536 / 2019-03-11 15:25:18

The mobile signaling in drought stress responses and resistance

drought stress,abscisic acid,peptide,long-distance communications

全体主题 > Abiotic Stress

Land plants regulate the dehydration stress responses with the complex regulatory signaling networks including the detection of water deficit signals. Plants recognize water deficit conditions at their roots and transmit this signal to their shoots to synthesize abscisic acid (ABA) in their leaves. ABA is a key phytohormone that regulates physiological and molecular responses to dehydration stress, such as stomatal closure and genes expressions. However, no mobile signaling molecules have yet been identified that can mediate root-to-shoot cellular communication and trigger ABA accumulation in leaves in response to dehydration stress. Recently, we showed that the CLAVATA3/EMBRYO-SURROUNDING REGION-related 25 (CLE25) peptide transmits water-deficit signals through vascular tissues in Arabidopsis. The CLE25 gene is expressed in vascular tissues and enhanced in roots in response to dehydration stress. The root-derived CLE25 peptide moves from the roots to leaves. BARELY ANY MERISTEM (BAM) receptors perceived CLE25 signal in leaves. The CLE25–BAMs mediate ABA accumulation and induce stomatal closure, thereby enhancing resistance to dehydration stress. Thus, CLE25–BAMs is thought as one of mobile molecules of long-distance signaling in dehydration response. We discuss the current knowledge of plant molecules involved in long-distance signaling for stress response with special focus on mobile peptides.