大雪兰快速繁殖技术的研究

以大雪兰种子为试材,进行无菌播种试验,找出了最适合大雪兰种子萌发、原球茎增殖分化及生根的培养基。结果表明:利于大雪兰种子萌发的培养基是1/2MS+6-BA 0.3mg/L+NAA 0.2mg/L+椰子汁(CM)50mL/L;利于大雪兰原球茎增殖分化的培养基是1/2 MS+6-BA 0.4mg/L+NAA 0.2mg/L+AC 0.5g/L;利于生根壮苗的培养基是1/2 MS+NAA 0.5mg/L+AC 2g/L。     

象牙白花兰种子及茎尖培养与原球茎形态发生

 象牙白花兰授粉后5 个月的种子开始具有较高的萌发率; 椰乳或适量激素有利于种子的萌发;种子在萌发后胚发育形成原球茎, 原球茎经过增殖, 分化出叶片和根系, 形成完整的小植株。从播种到小植株的形成历时约7 个月。茎尖在MS + NAA 0. 1 + BA 3. 0 (单位: mg·L^-1 , 下同) + 椰乳10 %的培养基上诱导产生原球茎; 原球茎在MS + NAA 0. 1 + BA 5. 0 的培养基上增殖, 在无激素培养基上分化成芽; 小芽在附加7 %香蕉汁和3 %马铃薯汁的1/ 2 MS 培养基上诱导出根而再生完整小植株。不同pH 值、光照强度和培养方式对增殖效果有显著影响。     

影响文心兰原球茎增殖生长诸因素的研究

以文心兰茎尖为外植体,诱导原球茎,并对影响原球茎增殖的几种因素进行了研究.结果表明:文心兰茎尖在1/2 MS+BA 2 mg/L+NAA 0.3 mg/L培养基上,离体培养大约30 d后产生原球茎;原球茎在1/2 MS+BA 1 mg/L+NAA 0.2 mg/L培养基上增殖速度最快,增殖系数可达2.6;与果糖和葡萄糖相比,蔗糖更有利于原球茎增殖;30 g/L的蔗糖对原球茎增殖生长有促进作用.     

药用植物马鞭石斛组织培养与快速繁殖

以马鞭石斛(Dendrobium fimbriatum Hook.var.oculatum.Hook.)的种子为外植体进行了组织培养快速繁殖技术研究,以期筛选出适合各个阶段培养的培养基配方.结果表明:马鞭石斛种子萌发原球茎诱导的最佳培养基为MS+GA 0.1 mg/L+6-BA 1.5mg/L,诱导率达85％;KT 0.5 mg/L+6-BA 2.5 mg/L+NAA 1.0 mg/L的MS培养基最适宜马鞭石斛原球茎增殖及幼苗分化,分化率为90％;最适宜马鞭石斛生根的培养基为MS+AC 0.5 mg/L+NAA 1.0 mg/L,生根率为100％.     

白芨种子的无菌萌发过程观察和组培快繁研究

以白芨种子为培养材料,对白芨种子无菌非共生萌发过程中原球茎发育进行了研究;并以白芨组培苗的原球茎和叶片为外植体,进行白芨组织培养快速繁殖技术研究.结果表明:在白芨的种子发育过程中,种胚发育成幼苗有2种方式,1种是小球体经原球茎发育成小苗;第2种是小球体伸长成根状茎后发育成小苗.组培苗的原球茎经切割后在诱导培养基上培养,可产生增殖分化,形成丛芽.原球茎诱导的最适培养基为1/2MS+6-BA5.0 mg/L+NAA0.2 mg/L,增殖倍数为2.71.以叶片为外植体,未获得组培苗.     

铁皮石斛的种子培养

以铁皮石斛成熟种子为外植体,研究原球茎的诱导、增殖、分化和生根的最佳培养条件。结果表明:1/2 MS基础培养基最适合铁皮石斛的种子培养,45 d时原球茎诱导率达到95%;原球茎增殖的最佳培养基为1/2 MS+6-BA 0.5 mg/L+NAA 0.5 mg/L+20%马铃薯提取液,每代增殖16倍,原球茎形态好、变异少;原球茎团于1/2 MS+6-BA 2 mg/L+NAA 0.25 mg/L+20%马铃薯提取液的培养基上可诱导丛芽分化,于MS+NAA 0.5 mg/L+20%香蕉汁+活性炭5g/L的培养基上易于诱导不定根的形成,60 d后可形成健壮的完整小植株。     

