**7.3. Plant lncRNAs in photomorphogenesis**

Most of the plant growth and developmental processes are regulated by different climatic factors among them light is one of the most important factor [88]. The role of lncRNA in the regulation of photomorphogenesis is still an interesting area of research because most of the identified regulatory molecules are proteins. In *A. thaliana*, several light responsive lncRNAs have been identified associated with histone modifications [89]. Identification and functional characterization of *HIDDEN TREASURE 1* (*HID1*), a novel lncRNA, involved in photomorphogenesis have been accomplished [89]. It may control the process of photomor phogenesis by regulating the expression of PHYTOCHROME INTERACTING FACTOR 3 (PIF3), a transcription factor involved in light response [89]. It could negatively regulate the expression of *PIF3* gene by binding to its promoter directly or in association with chromatin [89]. The occurrence of *HID1* homologs has been described in other plant species exhibiting conserved functions. The findings also shed light on the involvement of other ncRNAs in light responses.
