Effect of position and orientation of leaflet explants with respect to plant growth regulators on micropropagation of Zamioculcas zamiifolia Engl. (ZZ)

Micropropagation studies on Zamioculcas zamiifolia Engl. (ZZ) as to the position and orientation of leaflet explants and plant growth regulators were carried out. Explants consisted of leaflet lamina from the basal or apical part of the leaflet with or without petiolule or midrib that were placed vertically into the medium except for the explants with midrib from the basal part of the leaflet that were placed horizontally as well. The explants were cultured on solid Murashige and Skoog medium (MS) with 30 g l⁻¹ sucrose, supplemented with 2,4-dichlorophenoxyacetic acid (2,4-D) at 2 or 4 mg l⁻¹ and 6-benzyladenine (BA) at 0 or 4.44 μM in all (four) possible combinations, or with 1-naphteleneacetic acid (NAA) at 0 or 5.38 μM and BA at 0 or 4.44 μM in all (four) possible combinations (establishment medium). The morphogenic response was direct from all types of leaflet explants and varied only with respect to different plant growth regulators of the medium: 2,4-D combined or not with BA formed somatic embryo-like structures; NAA alone produced tubers and roots; BA alone resulted mainly in leaves; NAA combined with BA produced mainly roots. The intensity of the response varied accordingly to the explant type and orientation. Explants with petiolule or midrib from the basal part of the leaflet showed the highest morphogenic response compared to explants without petiolule or midrib or to explants from the apical part of the leaflet, in all the plant growth regulator combinations used. Explants with midrib from the basal part of the leaflet placed vertically into the media showed higher morphogenic response compared to those placed horizontally on the medium surface. With the objective to regenerate plantlets, explants were subcultured on MS with NAA and BA at various concentrations based on the explant response in the establishment medium, taking into consideration the initial explant type. The initial explant type did not affect the response in the subculture. Most plantlets (a tuber with roots and one leaf with one pair of leaflets) were produced by explants with embryo-like structures induced in a medium with only 2,4-D. Explants with tubers induced in a medium with NAA gave plantlets at 65–85% when subcultured in a medium with 4.44 μM BA alone or in combination with 2.69 μM NAA. Explants with leaves induced in a medium with BA and explants with roots induced in a medium with NAA and BA gave plantlets at low percentages (20–40%). The best response was produced by explants with embryo like structures induced in a medium with only 2,4-D which gave plantlets at 100% when subcultured in the medium with 2.69 μM NAA and 2.22 μM BA. Plantlets raised in different treatments were transplanted ex vitro after 22 weeks and exhibited 80–100% survival.     

尾叶桉丛生芽和生根的诱导

为了建立优良尾叶桉无性系组织培养与再生体系．培育速生耐寒转基因桉树新品种，研究了以广西林业科学研究院提供的尾叶桉（Eucalyptus urophylla）无菌苗为材料，选取带腋芽茎段作为外植体．诱导丛生芽的发生以及植株再生的过程。通过多种生长调节剂不同浓度组合的对比试验，筛选出尾叶桉茎芽分化的最佳培养基为MS＋ZT0．5mg／L＋NAA0．4mg／L；芽继代增殖最佳培养基为MS＋ZT0．5mg／L＋NAA0．2mg／L；适合生根的培养基为1／2MS＋NAA2．0mg／L＋IBA0．3mg／L。     

Proteomic analysis of differentially expressed proteins in longan flowering reversion buds

A proteomic approach was taken to compare the proteomes of normal flowering buds and flowering reversion buds in longan (Dimocarpus longan Lour. cv. Longyou). Two-dimensional gel electrophoresis (2-DE), coupled with mass spectroscopy and protein database searching, recognized 18 proteins that were differentially expressed in flowering reversion buds. Eleven of these were down-regulated, whereas seven were up-regulated. A subset of 13 proteins was identified by MALDI-TOF-TOF/MS and classified into regulatory proteins (kinase, 20S proteasome alpha 6 subunit, putative alpha 7 proteasome subunit, auxin-induced protein, and abscisic stress ripening-like protein), antioxidant-related proteins (Chain A, GDP-mannose-3′,5′-epimerase, putative lactoylglutathione lyase, and Chain A, ascorbate peroxidase), pollen fertility-related proteins (putative leucoanthocyanidin reductase 2, and putative isoflavone reductase), photosynthesis-related proteins (large subunit, ribulose-bisphosphate carboxylase–oxygenase), and molecular chaperones (disulfide isomerase). Among them, regulatory and antioxidant-related proteins accounted for almost two-thirds of these proteins, suggesting that they may play a more important role in bud differentiation. Identification of these proteins provides insights that may lead to a better understanding of the molecular basis for flowering reversion in longan.     

