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Title: White-core endosperm floury endosperm-4 in rice is generated by knockout mutations in the C-type pyruvate orthophosphate dikinase gene ( OsPPDKB ) .
Author: Kang HG Park S Matsuoka M An G
Journal: Plant J Citation: V : 42 ( 6 ) P : 901-11 Year: 2005 Type: ARTICLE
Literature: oryza Field: abstract Doc ID: pub15941402 Accession (PMID): 15941402
Abstract: We have isolated a floury endosperm-4 ( flo4 ) rice mutant with a floury-white endosperm but a normal outer portion . Scanning electron microscopic analysis revealed that this abnormal endosperm consisted of loosely packed starch granules . The mutant phenotype was generated by T-DNA insertion into the fifth intron of the OsPPDKB gene encoding pyruvate orthophosphate dikinase ( PPDK ) . Plants containing flo4-1 produced no OsPPDKB transcript or the OsPPDKB protein in their developing kernels and leaves . We obtained two additional alleles , flo4-2 and flo4-3 , that also showed the same white-core endosperm phenotype . The flo4 kernels weighed about 6% less than wild-type ones . Starch contents in both kernel types were similar , but the total protein content was slightly higher in the mutant kernels . Moreover , lipid contents were significantly increased in the flo4 kernels . Expression analyses demonstrated that the cytosolic mRNA of OsPPDKB was induced in the reproductive organs after pollination , and greatly increased until about 10 days after fertilization . This mRNA was localized mainly in the endosperm , aleurone , and scutellum of the developing kernel . Our results suggest that cytosolic PPDK functions in rice to modulate carbon metabolism during grain filling .
Matching Sentences:
[ Sen. 5, subscore: 2.00 ]: We obtained two additional alleles , flo4-2 and flo4-3 , that also showed the same white-core endosperm phenotype .
[ Sen. 1, subscore: 1.00 ]: We have isolated a floury endosperm-4 ( flo4 ) rice mutant with a floury-white endosperm but a normal outer portion .
[ Sen. 4, subscore: 1.00 ]: Plants containing flo4-1 produced no OsPPDKB transcript or the OsPPDKB protein in their developing kernels and leaves .
[ Sen. 6, subscore: 1.00 ]: The flo4 kernels weighed about 6% less than wild-type ones .
[ Sen. 8, subscore: 1.00 ]: Moreover , lipid contents were significantly increased in the flo4 kernels .
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