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1.
用不同浓度的和5-氮胞苷溶液配合不同时间处理了发生的在转录水平的转基因cry1Ab沉默水稻。结果表明,5-氮胞苷处理能使8%-30%转基因水稻植株的转基因cry1Ab恢复表达活性,复活性基因表达的Cry1Ab蛋白含量可达0.147%,45mg/L5-氮胞苷处理1d可使转基因cry1Ab的复活率及Cry1Ab蛋白含量达最高。同时,5-氮胞苷处理使转基因水稻植株出现矮化,分蘖数、单株粒重下降,穗长减小及开花期延迟等发育异常现象。5-氮胞苷作为一种弱诱变剂在克服转基因沉默及创造具优良农艺性状的转基因植物中具有一定的应用价值。 相似文献
2.
M.L. Wall H.L. Wheeler M.P. Huebsch J.C. Smith D. Figeys I. Altosaar 《Journal of Cereal Science》2010
The starch granule surface is a frontline of microbial attack and defence, operating in the background of normal starch granule metabolism. Puroindoline, a wheat protein which binds starch granule surfaces, contains a unique tryptophan-rich domain likely responsible for this property, though direct evidence is lacking. To test puroindoline’s tight association, prime starch granule extracts were water-washed 8 or 20 times and residual puroindoline removed using a solution of 50% isopropanol/50 mM NaCl. We found that this solvent was consistent in the amount of protein extracted from wheat flour and washed starch, regardless of initial protein content. Relative quantification of puroindoline following water-washing was performed using dot blot. Washing more than 8 times did not further reduce puroindoline content of starch granules suggesting a strong association with the starch granule surface. To identify the tryptophan-rich domain tightly associated with the starch granule surface, a combination of in situ tryptic digestion and mass spectrometry was used. Following digestion and water-washing, 50% isopropanol/50 mM NaCl was used to remove tightly-associated peptides for identification by mass spectrometry. Using this method, we identified the tryptophan-rich domain of puroindoline directly bound to the starch granule surface of wheat. 相似文献
3.
Commercially Produced Rice and Maize Starches Contain Nonhost Proteins,as Shown by Mass Spectrometry
Adam G. Koziol Benazir K. Marquez Matthew P. Huebsch Jeffrey C. Smith Illimar Altosaar 《Cereal Chemistry》2012,89(5):262-264
To evaluate the presence of contaminating nonhost proteins in commercially prepared rice and maize starch samples, we initiated a direct sequencing mass spectrometric proteomics survey. We discovered nonhost proteins from a variety of species, including Phytophthora cinnamomi, Homarus americanus, and Ovis aries. Our documentation of H. americanus proteins in these starch samples may have food safety implications with regard to shellfish allergies. We hypothesize that these proteins were introduced to the starch samples via process wash water used in the milling and deproteination steps in the commercial preparation of the starches analyzed. The introduction of nonhost proteins during commercial processing of starch samples that are used routinely in analytical studies indicates that these studies are using impure materials. Therefore, further study and documentation of the starch samples is required to ensure that all components of the samples are properly catalogued. 相似文献
4.
Inheritance and field performance of transgenic Korean Bt rice lines resistant to rice yellow stem borer 总被引:1,自引:0,他引:1
Songjin Kim Choljun Kim Wonnam Li Tokyong Kim Yongsu Li Mohsin Abbas Zaidi Illimar Altosaar 《Euphytica》2008,164(3):829-839
Transgenic Korean rice plants containing the cry1Ab gene were developed for resistance against yellow stem borer (Scirpophaga incertulas, YSB). More than 100 independent transgenic lines from three Korean varieties (P-I, P-II and P-III) were generated. The amount
of Cry1Ab in transgenic T0 plants was as high as 2.88% of total soluble proteins. These levels were sufficient to cause 100% mortality of YSB larvae.
