Prediction,Evolution and Expression Analysis of Reverse Transcriptase of LTR Retrotransposons in Pear Prediction,Evolution and Expression Analysis of Reverse Transcriptase of LTR Retrotransposons in Pear Effect of ABA on transcriptionally active Ty1-copia retrotransposons in Dendrobium officinale Isolation and Characterization of RNaseH-LTR Sequences of Ty1-copia Like Retrotransposons in Oriental Persimmon (Diospyros kaki Thunb. ‘Luotian-tianshi‘) Cloning and Analysis of Reverse Transcriptase of Ty1-copia Retrotrans- posons in Hylocereus undatus Cloning and Analysis of Reverse Transcriptase of Ty1-copia Retrotrans- posons in Hylocereus undatus Cloning and analysis of reverse transcriptase(RT) of Ty1-copia retrotransposons in Dendrobium officinale The Cloning and Analysis of Reverse Transcriptase of Ty1-copia-like Retrotransposons in Cucumis The Cloning and Analysis of Reverse Transcriptase of Ty1-copia-like Retrotransposons in Cucumis Isolation and Characterization of RNaseH-LTR Sequences of Ty1-copia Like Retrotransposons in Oriental Persimmon (Diospyros kaki Thunb. ‘Luotian-tianshi‘)