多花指甲兰非共生萌发技术研究

多花指甲兰属于单轴分枝类兰花、无分蘖能力,种子在自然条件下萌发困难,自然更新能力差.研究采用人工授粉的种子,进行了非共生萌发研究.结果表明:110 d胚龄的种子萌发率高,种子萌发过程中原球体呈黄色并且无指状突起物的产生;种子萌发最佳培养基为MS+NAA 5.0 mg/L+BA 1.0 mg/L+活性碳0.6 mg/L+椰肉3.0 g/L,壮苗培养基以MS+NAA4.0 mg/L+BA 0.2 mg/L+活性碳0.6 mg/L为好,小苗用松树皮移栽效果好.该研究实现了多花指甲兰的快速繁殖,提高了其繁殖系数.     

杜鹃兰原球茎增殖培养条件

以杜鹃兰种子萌发的原球茎为试材,研究不同培养基、不同植物生长调节物质(6-BA、NAA和IBA)、活性炭、温度及光照强度对杜鹃兰原球茎增殖的影响。结果表明:1/2MS培养基为适于原球茎增殖的基本培养基;添加一定浓度的6-BA、NAA和IBA均有利于原球茎的增殖,IBA的浓度为1.0mg·L~(-1)时,原球茎增殖率较高,40d可达170.07%;适量添加活性炭对原球茎增殖有促进作用;温度及光照强度的控制对原球茎增殖是必需的。杜鹃兰原球茎增殖的适宜培养条件为1/2MS+1.0mg·L~(-1) 6-BA+1.0mg·L~(-1) IBA+0.5g·L~(-1)活性炭,温度为15℃,光照强度为2 000lx。     

通过拟原球茎发生途径建立春石斛兰的组织培养体系

以春石斛兰无菌幼苗茎段为外植体,分别研究了拟原球茎的诱导、增殖、分化、生根的培养基配方.结果表明:拟原球茎诱导率最高的培养基为KC+6-BA 0.8 mg/L+NAA 0.5 mg/L;拟原球茎增殖培养基为MS+6-BA 2.0 mg/L+NAA 0.1 mg/L;拟原球茎的分化培养基为MS+NAA 1.0 mg/L+KT 1.5 mg/L;不定芽生根培养基为1/2MS或MS+NAA 0.5 mg/L.     

春兰离体再生体系的研究

以春兰种子为外植体进行再生体系建立试验,采用正交试验方法研究基础培养基、激素浓度、天然添加物对原球茎诱导、增殖、分化的影响,筛选出适合快繁各阶段的培养体系。研究结果表明,种子诱导原球茎的最适培养基为1/2MS+2.0mg/LNAA+0.5mg/L6-BA+蔗糖30g/L+琼脂7.5g/L+活性炭2.0g/L;原球茎增殖培养基为1/2MS+0.5mg/LNAA+2.0mg/L6-BA+100ml/L椰乳+蔗糖30g/L+琼脂7.5g/L+活性炭2.0g/L;原球茎分化培养基为1/2MS+0.5mg/LNAA+1.0mg/L6-BA+0.1mg/LKT+150ml/L椰乳+蔗糖30g/L+琼脂7.5g/L+活性炭2.0g/L。     

瑞昌山药茎段组织培养研究

用不同种类、浓度的植物生长调节剂对瑞昌山药茎段进行离体培养试验.试验结果表明,诱导瑞昌山药不定芽萌发最佳培养基为MS+6-BA 1.5 mg/L+NAA 1.0 mg/L,不定芽萌芽率为90%:继代培养用MS+6-BA 0.5 mg/L+NAA 0.5 mg/L,长势较理想;生根培养用1/2 MS+NAA 0.5 mg/L+0.2 g/L活性炭的培养基,瑞昌山药生根的效果最佳.     

铁皮石斛组培苗生长的影响因素研究

以铁皮石斛组培苗为材料,研究不同蔗糖浓度对铁皮石斛原球茎(PLB)生长的影响,6-BA用量对铁皮石斛增殖芽生长的影响,不同糠源及添加物香蕉对铁皮石斛壮苗、生根的影响。结果表明:当蔗糖30g/L最有利于铁皮石斛PLB增殖,最适合PLB的培养基为MS+NAA 0.1mg/L+蔗糖30g/L。6-BA对铁皮石斛丛生芽形态建成有着很重要的作用,有利于促进芽的分化,适合继代的培养基为MS+BA 4mg/L+NAA0.1mg/L+CW5%+蔗糖30g/L。香蕉对铁皮石斛组培苗的根系生长具有显著的促进作用,以50 g/L葡萄糖为糖源更有利于铁皮石斛壮苗生长,适合生根苗生长的培养基为1/2MS+香蕉70g/L+活性炭0.1%+葡萄糖50g/L。     

