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Gene expression profiling of flower and leaf of Cold-tolerant rice variety Stejaree45

ABSTRACT: To stabilize crop yield under low temperature stress conditions, it is important to improve stress tolerance in crops. Upon exposure to low temperature stress, many genes are induced and their products are thought to function as cellular protectants of stress-induced damages Therefore, responses of global gene expression profiles to cold stress was analyzed at the booting stage using the 60K Rice Whole Genome Microarray.

ORGANISM(S): Oryza sativa

PROVIDER: GSE19389 | GEO | 2010/12/08

SECONDARY ACCESSION(S): PRJNA121747

REPOSITORIES: GEO

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Gene expression profiling of flower and leaf of Cold-tolerant rice variety Stejaree45

Project description:To stabilize crop yield under low temperature stress conditions, it is important to improve stress tolerance in crops. Upon exposure to low temperature stress, many genes are induced and their products are thought to function as cellular protectants of stress-induced damages Therefore, responses of global gene expression profiles to cold stress was analyzed at the booting stage using the 60K Rice Whole Genome Microarray. The cold-tolerant rice variety, Stejaree45 was transplanted in 1/5000 pot at 20 days after seeding. Fertilizers were applied at the rate of 11, 7.7 and 9.3 kg/10a in N, P2O5 The samples were selected at the booting stage of rice on the basis of the auricle distance (the distance between auricles of flag leaf and the previous leaf of the main culm). The plants with an auricle distance ranging from -5 ㎝ to 0 ㎝ were exposed up to the flag leaf auricle using cold water (13℃) for 3 days. Glumous flowers and flag leaves of the cold-resistant variety, Stejaree45, were used to examine gene expression profiles.

2010-12-08 | E-GEOD-19389 | biostudies-arrayexpress

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Project description:The genome-wide transcriptome analyses using microarray probes containing genes and repeat sequences have been performed to examine response to the low-temperature in rice. We have particularly focused on the rice anther at the booting stage, since the low-temperature at this stage resulted in pollen abortion. The results demonstrated that the low-temperature stress caused genome-wide changes of transcriptional activities not only in genes, but also in repeat sequences of the rice anther. The degrees of the temperature responsive changes varied among the rice strains. The five rice strains exposed to the low temperature at 12Â°C for four days, were used for the microarray analyses. RNA was extracted from the anthers one day (C1), three days (C3) and five days (C5: this is one day after completion of the cool treatment) after the cool treatment and non-treated anthers (C0) with three biological replicates.

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Effect of low-Tw treatment before panicle initiation on the chilling response of spikelets at the booting stage in rice.

Project description:In rice (Oryza sativa L.), chilling-induced male sterility increased when plants experienced low water temperature (Tw, 18 M-BM-0C for 14 days) before panicle initiation. The number of mature pollen grains after chilling at the booting stage (12 M-BM-0C for 5 days) was only approximately 45% of total pollen grains in low-Tw plants, whereas it was approximately 71% in normal-Tw plants (Tw not controlled; approximately 23 M-BM-0C under air temperature of 26 M-BM-0C/21 M-BM-0C, day/night). Microarray and quantitative PCR analyses showed that many stress-responsive genes (including OsFKBP65 and genes encoding a large heat shock protein OsHSP90.1, heat shock factors, and many small heat shock proteins) were strongly up-regulated by chilling in normal-Tw spikelets, but were not or rather down-regulated by chilling in low Tw spikelets. OsAPX2 and genes encoding some other antioxidative enzymes were also significantly down-regulated by low Tw in the chilled spikelets. In low-Tw plants, lipid peroxidation products (malondialdehyde equivalents) were significantly increased in the spikelets after chilling, and ascorbate peroxidase activity in the chilled spikelets was significantly lower than that in normal-Tw plants. Our data suggest that an OsFKBP65-related chilling response, which protects proteins from oxidative damage, is indispensable for chilling tolerance but is lost in low-Tw spikelets. Four conditions used: low Tw and chilled, low Tw and not chilled, normal Tw and chilled, normal Tw and not chilled, before panicle initiation and at the booting stage, respectively. Biological replicates: 4 for each treatment.

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Low P stress transcriptome of control rice variety (Dongjin-byeo) and NtPT1-trasngenic rice (PT 1-7-8)

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Effect of low-Tw treatment before panicle initiation on the chilling response of spikelets at the booting stage in rice.

Project description:In rice (Oryza sativa L.), chilling-induced male sterility increased when plants experienced low water temperature (Tw, 18 °C for 14 days) before panicle initiation. The number of mature pollen grains after chilling at the booting stage (12 °C for 5 days) was only approximately 45% of total pollen grains in low-Tw plants, whereas it was approximately 71% in normal-Tw plants (Tw not controlled; approximately 23 °C under air temperature of 26 °C/21 °C, day/night). Microarray and quantitative PCR analyses showed that many stress-responsive genes (including OsFKBP65 and genes encoding a large heat shock protein OsHSP90.1, heat-stress transcription factors, and many small heat shock proteins) were strongly up-regulated by chilling in normal-Tw spikelets, but were not or rather down-regulated by chilling in low Tw spikelets. OsAPX2 and genes encoding some other antioxidative enzymes were also significantly down-regulated by low Tw in the chilled spikelets. In low-Tw plants, lipid peroxidation products (malondialdehyde equivalents) were significantly increased in the spikelets after chilling, and ascorbate peroxidase activity in the chilled spikelets was significantly lower than that in normal-Tw plants. Our data suggest that an OsFKBP65-related chilling response, which protects proteins from oxidative damage, is indispensable for chilling tolerance but is lost in low-Tw spikelets.

2014-12-22 | GSE59221 | GEO

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