Comparative Transcriptome Analysis Reveals Differential Response of Phytohormone Biosynthesis Genes in Glumous Flowers of Cold-Tolerant and Cold-Sensitive Rice Varieties Upon Cold Stress at Booting Stage
2011
Park, M.R., Chonbuk National University, Jeonju, Republic of Korea | Kim, K.Y., National Institute of Crop Science, RDA, Iksan, Republic of Korea | Tyagi, Kuldeep, Chonbuk National University, Jeonju, Republic of Korea | Baek, S.H., National Institute of Crop Science, RDA, Iksan, Republic of Korea | Yun, S.J., Chonbuk National University, Jeonju, Republic of Korea
Low temperature stress is one of the major negative factors affecting vegetative and reproductive growth of rice. To better understand responses of rice plants to low temperature we analyzed transcriptome expression patterns in glumous flower of cold-tolerant japonica rice variety, Stejaree45, and cold-susceptible variety, HR19621-AC6 at booting stage under cold water irrigation. A total of 2,411 probes were differentially expressed by low temperature in glumous flowers of the two varieties. Some important genes involved in hormone biosynthesis showed variety-specific regulation. Expression of GA20ox3 and GA2ox, among the genes involved in GA biosynthesis, was regulated differentially in the two varieties. Among the genes involved in IAA biosynthesis, YUCCA1 and TAA 1:1 showed variety-specific regulation. Among the genes involved in cytokinin biosynthsis and signaling, expression of LOG, HK1 and HK3 was significantly down-regulated only in the cold-susceptible variety. Among the genes involved in ABA biosynthesis, NSY and AAO3 were down-regulated only in the cold-tolerant variety. In general, genes involved in GA, IAA and cytokinin biosynthesis responded to cold temperature in such a way that capacity of those bioactive hormones is maintained at relatively higher levels under cold temperature in the cold-tolerant variety, which can help minimize cold stress imposed to developing reproductive organs in the cold-tolerant variety.
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