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Title: Expression patterns of genes encoding carbohydrate-metabolizing enzymes and their relationship to grain filling in rice ( Oryza sativa L ) : comparison of caryopses located at different positions in a panicle .
Author: Ishimaru T Hirose T Matsuda T Goto A Takahashi K Sasaki H Terao T Ishii R Ohsugi R Yamagishi T
Journal: Plant Cell Physiol . Citation: V : 46 ( 4 ) P : 620-8 Year: 2005 Type: ARTICLE
Literature: oryza Field: abstract Doc ID: pub15701658 Accession (PMID): 15701658
Abstract: In rice , caryopses located at the base of the panicle have a lower growth rate than those at the tip of the panicle . The former and latter types of caryopses are called inferior and superior caryopses , respectively . Taking the different growth rate into consideration , sugar status and the expression of genes encoding carbohydrate-metabolizing enzymes in inferior caryopses were compared with those in superior caryopses . During the first 5 d after flowering , superior caryopses elongated rapidly , but inferior caryopses did not . At this phase , inferior caryopses had a low ratio of hexose to sucrose , high activity of acid invertase and the absence of the expression of the genes encoding the above enzymes except for two isoforms of cell wall invertase , OsCIN4 and INV1 , in comparison with superior caryopses . At the start of caryopsis elongation in both superior and inferior caryopses , the hexose/sucrose ratio increased accompanied by gene expression of vacuolar invertase ( INV3 ) , sucrose synthase ( RSus1 ) and ADP-glucose pyrophosphorylase ( AGP-L2 : D50317 ) . Furthermore , the genes related to endospermal starch accumulation were expressed highly with the decrease in the hexose/sucrose ratio after its peak . Based on the comparison of superior and inferior caryopses , the possible mechanism of grain filling in rice is discussed .
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[ Sen. 5, subscore: 1.00 ]: At this phase , inferior caryopses had a low ratio of hexose to sucrose , high activity of acid invertase and the absence of the expression of the genes encoding the above enzymes except for two isoforms of cell wall invertase , OsCIN4 and INV1 , in comparison with superior caryopses .
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