不同粳稻成熟胚再生体系的研究

选取黑龙江省大面积种植的6个水稻品种成熟胚为外植体,进行愈伤组织诱导率和分化率的研究。结果表明:不同基因型品种愈伤诱导率和分化率不同,愈伤诱导率空育131最高为94.89%,垦稻18最低为46.56%,分化率垦鉴稻6最高为81.01%,空育163最低为10%;激素NAA和KT对2.4D有协同诱导作用。同一品种对不同培养基诱导效果不同,垦稻18的最佳诱导培养基为NB,另外5个品种的最佳诱导培养基为MS。     

海南林区旅游业差异化开发探讨——以海南省吊罗山国家森林公园为例

目前海南四大林区所开发的旅游产品大同小异,同质化倾向较明显。文章结合吊罗山林区实际情况,论述差异化发展在海南林区旅游业发展中的意义,并深入讨论如何实施差异化,旨在理论上探索未来海南发展森林旅游的途径方法。     

Genetic Variability in Two Tree Species,Acer platanoides L. and Betula pendula Roth,With Contrasting Life-history Traits

Genetic variation in adjacent Nordic populations of Acer platanoides L. and Betula pendula Roth was assessed by allozymes and in growth and phenology traits of juvenile trees grown in two field trials, and in growth chambers with free or restricted nutrient access. The objectives, based on the difference in the species' life-history traits, were to test the following hypotheses: (1) the population differentiation is higher in A. platanoides; (2) the genetic variability and (3) the phenotypic plasticity are larger in B. pendula. Analyses of variance revealed that, except for budburst, the growth and phenology traits generally supported the first hypothesis. The estimates of the coefficients of additive variance consistently disagreed with the second hypothesis. Allozyme data also supported the first hypothesis, but not the second. Finally, the phenotypic plasticity was larger in B. pendula.     

欧美杨108离体叶片和茎段再生体系的优化

[目的]优化欧美杨108的无性繁殖再生体系的培养条件。[方法]以欧美杨108无菌苗为材料,采用正交试验优化叶片直接分化和茎段愈伤组织分化再生体系的培养条件。[结果]欧美杨108的叶片适宜在光照下进行直接再生分化,茎段适宜在光照下进行愈伤组织诱导再生分化。叶片不定芽分化的培养基为MS基本培养基(琼脂7.00 g/L、pH 6.00、蔗糖20 g/L)附加0.60 mg/L 6-BA和0.20 mg/L NAA;茎段愈伤组织诱导培养基为WPM固体培养基附加0.75 mg/L KT和1.50 mg/L 2,4-D。不定芽诱导生根培养基为WPM固体培养(蔗糖30 g/L)附加2.00 mg/L IBA。[结论]优化了欧美杨108叶片的直接分化再生体系和茎段愈伤组织再生体系的培养条件,为其组织培养及遗传转化体系的构建提供了基础支持。     

铁皮石斛兰种子萌发及其原球茎的快繁培养条件研究

[目的]对铁皮石斛兰种子萌发及其原球茎的快繁培养条件进行研究。[方法]以铁皮石斛种子为材料,研究基本培养基、外源激素的种类和浓度及光照对铁皮石斛兰种子非共生萌发及后续分化的影响。[结果]铁皮石斛种子在光照条件下1／2MS培养基中萌发率最高,达91．63％,且萌发时间最短;在1／2MS＋0．2mr／LNAA＋0．5mg／L6-BA培养基中,原球茎的分化效果最好。[结论]该研究为实现今后铁皮石斛的工厂化生产奠定了一定基础。     

欧美杨108离体叶片和茎段再生体系的优化(英文)