美人指葡萄不定芽离体诱导再生植株的研究

6-BA、TDZ与IBA不同浓度组合对美人指葡萄叶片、叶柄和茎段不定芽离体器官发生途径诱导再生植株有不同的影响。以茎段为外植体在MS+6-BA1.0mg/L+IBA0.01mg/L培养基上分化效果最好,再生率75.00%;叶片、叶柄分别在MS+6-BA3.0mg/L+IBA0.10mg/L和MS+6-BA2.0mg/L+IBA0.05mg/L培养基上分化效果较好。TDZ和IBA研究的几种组合都能诱导不定芽再生,但再生率不高。     

诱导黄瓜直接器官发生主要影响因素的研究

 对诱导黄瓜直接器官发生的主要因素进行了探讨。结果表明: 外植体类型、基因型及植物生长调节剂对再生频率均有显著影响。子叶节是最佳的外植体类型; ‘长春密刺’及‘龙杂黄七号’再生频率较高, 分别达到93. 2 %和92. 5 % , 前者每块外植体上的平均芽数(13. 2) 极显著高于后者(3. 1) ; 62BA 单独存在即可诱导产生丛生芽, 0. 5 mg/ mL 最佳。     

尾圆桉离体芽组培快繁技术研究

以尾圆桉优良单株萌芽条作外植体,通过对外植体腋芽诱导,芽生长分化培养再生植株的试验,筛选出始芽萌动、丛芽增殖、壮苗培养,不定根诱导等各培养阶段适宜的培养基;继代芽增殖倍数3.2倍/30 d,单芽诱导生根率达95%以上。     

培养基因子对粉蕉芽分化的影响

对粉蕉芽组织培养的培养基因子进行了研究 ,结果表明 :采用MS 3 0mg/L 6 -BA 30g/L蔗糖 5 3g/L卡拉胶、pH值为 5 4条件下最适合粉蕉芽组培苗的芽分化 ,继代培养增殖率达到 2 2 0 0倍 ,生物量增量达到 8 12g。     

利用多因子正交试验建立桑的无菌快繁体系

以桑侧枝茎段为材料,利用L9(34)正交设计探讨培养基种类和激素配比对桑茎段丛生芽诱导效率的影响,并对影响桑外植体生根的主要因子进行了研究.结果表明:A2B2C1为诱导出芽的最佳培养基与激素组合,并且可同时实现芽增殖;生根培养基为WPM+1.0 mg/L IBA.     

High-frequency Induction of Adventitious Shoots from Leaves of Robinia pseudoacacia by Thidiazuron

INTRODUCTION Black locust (Robinia pseudoacacia L.) is a nitrogen- fixing leguminous tree valuable for its agroforestry qualities (ornamental value, timber production, animal feed, and honey production). Moreover, its fast growing rate and potential for environmental amelioration have drawn attention to the species as one of the leading candidates for woody biomass plantations (Mitchell C P, 1988; Ranney J W, et al, 1988). The amenability of black locust to be regenerated by tissue cul…     

狗枣猕猴桃叶片离体培养的器官、体细胞胚形成与植株再生(英文)

以狗枣猕猴桃试管苗的叶片为外植体,接种于含3%蔗糖和0.2%Gelrite的BW培养基上,外加2,4-D(0,0.1,1和10μmol/L)与玉米素(0,1和10μmol/L)的12种激素组合,置于25℃,光周期为16/8h,光照强度为4000lx的条件下培养。在含1或10μmol/L2,4-D与1或10μmol/L玉米素组合的BW培养基上,产生了体细胞胚,并分化出小植株。随着玉米素浓度的增加,每个外植体上的胚再生频率和体细胞胚的数量也随之增加。同时以叶片为外植体产生的狗枣猕猴桃试管苗的愈伤组织表层产生了不定芽,并抽长成枝。发枝率随着玉米素浓度的增加而增加,并受高浓度的2,4-D所抑制。枝芽转接到含1μmol/LNAA的BW培养基上生根,长成小植株。