大花金桂子叶胚乳切块培养再生苗的研究_毕业论文

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大花金桂子叶胚乳切块培养再生苗的研究

摘要以桂花品种大花金桂(Osmanthus fragrans‘Dahuajingui’)的子叶切块和胚乳切块为外植体,研究了不同激素水平对桂花子叶切块、胚乳切块愈伤组织诱导的影响。结果表明:外植体子叶切块和胚乳切块在诱导培养基(1/2 MS+0.75mg·L-1 TDZ +0.5mg·L-1 NAA+0.5mg·L-1 2,4-D+0.05% PVP)上的愈伤形成率最高,分别为73.6%和63.9%。培养基中的TDZ和2,4-D浓度的适当配比有利于诱导愈伤组织的形成及生长,在培养基中添加0.05% PVP(聚乙烯吡咯烷酮)可防止愈伤组织长期继代的褐变。随继代次数的增加,子叶切块的愈伤生长状况良好,采用ZT(zeatin)浓度梯度(组1)和TDZ(thidiazuron)浓度梯度(组2)两组实验进行分化。目前ZT浓度梯度实验组已分化出不定芽,最佳分化培养基为1/2 MS+2.0mg·L-1 ZT+0.25mg·L-1 TDZ+0.05%PVP。48142

Abstract Cotyledon and endosperm segments from mature seed of Osmanthus fragrans ‘Dahuajingui’ were used as explants, to study the influence of different hormone levels on cotyledon and endosperm segments inducing callus. The results show that explants cotyledon and endosperm segments cultured in induction medium (1/2 MS+0.75mg·L-1 TDZ+0.5 mg·L-1 NAA+ 0.5 mg·L-1 2,4-D+0.05% PVP) have the highest rate of callus formation, were 73.6% and 63.9% respectively. Increasing TDZ and 2,4-D concentration is conducive to induce callus formation and growth, while medium supplemented with 0.05% PVP (polyvinylpyrrolidone) can prevent long-term callus subculture browning. With the times of subculture, cotyledon segments inducing callus thrives. Design two series of experiments for these callus to differentiation as follows: one (Group One) with different concentration of ZT(zeatin) and with other elements being equal, the other (Group Two) with different concentration of TDZ(thidiazuron) and with other elements being equal. The adventitious bud has differentiation in Group One up to now, the optimum differentiation medium is 1/2 MS+2.0mg·L-1 ZT+0.25mg·L-1 TDZ+0.05% PVP.

毕业论文关键词:大花金桂;子叶切块;胚乳切块;离体培养;不定芽分化;ZT;TDZ

Keyword: Osmanthus fragrans ‘Dahuajingui’; Cotyledon segments; endosperm segments; In vitro culture; adventitious bud differentiation; zeatin; thidiazuron

目    录

1 材料和方法 4

1.1试验材料 4

1.2实验方法 4

1.2.1 外植体处理 4

1.2.2 愈伤组织的诱导和增殖 4

1.2.3 愈伤组织的再分化 5

1.2.4 再生苗的生根 5

2 结果与分析 6

2.1 灭菌时间对外植体染菌率及存活率的影响 6

2.2 不同激素组合对桂花子叶切块愈伤组织诱导的影响 6

2.3 不同激素组合对桂花胚乳切块愈伤组织诱导的影响 7

2.4 ZT浓度对愈伤组织不定芽分化的影响 7

2.5 TDZ浓度对愈伤组织不定芽分化的影响 9

2.6培养基成分对愈伤组织发育以及持续继代过程中产生的外植体褐化的影响……………..9

3 讨论 9

引言

桂花(Osmanthus fragrans Lour.) 即木樨科木樨属木樨,又名九里香、金粟[1],属于我国十大名花,统称桂花。常绿乔木或灌木,花期9-10月上旬。果期翌年3月,果歪斜,椭圆形,呈紫黑色。桂花是一种原产东南亚的灌木,其园艺品种遍及从日本到中国,印度支那,泰国,印度以及高加索地区,是世界上园艺化最早的观赏植物之一,在我国己有2500余年的栽培历史,有着极其丰富的文化内涵,是我国特有的园林树种和香料植物,现各地广泛栽培。花为名贵香料,并作食品香料,亦可作化妆品香料,精油。在园艺栽培上,由于花的色彩不同,有金桂、银桂、丹桂等不同名称。由于它独一无二的气,其提取物在昂贵的香水和化妆品生产用途中有很高的商业需求。在中国,其精油被用于调茶、酒和食物。有关于桂花的研究多集中在国内,国外栽培较少,未进行系统研究。 (责任编辑:qin)