24-Epibrassinolide and 2,6-Dichlorobenzonitrile Promoted Celery Petioles and Hypocotyl Elongation by Altering Cellulose Accumulation and Cell Length

BRs (brassinosteroids), an endogenous hormone in plants, regulate cellulose accumulation, cell elongation and plant growth. Propiconazole (PCZ) is effective inhibitor of BR biosynthesis. DCB (2,6-Dichlorobenzonitrile) can inhibit the synthesis affects chemical composition walls. Celery one important leafy vegetable Apiaceae family with rich dietary fiber (including cellulose). The petioles length, leaf blades number content determine yield quality celery. members AgCESAs are related to biosynthesis higher plants. To investigate effects BRs, PCZ on growth celery, celery cv. ‘Jinnan Shiqin’ plants were treated 24-epibrassinolide (24-EBL, most active form BRs), DCB, respectively. results showed that exogenous application up-regulated expression genes accumulated more length applied (1.24 × 10−6 mol/L 24-EBL) increased 2.16 1.37 times control. addition inhibited application. lengths hypocotyl cells longer than Under treatments, levels down-regulated compared control, decreased content, shorter petiole fewer blades. This study provided a reference for functions development