CC+GA混合处理对水稻种子萌发、生长及产量的影响     

杨安中  徐鹏 《安徽科技学院学报》2002,16(4):40-43

本文研究了氯化胆碱与赤霉素混合浸种对水稻种子萌发、生长及产量效应,结果表明:CC+GA混合处理能提高水稻种子呼吸强度与发芽率;提高幼苗的干重,有很好的促根壮苗效应;能增加乳熟期单株叶面积鲜重及干重;提高有效穗数、穗实粒数及千粒重,有很好的增产效应.  相似文献   

Enhancing rice resistance to fungal pathogens by transformation with cell wall degrading enzyme genes from<Emphasis Type="Italic">Trichoderma atroviride</Emphasis>     

Liu Mei  Sun Zong-xiu  Zhu Jie  Xu Tong  Gary E. Harman  Lorito Matteo 《浙江大学学报(A卷英文版)》2004,5(2):133-136

Three genes encoding for fungal cell wall degrading enzymes (CWDEs),ech42, nag70 andglu78 from the biocontrol fungusTrichoderma atroviride were inserted into the binary vector pCAMBIA1305.2 singly and in all possible combinations and transformed to rice plants. More than 1800 independently regenerated plantlets in seven different populations (for each of the three genes and each of the four gene combinations) were obtained. Theech42 gene encoding for an endochitinase increased resistance to sheath blight caused byRhizoctonia solani, while the exochitinase-encoding gene,nag70, had lesser effect. The expression level of endochitinase but exochitinase was correlated with disease resistance. Nevertheless, exochitinase enhanced the effect of endochitinase on disease resistance when the two genes co-expressed in transgenics. Resistance toMagnaporthe grisea was found in all kinds of regenerated plants including that with singlegluc78. A few lines expressing eitherech42 ornag70 gene were immune to the disease. Transgenic plants are being tested to further evaluate disease resistance at field level. This is the first report of multiple of expression of genes encoding CWDEs fromTrichoderma atroviride that result in resistance to blast and sheath blight in rice. Project (No. 3997002) supported by the National Natural Science Foundation of China  相似文献   

以温度为基础的稻纵卷叶螟发育模拟模型     

张润杰  古德祥 《中山大学学报论丛》1989,(1)

通过5种温度(19℃,22℃,25℃,28℃,31℃)处理观察稻纵卷叶螟(Cnaphalocrocismedinalis Guenee)各虫态的发育及卵的孵化时间分布:用SIGMOID函数模拟该虫在不同温度下的发育率;用发育频数累积曲线描述卵的孵化时间分布.这两个模型都能比较精确地描述卷叶螟以温度为基础的发育动态.  相似文献   

Identification of technology options for reducing nitrogen pollution in cropping systems of Pujiang     

Fang B  Wang GH  Van DB  Roetter R 《Journal of Zhejiang University. Science. B》2005,6(10):981-990

This work analyses the potential role of nitrogen pollution technology of crop systems of Pujiang, County in Eastern China‘s Zhejiang Province, rice and vegetables are important cropping systems. We used a case study approach involving comparison of farmer practices and improved technologies. This approach allows assessing the impact of technology on pollution, is forward looking, and can yield information on the potential of on-the-shelf technology and provide opportunities for technology development. The approach particularly suits newly developed rice technologies with large potential of reducing nitrogen pollution and for future rice and vegetables technologies. The results showed that substantial reductions in nitrogen pollution are feasible for both types of crops.  相似文献   

Effect of seedling age and water depth on morphological and physiological aspects of transplanted rice under high temperature   总被引：2，自引：0，他引：2  

Khakwani AA  Shiraishi M  Zubair M  Baloch MS  Naveed K  Awan I 《Journal of Zhejiang University. Science. B》2005,6(5):389-395

INTRODUCTION Rice (Oryza sativa L.) is one of the most im-portant crops in Pakistan. It is the third largest crop interms of area and production after wheat and cotton.Although rice in Pakistan is consuming large acreage,Pakistan is still far behind other rice producingcountries. The average yield is very low (2 t/ha) ascompared to Egypt (8.4 t/ha) and USA (6.6 t/ha).There are many reasons for this low yield. The mostimportant are high temperature (40?50 °C), low hu-midity at …  相似文献   

火焰原子吸收光谱法测定啤酒新原料—黑米中铁、锰、锌实验方法的研究     

邱洪久  景立新  杨丽军 《大连大学学报》1993,(3)

本文对啤酒新原料-黑米中的铁、锰、锌以混标法进行了连续测定的实验方法研究,并对脱黑后的米,进行了对照测定,结果令人满意.  相似文献   

Cloning and characterization of a glucose 6-phosphate/phosphate translocator from<Emphasis Type="Italic">Oryza sativa</Emphasis>     

Jiang Hua-wu  Dian Wei-min  Liu Fei-yan  Wu Ping 《浙江大学学报(A卷英文版)》2003,4(3):331-335

Plastids of nongreen tissues import carbon as a source of biosynthetic pathways and energy, and glucose 6-phosphate is the preferred hexose phosphate taken up by nongreen plastids. A cDNA clone encoding glucose 6-phosphate/phosphate translocator (GPT) was isolated from a cDNA library of immature seeds of rice and named asOsGPT. The cDNA has one uninterrupted open reading frame encoding a 42 kDa polypeptide possessing transit peptide consisting of 70 amino acid residues. TheOsGPT gene maps on chromosome 8 of rice and is linked to the quantitative trait locus for 1000-grain weight. The expression ofOsGPT is mainly restricted to heterotrophic tissues. These results suggest that glucose 6-phosphate imported viaGPT can be used for starch biosynthesis in rice nongreen plastids. Project supported by National Natural Scienc Foundation of China (No.39830250) and Natural Science Foundation of Zhejiang Province (No.2A0106), China. The nucleotide sequence data will appear in the GenBank under accession number AF375053.  相似文献   

QR分解和Cholesky分解的Rice条件数   总被引：1，自引：0，他引：1  

李新秀  聂小兵 《东南大学学报》2004,20(1):130-134

条件数是在计算过程中由于误差引起的放大系数, 所以条件数理论在误差分析中占有非常重要的地位. 本文运用Rice关于条件数的一般理论, 采取一种统一的方式, 在单参数扰动的情况下, 定义了与正定对称矩阵的Cholesky 分解和一般矩阵的QR分解有关的一些矩阵因子的条件数. 利用解析展开和矩阵向量方程的方法, 求出了用Frobenius 范数所定义的Rice条件数的具体表达式. 所得结果与常小文的结果类似. 在Cholesky分解情况下, 与因子矩阵L 相对应的条件数 KL是 Stewart条件数K的一个下界.  相似文献   

水稻领域知识服务系统的设计与实现     

寇远涛  赵瑞雪  鲜国建  朱亮 《数字图书馆论坛》2012,(12):43-47

随着科研方式的转变,科研用户对专业化、知识化服务的需求不断增强,因此面向专业领域构建集文献检索获取、领域知识导航、知识管理与共享和科研交流与协作等功能服务为一体的领域知识服务系统,成为信息服务机构的必然选择。文章提出了水稻领域知识服务系统的功能模型,并开发实现了系统主要功能。  相似文献   

小议日本人的“亲植物性”     

王岩  魏兰桂 《山东教育学院学报》2009,24(1):58-59

日本人具有“亲植物性”,这在日本人的日常生活特别是衣、食、住方面表现得尤为突出。这主要是受到日本稻作文化的影响,并且与日本植物物种繁多,四季景色美丽多变的优越自然环境有着密切关系。  相似文献