The majority of T1 transgenic lines originated from the varieties P-I and P-II followed a Mendelian fashion of segregation. Deviation from the
expected segregation ratio was observed in a small number of the transgenic lines of P-I and P-II origins. However, this deviation
was primarily observed in the P-III originated lines. Segregation analysis of the T1 generation indicated that 1–3 copies of the cry1Ab gene were integrated into the genome of the majority of the transgenic lines originating from varieties P-I and P-II. Stunted
and semi-fertile mutants were observed in some transgenic lines. These aberrations were either independent or closely linked
to the introduced cry1Ab gene loci in different transgenic lines. Reduction in GUS expression levels and loss of toxicity against YSB larvae were
found in some transgenic lines. The transgenic T3 and T4 lines causing 100% mortality of third instar YSB larvae in the lab were completely protected in the field. Analysis of important
yield components on nine selected transgenic lines indicated that stem length, panicle length, grain number per panicle, and
seed setting rates were reduced in transgenic plants compared to those in non-transgenic parental rice lines. Number of panicles
per cluster, however, was significantly higher in transgenic plants. The numerical value of the average yield was in general
greater in the controls than in all the transgenic lines, indicating some ‘yield drag’. Since some selected lines were highly
resistant to the YSB with good yielding potential, they offer effective potential for use in insect resistance management
programs. 相似文献
5.
cry1Ab 基因在转基因"克螟稻"后代中的遗传稳定性及表达 总被引:21,自引:0,他引:21
以不同世代的转基因“克螟稻”后代为实验材料,研究了cry1Ab基因在不同世代间的遗传稳定性及表达特性。结果表明:cry1Ab基因在“克螟稻”后代中不仅能通过有性世代稳定传递而且能在有性世代交替中保持表达的稳定性,同时cry1Ab基因在“克螟稻”后代中表达表现出了一定的时空特性,主茎、一次分蘖和二次分蘖各部位Cry1Ab蛋白含量均不同、但均以茎、叶、叶鞘中表达量较高,根中表达量则相对较低,其中以成熟 相似文献
6.
用不同浓度的5-氮胞苷溶液配合不同时间处理了发生在转录水平的转基因cry1Ab沉默水稻。结果表明,5-氮胞苷处理能使8%~30%转基因水稻植株的转基因cry1Ab恢复表达活性,复活转基因表达的Cry1Ab蛋白含量最高可达0.147%,45mg/L5-氮胞苷处理1d可使转基因cry1Ab的复活率及Cry1Ab蛋白含量达最高。同时,5-氮胞苷处理使转基因水稻植株出现矮化,分蘖数、单株粒重下降,穗长减小及开花期延迟等发育异常现象。5-氮胞苷作为一种弱诱变剂在克服转基因沉默及创造具优良农艺性状的转基因植物中具有一定的应用价值。 相似文献
8.
Agronomic and morphological characterization of Agrobacterium-transformed Bt rice plants 总被引:2,自引:0,他引:2
Qing-yao Shu Hai-rui Cui Gong-yin Ye Dian-xing Wu Ying-wu Xia Ming-wei Gao Illimar Altosaar 《Euphytica》2002,127(3):345-352
The agronomic and morphological characteristics of Agrobacterium-transformed rice plants carrying the synthetic cry1Ab or cry1Ac gene were investigated. Tremendous variations in plant height, seed fertility, grain size and other traits were seen in 80
T1 lines, derived from 80 T0 plants of 9 rice varieties. On average, about 33% T1 lines had either morphological or agronomic variant plants. Most of the variations in T1 plants had no significant correlation with transgene insertion and were proved heritable to their progenies. Genetic analysis
in T3 or T4 generations showed some simple mutations such as chlorophyll deficiency and stunted plants were independent of transgene
insertion and seemed to be controlled by a pair of single genes. However, in two independent transgenic progenies of Xiushui
11, all plants homozygous for transgenes showed dwarfism while all hemizygous and null segregants had normal plant heights.
Two advanced homozygous Bt lines, KMD1 and KMD2, were developed from these two progenies. Comparison of the agronomic traits
of KMD1 and KMD2 with their parent displayed marked differences among them in terms of seedling growth, tillering ability,
yield components and yield potential. The genetic variation observed was generally not linked to the transgene locus and was
ascribed to somaclonal variation, but other causes might also exist in particular cases. The results are discussed in the
context of choosing appropriate transformation methodology for rice breeding programs.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
9.
Bt转基因水稻“克螟稻”杂交后代二化螟抗性研究初报 总被引:14,自引:0,他引:14
利用室内叶片快速鉴定法结合田间抗性调查, 研究了粳型Bt转基因水稻“克螟稻”与籼、 粳稻杂交后代对二化螟(Chilo suppressalis)的抗性。 结果显示, 在与籼稻和粳稻的杂交后代(F1、 F2和BC1)中, 都出现了对二化螟表现高抗的植株。 用离体叶片法测定, 4个组合120株杂种F1和88株GUS阳性(GUS+)BC1株与30株克螟稻亲本相似, 相似文献
10.