*4.1. Plant Materials and Treatments*

Moso bamboo seeds were harvested from Guilin in the Guangxi Zhuang Autonomous Region, China. Seedlings were grown in an illumination incubator under long-day conditions (16 h light/8 h dark) at day/night temperatures of 25/18 ◦C, and watered with Hoagland nutrient solution. For drought and salt stress, the seedlings were watered with 50% Hoagland's solution with 20% polyethylene glycol 6000 (PEG 6000) and 250 mM NaCl. For low temperature treatment, the plants were transferred to a growth chamber at 4 ◦C, and plant leaf, stem, and root tissues were collected [46]. For abscisic acid (ABA) and gibberellin A3 (GA3) treatments, the seedlings were watered with 200 µM ABA [47] and 200 µM GA<sup>3</sup> solution [48]. To detect the transcriptional level of *PheDof12-1* in photoperiod treatments, leaves were collected for analysis from plants exposed to LD (16 h light/8 h dark) and SD (16 h light/8 h dark) treatments [21]. All samples were immediately frozen in liquid nitrogen and stored at −80 ◦C until further analysis.
