摘要
畜牧业是黑龙江省的半壁江山,进行饲草改良和提高饲料作物的吸收率是当前发展
畜牧业亟需解决的问题。玉米是重要的饲用作物,在畜牧业中占有支柱地位。但由于其
中含有大量的纤维素,影响了草食性动物对它的消化率和吸收率。迄今,为提高对纤维
的消化率和吸收率,将纤维素酶作为添加剂应用于饲料工业,取得了一定成就,但仍存
在着诸多问题,如纤维素酶的生产菌株产酶量低、酶制剂在加工过程中易失活、酶制剂
的成本较高等。
低温、干旱、盐碱等逆境条件严重制约着黑龙江省的农业生产,仅盐碱地就达9000万
亩,培育出耐低温、干旱、盐碱的饲草作物,可充分利用我省的耕地资源,对我省的畜牧
业发展将会起到重大作用。因此,培育耐低温、干旱、盐碱以及高消化率的转基因饲料作
物,可创造巨大的经济和社会效益。
本研究的目的是系统探讨提高玉米再生效率的主要因子,建立稳定的玉米植株再生
体系;克隆β-1,4-内切葡聚糖苷酶基因(EGV)并将其构建在含有对抗渗透胁迫基因起
调控作用的转录因子—DREB1A基因的植物表达载体上,利用农杆菌介导法将编码纤维
素酶的基因和DREB1A基因联合导入玉米中,为培育耐低温、干旱、盐碱的高消化率的
饲用玉米新品种(系)奠定基础。主要研究结果如下:
1.基因克隆
利用PCR方法,用GenBank上1994年注册的β-1,4-内切葡聚糖苷酶基因的特异性引
物,从里氏木霉的基因组DNA中克隆了β-1,4-内切葡聚糖苷酶基因。序列分析结果表明,
该序列与GenBank上的核苷酸序列同源性达100%,氨基酸序列同源性达100%。
2.载体构建
构建了双价植物表达载体pAEG29A。pAEG29A带有玉米组成型启动子Ubi调控的β
-1,4-内切葡聚糖苷酶基因和诱导型启动子rd29A调控的DREB1A基因。植物筛选标记为
bar基因。
3.玉米再生体系建立
(1)影响Ⅱ型愈伤组织诱导的4个主要因素的主次顺序是:2,4-D>BA>水解酪蛋白>
L-脯氨酸。试验较优组合为:MS培养基添加4mg/L 2,4-D、750mg/L L-脯氨酸、
250mg/L水解酪蛋白。
(2)确定了最佳Ⅱ型愈伤组织诱导培养基为:MS+4mg/L 2,4-D+750mg/l L-脯氨酸
+250mg/L水解酪蛋白+250mg/L谷氨酰胺+10mg/L AgNO_3,30g/L蔗糖,0.8%琼
东北农业大学理学硕l一学位论文
月台,PHS.8。
(3)确定了继代培养基为:N6+Zmg几2,4一D+5 00mg几L一脯氨酸十250m留L水解酪蛋白,
309几蔗糖,0.8%琼脂,pHS.8。适当地降低2,4一D的浓度为了保持愈伤组织胚性的
同时,不影响不定芽的分化。
(4)不同基因型的不定芽分化率和每个外植体出芽数不同。在供试的3个基因型中,甜
1、龙抗11和东8112的最高不定芽分化率分别为93.14%、77.65%、51.76%,每个
外植体出芽数分别为1.35、1.20、1.08。
(5)确定了各基因型的不定芽分化培养基。甜l的分化培养基为Ms+Zm岁L BA十0.5m留L
NAA,309几蔗糖,0.8%琼脂,pHS.8。龙抗11的分化培养基为Ms十0.2m留L
BA巧00m留L水解酪蛋白,30叭蔗糖,0.8%琼脂,pHS.8。东8112的分化培养基
为Ms+ZmgzL BA+02mg/LZ,4一D,30叭蔗糖,0.8%琼脂,pHS.8。
(6)确定了生根培养基为:MS+1m醉NAA十0.25m妙BA+0.1%活性炭,30留L蔗糖,
0.8%琼脂,pHS.8。
4.农杆菌介导的遗传转化
确定不定芽分化阶段双丙氨磷的选择压力:甜l为l.25m留L,东8112为1.om以L,
龙抗l一为1.omg/L。
5.转基因植株的分子检测
经PCR检测,获得EGv基因及DREB IA基因同时为阳性的植株5株。转化频率为
3 1 .25%。
Stock raising plays a very important role in Heilongjiang Province. Meliorating grazing and improving absorption rate of feedstuff are urgent problems at present in stock raising. Maize as an important feedstuff is of vital concernment in stock raising. Because of its large quantity of cellulose, the digestion rate and absorption rate are seriously affected. Using cellulase as an additive in feedstuff has resolved the problem in certain way but there are still some questions such as low production, instability and high cost of the production.
