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农杆菌介导含硫氨基酸γ-zein转化菊苣的初步研究

2016-01-28张玉白史且李聪

草业学报 2015年9期

张玉,白史且,李聪

(1.四川省草原科学研究院,四川 成都611731;2.中国农业科学院北京畜牧兽医研究所,北京 100094)

农杆菌介导含硫氨基酸γ-zein转化菊苣的初步研究

张玉1*,白史且1,李聪2

(1.四川省草原科学研究院,四川 成都611731;2.中国农业科学院北京畜牧兽医研究所,北京 100094)

摘要:含硫氨基酸具有动物营养与免疫相关的重要生理功能,为提高菊苣中含硫氨基酸含量,采用根癌农杆菌介导法将玉米种子贮藏蛋白含硫氨基酸基因γ-zein和绿色荧光蛋白GFP融合基因转入到菊苣无菌苗叶片中,经过共培养、潮霉素抗性筛选、分化、再生和炼苗, 得到抗性植株。对抗性植株进行PCR、PCR-Southern、斑点杂交和RT-PCR分析,结果表明,外源目的基因已经整合到菊苣基因组中并且得到了表达,为提高菊苣含硫氨基酸含量,改善其品质奠定了基础。

关键词:γ-zein基因;菊苣;农杆菌转化;含硫氨基酸

Preliminary studies on transgenic chicory using the sulphur-amino acid gene, γ-zein, mediated byAgrobacteriumtumefacien

ZHANG Yu1*, BAI Shi-Qie1, LI Cong2

1.SichuanGrasslandScienceAcadem,Chengdu611731,China; 2.InstituteofAnimalScience,ChineseAcademyofAgriculturalScience,Beijing100094,China

Abstract:Sulfur-containing amino acids have important physiological functions related to animal nutrition and immunity. To improve the sulfur-amino acid content of chicory, leaves of chicory were transformed with the Sulphur-amino acid gene γ-zein, an important prolamin storage protein from Zea mays and a green fluorescent protein (GFP) gene using Agrobacterium mediated transfusion. After co-culture, selective differentiation and regeneration, hygromycin resistant plants were obtained. Resistant plants were detected using PCR, PCR-southern, dot blot hybridization and RT-PCR. The results demonstrated that the γ-zein genes had been integrated into the genome of chicory and expressed on a nucleic acid level in the transgenic plants.

Key words:γ-zein genes; chicory (Cichorium intybus); agrobacterium-mediated transformation; sulphur-amino acid

蛋白短缺包括蛋白含量短缺和营养品质低下,是21世纪全球性的严重问题,在尽快提高作物品种的蛋白质含量的同时,积极改善蛋白质的氨基酸组成,提高营养价值,具有重要意义。

含硫氨基酸如甲硫氨酸(也称为蛋氨酸,methionine,Met)、胱氨酸、半胱氨酸(cysteine, Cys)等是合成蛋白质的重要氨基酸,蛋白质中含硫氨基酸的含量与种子萌发、生长和作物品质均有密切关系。含硫氨基酸是人体必需氨基酸之一,也是形成动物毛发角蛋白的必需组分,并且研究表明含硫氨基酸含量的增加可提高羊毛产量22%以上,增产的幅度在22%~104%[1-2],同时还可增加牲畜的重量,含硫氨基酸的这种独特作用是别的氨基酸不具有的[2]。……

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