**3. Discussion**

Plants exposed to HT exhibit reduced growth and development, as well as changes in signaling cascades or gene expression, representing adaptive responses to HT [27]. Global climate change has prompted breeders to develop thermotolerant crop varieties, including vegetable crops. Identifying genes that regulate plant responses to warming (or HT adaptation) and elucidating the mechanisms underlying their functions will be crucial for coping with the effects of global warming on agriculture. To identify and characterize warming-associated genes from Chinese cabbage, we subjected Chiifu and Kenshin, two contrasting inbred lines with respect to geographic origin and temperature responsiveness, to transcriptome analysis with a newly developed 30 -tiling microarray (135 K) covering the whole *Brassica rapa* genome using newly designed temperature treatments. Although the warming condition is different from the heat stress, some of HSR genes like *sHSP*s showed similar upregulated patterns as described in previous work [17]. However, this analysis yielded several novel findings, including the discovery of putative HT-adaptive genes, alternative splicing of *BrHSFA2*, and the expression patterns of its target genes.