In addition, drought, high salt and low temperature stress also lead to reduction of crop production. There is about 6,000,000 hectares salt alkaline soil in Heilongjiang Province. Cultivating the feedstuff plants with drought, salt and temperature resistance can make good use of tilth of our province, and will play an important role in developing our stockbreeding. Therefore, fostering transgenic feedstuff crops with high digestion rate and resistance to low temperature, drought, salt can make tremendous economical and social benefit.
In this research, the regeneration system of Maize has been established. The main factors affecting maize regeneration are analyzed. Endo-l,4-beta-glucanase V(EGV) gene is cloned and had been constructed into the plant expression vector which contain a transcription factor DREB1A. DREB1A is a transcription factor that can regulate several genes involved in stress reaction. Both of the two genes were transformed into Maize mediated by Agrobacterium. The research work will help to breed the new maize with high drought, salt and low temperature resistance and high maize feedstuff absorption rate.
The main results were summarized as follows.
1. Gene clone
According to the EGV gene sequence in GenBank in 1994, a pair of specific primers was designed, and the EGV gene was cloned from genome DNA of Trichoderma reesei by PCR method. The result of sequence analysis indicated that this fragment showed 100% identity in nucleotide and 100% in amino acid to the previously reported one.
2. Vector construction
Bivalent expression vector pAEG29A was constructed, on which EGV gene was regulated by the constitutive promoter Ubi of maize. DREB1A gene was regulated by the rd29A and bar gene as selectable marker.
3. Establishment of Maize regeneration system
(1) The order of four main factors on affecting callus tissue type II is: 2, 4-D > BA > L-Pro > CH. The best combination is: MS medium adding 4mg/L 2.4-D, 750mg/L L-Pro and 250mg/LCH.
(2) Establishing the optimization induction medium of callus tissue II: MS+4mg/L 2.4-D+750mg/L L-Pro+250mg/LCH+250mg/L L-Glu+1 Omg/L AgNO3,30g/L sucrose, 0.8%agar. pH5.8
(3) Establishing Callus subculture medium : N6 + 2mg/L 2,4-D+ 0.25mg/L BA+ 750mg/L L-Pro+ 250mg/L CH,30g/L sucrose, 0.8% agar, pH5.8. Properly decreasing concentration of 2,4-D to keep the embryonic character of callus tissue and at the same time differentiation of adventitious buds is not affected.
(4) Differentiation rate of adventitious buds and average number of buds from each explants are different among different genotypes. For the three genotypes Tianl, Longkang and Dong8112, differentiation rate of adventitious buds are 89.97%, 74.92% and 38.53% respectively, average number of buds from each explant are 1.13, 1.02 and 0.69 respectively.
(5) Establishing adventitious buds differentiation medium of every genotypes. Composition of differentiation medium of Tianl is MS+2mg/L BA+0.5mg/L NAA, 30g/L sucrose., 0.8% agar, pH5.8. That of Longkangll is MS+0.2mg/L BA+500mg/L CH, 30g/L sucrose., 0.8% agar, pH5.8. That of Dong 8112 is MS+2mg/L BA+0.2mg/L 2,4-D,30g/L sucrose, 0.8% agar, pH5.8.
(6) Establishing the optimization medium of root generation: MS+1mg/L NAA+ 0.25mg/L BA+0.1% active carbon+30g/L sucrose, 0.8% agar, pH5.8.
4. Transformation into Maize by Agrobacterium-medium method
Establishing Bialaphos selection pressure in the stage of callus differentiation: Tianl is 1.25 mg/L
引文
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