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Oligoarray analysis of semi-global gene expression in ripening Japanese pear fruit

ABSTRACT: A custom oligoarray of Japanese pear (Pyrus pyrifolia) based on 9,812 independent ESTs from different tissues (fruits at various growth stages, vegetative and flower tissues) was designed and used for comprehensive investigation of gene expression before and during ripening (105 to 147 days after full bloom).

ORGANISM(S): Pyrus pyrifolia

PROVIDER: GSE18682 | GEO | 2010/10/12

SECONDARY ACCESSION(S): PRJNA121561

REPOSITORIES: GEO

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Oligoarray analysis of semi-global gene expression in ripening Japanese pear fruit

Project description:A custom oligoarray of Japanese pear (Pyrus pyrifolia) based on 9,812 independent ESTs from different tissues (fruits at various growth stages, vegetative and flower tissues) was designed and used for comprehensive investigation of gene expression before and during ripening (105 to 147 days after full bloom). Gene expression in fruit development of Japanese pear was measured from 105 to 147 days after full bloom (DAFB). 147 DAFB is the optimum maturity for eating. Two to three independent experiments were performed at each time (105 to 147 DAFB) using different trees for each experiment.

2010-10-12 | E-GEOD-18682 | biostudies-arrayexpress

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Comparison of pear M-bM-^@M-^XLa FranceM-bM-^@M-^Y and its bud mutant M-bM-^@M-^XGiant LafM-bM-^@M-^Y (2010 expt, receptacle at 1 week before full bloom stage)

Project description:Bud mutation (bud sport) is mutation occurred in one branch in a tree and the mutant branch shows different phenotype from normal branches. Because bud mutation occurs in a part of plant body, genomic backgrounds of mutant branch and normal branches are the same, except some mutations. Therefore bud mutants are ideal material to identify key genes for important traits of crops. We studied M-bM-^@M-^XGiant LafM-bM-^@M-^Y, a bud mutant setting large fruit, which generated spontaneously in European pear M-bM-^@M-^XLa FranceM-bM-^@M-^Y tree. In M-bM-^@M-^XGiant LafM-bM-^@M-^Y, increase of cell size and DNA reduplication occurred specifically in fruit flesh. The DNA reduplication in M-bM-^@M-^XGiant LafM-bM-^@M-^Y was observed at 1 week before full bloom stage. This suggested that DNA reduplication observed in M-bM-^@M-^XGiant LafM-bM-^@M-^Y fruit is not endoreduplication, but endomitosis or nuclear fusion. To identify genes expressed differentially between in M-bM-^@M-^XGiant LafM-bM-^@M-^Y and in M-bM-^@M-^XLa FranceM-bM-^@M-^Y, microarray analysis was performed with RNA from receptacle (fruit flesh) at 1 week before full bloom stage. To isolate the receptacle, laser microdissection was applied. Genes encoding proteins localized in nucleus and cytoskeleton were up-regulated in M-bM-^@M-^XGiant LafM-bM-^@M-^Y. Among these genes, we found several genes which shared homology with previously described DNA reduplication related genes. These are candidates of responsible gene of M-bM-^@M-^XGiant LafM-bM-^@M-^Y mutation. The gene expression profiles between European pear (Pyrus communis) M-bM-^@M-^XLa FranceM-bM-^@M-^Y and its bud mutant M-bM-^@M-^XGiant LafM-bM-^@M-^Y were compared. RNA was extracted from receptacle which was isolated from flower bud at 1 week before full bloom stage by using laser microdissection. Three biological replications were analyzed.

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