那霉素呈现敏感。这两个片段在pIJ101的限制性内切酶图谱上已得到了定位,其活性区域的大小分别为2.9和1.19kb。把pIJ101衍生的小质粒pIJ350上BclⅠ片段克隆到pIJ667中,不仅进一步暗示出pIJ101 BclⅠ-A片段上终止子功能的存在,而且把这个区域缩小到1.32kb的范围内。此外,这些终止子活性的表达显示出明显的方向性。
1990(2).
Abstract:本文描述了中国淡水枝角类新记录种——长吻高壳溞的外部形态,记述了某些生物学问题,其次详细观察并描述了头孔这一重要分类学特征。重新编列了高壳溞属分种检索表。
Gong Shiyuan , Liang Kaixue , Ku Yaomei ,
1990(2).
Abstract:本文对武昌南湖149尾雌性花Ⅳ期卵巢的个体绝对生殖力(r)和个体相对生殖力(r/L.r/W_n)的研究结果表明:花个体绝对生殖力与体长呈曲线相关,其回归方程为r=2399×10~(-5)·L~(4·500);与纯体重的关系则为直线正相关,其回归方程为r=181W_n-2257;花个体相对生殖力(r/L)随体长、纯体重的增长而增长:个体相对生殖力(r/W_n)与体长、纯体重的关系则基本保持较为稳定的状态。花个体绝对生殖力和相对生殖力(r/L)与年龄、成熟系数、鱼卵直径不同程度地呈正相关关系。花个体绝对生殖力的年增长率与绝对增长数以2冬龄为最高,3冬龄次之。
Lu Kaiyang , Yuan Shengchao , Zhang Ziguo ,
1990(2).
Abstract:Heading date of 6 strains of photoperiod-sensitive male sterile rice was compared underdifferent treatments of photoperiod length starting on the 5-leaf stage. The results showedthat reducing the light-length from 14.5 to 10.0 hr could advance heading dat
1990(2).
Abstract:Soaking of wheat seeds in brassinolide (BR) increased the number of roots andpromoted the elongation of root and plumular sheath and the accumulation of seedlingaerial part and root dry matler. But this treatment had very little effect on the heightof see
Wang Xuekui , Luo Bingshan , Qu Yinglan ,
1990(2).
Abstract:The milking speed of grains, number of grains per ear and 1000-grain weight werepromoted following 10~(-2)ppm Brassinolide (BR) solution spraying treatments duringwheat flowering period. The data indicated that BR had no significent effect on thecontent o
Lai jinru , Zheng Yonglian , Liu Jilin ,
1990(2).
Abstract:Mitochondrial DNA (mt DNA) was extracted from AN Chao(N), AN Chao CMS-T,AN Chao CMS-C, AN Chao CMS-S. It was found that only S-type cytoplasm has specificS_1, S_2 plasmid-like DNAs and they can be used as a marker for classification of S-typemale-sterile
Liu Jinlan , Nie Yichun ,
1990(2).
Abstract:The morphology and structure of the pollen grains of two Gossypium species,G. klotzschianum Anderson and G. davidsonii kellogg were studied from the taxono-mic viewpoint under the scanning electron microscope. It was found that the twoGossypium species di
Yang Guangsheng , Fu Tingdong , Chen Yongde ,
1990(2).
Abstract:The restoring fertility genes of Shan 2A cytoplasmic male sterility include majorrestoring genes and partial restoring genes. The major restoring genes exist inBrassica campestris, B. juncea, B. napus, while the partial restoring genes existin B. campestr
Lai Zhaoliang , Zong Liangbing , Wu Siyou ,
1990(2).
Abstract:The functional response of Stenus macies to its prey, Myzus persicae, and to itsown density was simulated using Holling and Watt models. The functional response ofthe adult and the larve of the predator to the prey and to its own population densitycan be
Xu Fenglin , Li Xueyuan , Dong Yuanhua ,
1990(2).
Abstract:The clay minerals of red earth mainly consist of kaolinite and hydromicas, whilethose of the yellow-brown earth mainly consist of hydromicas, kaolinite and vermicu-lite. And all of the soils have few amount of 14(?) intergradient minerals. According to th
Cao Shengyan , Wei Mingxin , Peng Zhongzhen , Yu Chuanzhou ,
1990(2).
Abstract:In animal breeding, index selection usually can not achieve the expected efficiencybecause of large sampling errors in estimating genetic parameters. In order to decreasethe sampling error, and increase the efficiency of the selection, we proposed a metho
Xue Weiguang , Qin lirang , Lei jianbao ,
1990(2).
Abstract:Changes of pathomorphology in experimental chronic selenosis of Wister rats hadbeen studied. Forty six male wister rats, weighing 105-135 grams were divided intotwo groups. Twenty eight rats in the experimental group were fed basal diet supplem-ented with
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