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Title: Characterization and transcriptional expression of the alpha-expansin gene family in rice .
Author: Shin JH Jeong DH Park MC An G
Journal: Mol . Cells Citation: V : 20 ( 2 ) P : 210-8 Year: 2005 Type: ARTICLE
Literature: oryza Field: abstract Doc ID: pub16267395 Accession (PMID): 16267395
Abstract: The rice genome contains at least 28 EXPA ( alpha-expansin ) genes . We have obtained near full-length cDNAs from the previously uncharacterized genes . Analysis of these newly identified clones together with the 12 identified earlier showed that the EXPA genes contain up to two introns and encode proteins of 240 to 291 amino acid residues . The EXPA proteins contain three conserved motifs : eight cysteine residues at the N-terminus , four tryptophan residues at the C-terminus , and a histidine-phenylalanine-aspartate motif in the central region . EXPA proteins could be divided into six groups based on their sequence similarity . Most were strongly induced in two-day-old seedlings and in the roots of one-week-old plants . However , only 14 genes were expressed in the aboveground organs , and their patterns were quite diverse . Transcript levels of EXPA7 , 14 , 15 , 18 , 21 , and 29 were greater in stems , while EXPA2 , 4 , 5 , 6 , and 16 were highly expressed in both stem and sheath but not in leaf blade . EXPA1 is leaf blade-preferential , and EXP9 is leaf sheath-preferential Most of the root-expressed genes were more strongly expressed in the dividing zone . However , the Group 2 EXPA genes were also strongly expressed in both mature and dividing zones , while EXPA9 was preferentially expressed in the elongation zone . Fourteen EXPA genes were expressed in developing panicles , with some being expressed during most developmental stages , others only as the panicles matured . These diverse expression patterns of EXPA genes suggest that in general they have distinct roles in plant growth and development .
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[ Sen. 8, subscore: 1.00 ]: Transcript levels of EXPA7 , 14 , 15 , 18 , 21 , and 29 were greater in stems , while EXPA2 , 4 , 5 , 6 , and 16 were highly expressed in both stem and sheath but not in leaf blade .
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