Micropropagation of Dendrobium draconis Rchb. f. from thin cross-section culture

An efficient procedure is outlined for rapid and mass in vitro propagation of an orchid, Dendrobium draconis Rchb. f. through in vitro culture of thin cross-sections (TCSs) derived from young stems. The TCS explants were excised along the stem from the base to shoot tip of 6-month-old plantlets and cultured on Murashige and Skoog (MS) medium supplemented with 20 g/l sucrose and different concentrations of N⁶-benzyladenine (BA), kinetin (Kn) and 1-naphthaleneacetic acid (NAA), either individually or in combination. Protocorm-like bodies (PLBs) were directly induced from the TCS explants and completely developed into shoots within 6–7 weeks. The optimal growth regulators combination for maximal PLB development was 2 mg/l BA and 1.0 mg/l NAA, giving rise to 68% of responding explants with an average 11 PLBs per explant. Shoot development was best achieved on MS medium containing sucrose and coconut water. Plantlets, 6–8 cm height were transplanted into coconut husk peat with 92% survival rate in a nursery.     

Asymbiotic seed germination,mass propagation and seedling development of Vanda coerulea Griff ex.Lindl. (Blue Vanda): An in vitro protocol for an endangered orchid

The application of modern biotechnology for conservation of any endangered species requires an efficient in vitro regeneration protocol. In this study a reliable protocol was developed for in vitro seed germination, protocorm multiplication and subsequent plantlet regeneration of Vanda coerulea, an endangered orchid species. Among the four basal media evaluated for asymbiotic seed germination, Phytamax was found to be the best followed by Murashige and Skoog (MS). Phytamax was also found good for protocorm development. For protocorm like body (PLB) regeneration, protocorms were then further cultured on Phytamax media fortified with different phytohormones either individually or in combinations. The frequency of protocorm like body (PLB) regeneration significantly relied on kinds and concentrations of plant growth regulators used. A combination of 1-naphthaleneacetic acid (NAA) (5.36 μM) and 6-benzyle amino purine (BAP) (3.80 μM) was found to be suitable for maximum PLB regeneration. Healthy plantlets were induced from PLBs when cultured on same basal medium supplemented with activated charcoal (AC – 3.0 g/l). Plantlets with well developed leaves and roots were transplanted to pots filled with a mixture of charcoal, brick pieces and sphagnum moss and transferred to the greenhouse. This protocol will enable mass propagation and conservation of this exquisite orchid.     

陕北野生山丹丹组培快繁技术研究

以陕北地区野生的山丹丹鳞片为试材,采用单因子和正交设计研究了不同浓度IBA和NAA及其组合对山丹丹组培快繁的影响.结果表明:适合山丹丹初代培养的培养基为MS+6-BA 1.5 mg/L+NAA0.01 mg/L,芽诱导率达到100％;继代培养为MS+6-BA 2.5mg/L+IBA0.2 mg/L,繁殖系数达到9.8;生根培养为1/2MS+IBA 0.3 mg/L,生根率达到100％.     

毛毡杜鹃嫩叶直接再生芽苗及植株再生体系的建立

以毛毡杜鹃嫩叶为外植体,应用均匀设计方法筛选最适合的培养基,建立毛毡杜鹃嫩叶直接再生芽苗及植株再生体系.结果表明:最适合嫩叶直接再生芽苗的培养基为:DR+2-ip 2.7 mg/L十NAA 0.02 mg/L+KT 1.00 mg/L,诱导率达93.5%以上;生根培养基为:MS(改良)+IAA 0.10 mg/L+NAA 0.07 mg//L,生根率达97%.     

平欧杂交榛的组织培养

为了探索我国平欧杂交榛离体培养和快繁技术,以5个平欧杂交榛品种(系)的幼嫩茎段为外植体,研究其组织培养及快速繁殖技术,结果表明,(1)5月中旬为茎尖培养取材的较好时期,污染率低、萌芽率高。(2)适宜的基本培养基为DKW培养基。(3)不同基因型间的萌芽率及芽苗生长状态存在极显著差异。(4)增殖阶段较好的培养基为:DKW+TDZ1.5mg/L+IBA0.01mg/L。(5)生根培养较佳培养基为:1/2MS+NAA0.1mg/L,生根率达90%。