Approaches for Preventing the Male Sterllity Fluctuation of Photo-thermo-sensitive Genic Male Sterile Lines in Rice     

Xiao Guoying  Tang Li  Deng Xiaoxiang  Yuan Longping 《农业科学与技术》2001,2(1)

The male sterility fluctuation of photo-thermo-sensitive genic ma1e sterile〔P(T) GMS〕lines induced by low air temperature is a key problem troubling the application of two-line system hybrid rice. The paper suggests to solve this problem by the breeding approeches, i.e, developing low sterile critical temperature P(T)GMS lines, herbicie resistant restorer lines, herbicide sensitive P(T)GMS lines and tetracycline-conditioned P(T)GMS lines to ensure the hybrid purity; and by the hybrid seed production techniques, i.e, taking the correct procedure of foundation seed production, the suitable district and season for hybrid seed production and the deep irrigation method against cold weather in high summer.  相似文献   

Evidences for the control of chromosome number variation by a programmed-cell-death-like pathway in citrus callus     

Yu-Jin Hao  Chun-Xiang You  Xiu-Xin Deng 《Euphytica》2005,143(1-2):235-235

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我校实验教学应建立档案管理     

邓贵琴 《金陵科技学院学报》1995,(2)

根据我校实验教学及管理的现状,阐明了建立实验教学档案的必要性及如何进行档案管理。  相似文献   

浅谈HACCP在机制针形名茶中的应用     

邓敏  徐泽  张玲  胡翔 《西南园艺》2005,33(4):41-42

对HACCP作简要介绍，根据HACCP体系的要求，分析了机制针形名茶过程中各个环节可能出现的危害因素，用HACCP的原理确立了关键控制点，并且建立了相应的控制措施。  相似文献   

椰糠对黄瓜穴盘苗生长发育的影响   总被引：12，自引：0，他引：12  

赵瑞  张玉龙  陈俊琴  须晖  马健 《中国蔬菜》2005,1(12):22-23

将草炭、椰糠、蛭石按不同比例配制育苗基质,探讨椰糠对黄瓜秧苗生长发育的影响。结果表明,椰糠具有较好的保水性,酸碱度适合于作为穴盘育苗基质,出苗情况较好,秧苗质量高,证明椰糠是一种良好的园艺栽培基质。  相似文献   

在不同提取方法下蜜蜂基因组DNA浓度的比较   总被引：7，自引：1，他引：7  

吉挺  陈晶  潘瑞 《中国蜂业》2005,56(12):10-11

本研究采用了国内外常见的5种蜜蜂基因组DNA抽提的方法,对意大利蜂工蜂基因组DNA进行提取,并进行了浓度检测.其中方法1,方法2采用的是5日龄的工蜂蛹体,而其他3种方法采用的是成年工蜂的头胸部进行提取.试验结果表明这5种方法之间差异极显著,其中方法2的浓度最高,为84.7850±24.5974,说明在相同实验条件下,方法2(蜜蜂蛹体一次抽提法)在浓度层次上效果最好.  相似文献   

人为影响下古尔班通古特沙漠小尺度生态环境变化   总被引：1，自引：1，他引：1  

钱亦兵  张立运  雷加强  吴兆宁  张锐 《干旱区资源与环境》2003,17(6):82-88

随着沙漠中油气资源勘探开发、公路建设和重大工程相继实施 ,对生态环境的人为影响日益加深。本文以重大工程实验点为例 ,通过研究对比工程影响区内人工沙垄和自然沙垄的砂质新成土理化性状和植被群落特征 ,指出了沙漠生态环境在人为干扰下发生的一系列变化 ,以及受损生态环境在人们采取积极补救措施的情况下所具有的自然修复能力  相似文献   

Relationship between the intracellular calcium concentration changes and left ventricular hypertrophy and function in the spontaneously hypertensive rats     

XU Rui  ZHANG Yun  ZHANG Mei  GE Zhi-ming  CHEN Wen-qiang  LI Xiu-chang  CAI Heng  ZHU Hui 《园艺学报》2003,19(5):642-644

AIM:To elucidate the relationship between the intracellular calcium concentration changes and left ventricular hypertrophy and function in the spontaneously hypertensive rats (SHR).METHODS:Intracellular free calcium concentrations were measured by Fura 2 methodology and left ventricular function quantitated by cardiac catheterization in 20 SHR aged 10, 22, and 34 weeks and 20 age-matched Wistar-kyoto (WKY) rats.RESULTS:(1) The systolic blood pressure(SBP), intracellular calcium concentrations and left ventricular mass / body weight index (LVM/BW) were significantly higher in all three age groups of SHR than the corresponding groups of WKY; (2) Compared with age-matched WKY groups, the peak left ventricular pressure descending rate(-dp／dt_max) decreased while left ventricular relaxation time constant (τ)increased significantly in SHR aged 22 and 34 weeks. The peak left ventricular pressure ascending rate(dp／dt_max) and the left ventricular contractility index were significantly increased only in the 34 weeks SHR; (3) Intracellular calcium concentrations showed a positive correlation with LVM/BW,SBP,-dp／dt_max and τ(r=0.47-0.83,P<0.01)and a negative correlation with dp／dt_max and the left ventricular contractility index (r=-0.46,P<0.05 and r=-0.81, P<0.01).CONCLUSION:Intracellular calcium overload is one of the potential mechanisms in the induction of left ventricular hypertrophy as well as of systolic and diastolic dysfunction.  相似文献   

Effects of FK506 on anti-glomerular basement membrane nephritis in rats     

TANG Ren-xian  WANG Ying-wei  HUANG Rui  GAO Feng-guang  LIU Xiao-mei 《园艺学报》2003,19(12):1631-1634

AIM:To investigate the effects of FK506 on anti-glomerular basement membrane(GBM) nephritis in rats. METHODS: Anti-GBM nephritis model was elaborated by rabbit anti-rat GBM antibody injection in SD rats in this study. The rats were divided into three groups: FK506 treated group(0.5 mg·kg^-1·d^-1, sc), untreated nephritis control group and normal control group. FK506 was administered daily six hours after injection of anti-GBM IgG. All the rats were observed urinary protein at the 4th day, the 14th day and the 21st day. At the same time, the kidney specimens were collected, and T cell transforming function was also monitored.RESULTS:Rats injected with rabbit anti-GBM Ab developed heavy proteinuria by 4 days, and serum creatinine and serum urea appeared which kept on the rising. Glmerular hypercellularity, crescents, and protein casts were observed in nephritic rats. By electron microscopy, the thickening of GBM and loss of foot processes were seen. T cell transforming function was higher than normal. But, all pathological changes obviously turned for the better in FK506 treated group. CONCLUSION:FK506 could inhibit the progression of rat anti-GBM nephritis.  相似文献   

一种监测棉铃虫对Bt杀虫晶体蛋白抗性的技术   总被引：1，自引：0，他引：1  

范贤林  芮昌辉  孟香清  梁桂梅  李永平 《植物保护学报》2002,29(3):254-258

研究了以诊断试剂盒监测棉铃虫对苏云金杆菌(Bt)杀虫晶体蛋白(ICP)抗性的技术。将1日龄幼虫在含诊断剂量的饲料中(每毫升饲料含Bt ICP0.01mg)取食7天,以生长至3龄以上的个体作为抗性个体的判断指标;筛选出人工饲料中防腐剂剂量的最佳值为每350毫升饲料中含丙酸2.5ml。经对多个棉铃虫不同抗性种群的验证试验,证明诊断试剂盒检测抗性个体频率较为精确且应用简便。  相似文献