Silicon mediates sodium transport and partitioning in maize under moderate salt stress

摘要: Abstract Silicon (Si) is known to alleviate salt stress in various crops; however, the influence of Si on sodium (Na) transport and partitioning at tissue, cell organelle levels poorly understood. Maize (Zea mays L.) hybrid sensitive was exposed moderate (40 mM NaCl; simulating conditions salinized agricultural soils) without or with supply 1.5 mM Si(OH)4. We investigated expression SOS genes encoding Na+ efflux transporter root tissues maize, paralleled by measurements tissue Na concentration. In addition, subcellular localization (using fluorescent dye) within leaf mesophyll cells also performed. supplied plants accumulate less both apex cortex, but allocate more leaves via xylem. This accompanied increased ZmSOS1 ZmSOS2 cortex facilitating exclusion, stele for enhanced loading into Also, down-regulated ZmHKT1 stele, which further decreased unloading from Consequently, accumulation leaves, enhances sequestration vacuoles thereby decreasing chloroplasts. response shifts typical glycophyte behavior this species towards that halophytes.