... Laboratory,La Jolla, CA, USA). One-month-old plants were grownunder a 16-h light ⁄ 8-h dark photoperiod at 22 °C with coolwhite light (120 mmolÆphotonsÆm)2Æs)1), and used for trans-formation. ... technique. Takentogether, these results provide information for the functional analysis ofplant DEVH box RNA helicases, and suggest that AtHELPS, as an impor-tant negative regulator, plays a role ... building resis-tance to abiotic stress during plant growth and devel-opment. For plant DExH box helicase, however,Arabidopsis CAF ⁄ DICER-LIKE 1 has been shown to be critical for the biogenesis...