植物的生長和發育與外界的環境變化有極大的密切關係，像是乾旱、鹽害和低溫逆境。而低溫逆境影響蝴蝶蘭生長，降低產值，因此我們希望利用台灣原生種蝴蝶蘭Phalaenopsis aphrodite subsp. formosana對寒冷的高耐受度，分析低溫誘發基因的可能功能。從實驗室以PCR-select subtraction的方法構築之EST基因庫，選殖分析132個可能受低溫逆境誘發的基因片段。其預測蛋白質功能可分類為抗病蟲害/防禦、能量調節、代謝調節、蛋白質運送及儲存、蛋白質修飾、蛋白質合成、訊息傳遞、蛋白質結構、轉錄調控、運送等。以DNA墨點法篩選低溫誘導和低溫抑制的基因，選11個EST進行北方印跡法來分析這些基因的表現，探討其生理意義。我們認為WRKY、DAD1和MYB可能和低溫逆境有密切關係，分析這些基因間的作用或許可提供我們了解低溫逆境訊息傳遞路徑下的重要訊息。

Plant productivity is greatly affected by environmental stresses such as drought, salt loading, and freezing. We attempted to study the cold-induced genes and their possible function using Phalaenopsis aphrodite subsp. formosana which is relatively tolerant to cold stress. One hundred thirty-two ESTs were selected from a previously constructed library based on PCR-select subtraction with low temperature and analyzed. Sequence analyses for the predicted functions of deduced proteins suggested that they can be grouped into categories of disease/defense, energy, metabolism, protein destination, storage, protein modification, protein synthesis, signal transduction, structural protein and transcriptional control. DNA dot blots were used to reexamine the up-regulated and down-regulated ESTs selected from cold stress. Ten genes with significantly differential expression were selected for Northern bolt analysis. Three cold responsive genes were characterized, including the WRKY、MYB transcription factors and defender against cell death 1 (DAD1). The study of these genes might be important for understanding the interactions underlying cold stress signaling pathway

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