Agronomic and morphological characterization of Agrobacterium-transformed Bt rice plants |
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Authors: | Qing-yao Shu Hai-rui Cui Gong-yin Ye Dian-xing Wu Ying-wu Xia Ming-wei Gao Illimar Altosaar |
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Institution: | (1) Institute of Nuclear Agricultural Sciences, Zhejiang University, Hua Jia Chi Campus, Hangzhou, 310029, China;(2) Plant Protection Department, Zhejiang University, Hua Jia Chi Campus, Hangzhou, 310029, China;(3) Department of Biochemistry, Microbiology & Immunology, University of Ottawa, Ottawa, K1N 6N5, Canada |
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Abstract: | 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. |
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Keywords: | Agrobacterium-transformation transgensis somaclonal variation Oryza sativa L |
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