[目的]优化欧美杨108的无性繁殖再生体系的培养条件。[方法]以欧美杨108无菌苗为材料,采用正交试验优化叶片直接分化和茎段愈伤组织分化再生体系的培养条件。[结果]欧美杨108的叶片适宜在光照下进行直接再生分化,茎段适宜在光照下进行愈伤组织诱导再生分化。叶片不定芽分化的培养基为MS基本培养基(琼脂7.0 g/L、pH 6.0、蔗糖20 g/L)附加0.6 mg/L 6-BA和0.2 mg/L NAA;茎段愈伤组织诱导培养基为WPM固体培养基附加0.75 mg/L KT和1.5 mg/L 2,4-D。不定芽诱导生根培养基为WPM固体培养(蔗糖30 g/L)附加2.0 mg/L IBA。[结论]该研究优化了欧美杨108叶片的直接分化再生体系和茎段愈伤组织再生体系的培养条件,为其组织培养及遗传转化体系的构建提供了基础支持。     

蚕用兽药的现状与应用

本文综述了我国目前蚕用兽药的种类和特点,认为消毒剂是养蚕必备的蚕用兽药,抗菌剂是辅助用蚕用兽药。同时,介绍了鉴别蚕用兽药的途径。     

红花苷对白血病细胞的抑制增殖和诱导分化作用

[目的]研究红花苷对K562白血病细胞的抑制增殖和诱导分化作用。[方法]以培养的K562白血病细胞为试验对象,通过XTT试验、集落形成试验、血红蛋白联苯胺染色试验以及形态学试验,考察红花苷对白血病细胞抑制增殖和诱导分化作用。[结果]红花苷剂量依赖性地抑制了K562白血病细胞的活性及集落形成(P0.05),形态学观察及联苯胺染色试验也证实了红花苷剂量依赖性地诱导K562白血病细胞向产生血红蛋白的终末细胞分化。[结论]红花苷对K562白血病细胞具有明显的抑制增殖和诱导分化作用。     

高粱幼嫩叶段愈伤诱导与植株再生

[目的]为了建立以幼嫩叶段为外植体的高粱组培技术。[方法]选用育种上常用的8个高粱恢复系材料,进行愈伤组织诱导与分化再生,研究2,4-D浓度对初级愈伤组织诱导的影响,分别对8个材料的诱导率和分化率进行统计,并观察愈伤组织形态。[结果]结果表明,2,4-D是幼嫩叶段诱导愈伤的关键因素,未添加2,4-D的培养基中不能产生愈伤,适宜的2,4-D浓度为2 mg/L。基因型对愈伤组织的质量和形态有很大的影响,不同基因型材料的诱导率和分化率存在很大差异。[结论]通过比较,筛选出了3个诱导率高、愈伤形态优良且分化率较高的基因型三尺三、R111、8643变。     

Akebia saponin D promotes differentiation of bone marrow mesenchymal stem cells into osteoblasts through MAPK signaling pathways

AIM:To explore the role of Akebia saponin D(ASD) in the differentiation of rat bone marrow-derived mesenchymal stem cells(BMSCs) into osteoblasts. METHODS:The rat BMSCs were cultured using routine methods. The effects of ASD on the differentiation of MSCs into osteoblasts were observed. The p38 mitogen-activated protein kinase(p38 MAPK) inhibitor SB203580 and extracellular signal-regulated kinase(ERK) inhibitor PD098059 were used to evaluate the mechanisms. The activity of alkaline phosphate(ALP) and content of osteocalcin(OC) were assayed during differentiation. The mRNA expression of osteoprotegerin(OPG) and receptor activator of nuclear factor-κB ligand(RANKL) was determined by real-time fluorescence quantitative PCR. The activity of p38 MAPK and ERK was measured by Western blotting. RESULTS:Six days after treatment with ASD, the mRNA expression of OPG significantly increased, while the mRNA level of RANKL significantly decreased in induced cells. ASD increased the activity of ALP and the content of OC. Moreover, ASD enhanced the activity of both p38 MAPK and ERK, which was inhibited by SB203580 and PD098059. SB203580 and PD098059 also inhibited the positive role of ASD in the differentiation of MSCs into osteoblasts. CONCLUSION:Akebia saponin D significantly enhances differentiation of rat BMSCs into osteoblasts in vitro, which may be mediated by the p38 MAPK and ERK signaling pathways.