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A prickle is an acuminate protuberance formed by the deformation of plant   trichomes together with a few cortical cells. It is a type of multicellular   eglandular trichome with special morphology, which originates from the   phloem but is not connected to the xylem. Rosa rugosa is an important   ornamental/commercial plant and an important raw material in the food and   perfume industries. However, the firm prickles on its stems are inconvenient   to field management, the harvesting of flowers and garden management. The   TTG1 transcription factor related to the development of prickle was isolated   from R. rugosa in the present study. Its expression patterns in different   tissues and varieties were analyzed. Results showed the expression level of   the RrTTG1 gene was highest in the leaves, followed by the stems, but was   lower in the pericarps and petals. Moreover, the higher expression level of   the RrTTG1 gene in all tissues of the ‘Ciguo rose’, as compared with that of   the ‘Weihai wild rose’, follows the results of field morphological   observation. Therefore, the RrTTG1 transcription factor is likely to   regulate the development of rose prickles. This study allows for further   discussion on the molecular mechanisms of prickle formation and development   in R. rugosa and provides a molecular basis for the cultivation of roses   with fewer or no prickles via genetic engineering

Cloning and expression analysis of transcription factor RrTTG1 related to prickle development in rose (Rosa Rugosa)