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| Title: Alien genes introgression and development of monosomic alien addition lines from Oryza latifolia Desv . to rice , Oryza sativa L | | Author: Multani DS Khush GS delos Reyes BG Brar DS .
| | Journal: Theor . Appl . Genet . Citation: V : 107 ( 3 ) P : 395-405 Year: 2003 Type: ARTICLE | | Literature: oryza Field: abstract Doc ID: pub12764581 Accession (PMID): 12764581 | | Abstract: Oryza latifolia , a tetraploid wild relative of cultivated rice is an important source of resistance to bacterial blight ( BB ) , the brown planthopper ( BPH ) and the whitebacked planthopper ( WBPH ) .
Interspecific hybrids were obtained between an elite breeding line ( IR31917-45-3-2 ) of Oryza sativa ( 2n=24 AA ) and O latifolia Acc .
No 100914 ( 2n=48 CCDD ) .
The crossability in F1 was 7 . 58% and it ranged from 0 . 11 to 0 . 62 in backcross generations .
The F1 hybrid showed 2-6 II , 0-2 III , 0-1 IV and 22-32 I ; the mean being 3 . 92 II + 0 . 11 III + 0 . 02 IV + 27 . 30 I per cell at diakinesis .
Monosomic alien addition lines ( MAALs ) having a 2n chromosome complement of O sativa and one chromosome of O latifolia were characterized based on morphology and isozyme banding pattern .
The MAALs were designated as MAAL-1 , MAAL-2 , MAAL-4 , MAAL-5 , MAAL-6 , MAAL-7 , MAAL-8 , MAAL-9 , MAAL-10 , MAAL-11 and MAAL-12 .
The female transmission rates of the alien chromosome varied from 4 . 4 to 35 . 5% , whereas 8 of the 11 MAALs transmitted the alien chromosome through the male gamete , the range being 1 . 7% ( MAAL 10 ) to 11 . 9% ( MAAL 12 ) .
Disomic progenies in BC3 and BC4 generations had complete resemblance to the O sativa parent .
Of the 2 , 295 disomic BC3F3 progenies , 309 showed introgression for resistance to BPH and 188 each for WBPH and BB resistance .
Four plant progenies which were resistant to both BPH and WBPH were also resistant to BB race 2 of the Philippines .
Nine of the 34 BC3F1 plants showed introgression for ten allozymes of O latifolia , such as Est5 , Amp1 , Pgi1 , Mdh3 , Pgi2 , Amp3 , Pgd2 , Est9 , Amp2 and Sdh1 , located on 8 of the 12 chromosomes .
Alien introgression was also detected for morphological traits such as long awns , earliness , black hull , purple stigma and apiculus .
Abnormal plants with many wild-species traits suddenly appeared in normal disomic progenies .
These plants showing instability and abnormal segregation behaviour are being investigated for the activation of transposons . | Matching Sentences:
[ Sen. 12, subscore: 1.00 ]: Nine of the 34 BC3F1 plants showed introgression for ten allozymes of O latifolia , such as Est5 , Amp1 , Pgi1 , Mdh3 , Pgi2 , Amp3 , Pgd2 , Est9 , Amp2 and Sdh1 , located on 8 of the 12 chromosomes .
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