Silicon increases cell wall thickening and lignification in rice (Oryza sativa) root tip under excess Fe nutrition

Publication date: Available online 30 September 2019Source: Plant Physiology and BiochemistryAuthor(s): Pooyan Mehrabanjoubani, Ahmad Abdolzadeh, Hamid Reza Sadeghipour, Mahnaz Aghdasi, Mohammad B. Bagherieh‐Najjar, Behrouz BarzegargolchiniAbstractIron (Fe) as a micronutrients and silicon (Si) as a cell wall element are important in plant cell wall extension and integrity. While the interaction of exogenous Si and excess Fe on root cell wall modifications is known, the effects of these nutritional parameters on the spatial changes in the activities of genes and/or enzymes involved in the lignification of root cell walls are not well studied. Thus, these parameters were investigated in the root apical part (AP) and basal part (BP) of rice (Oryza sativa L.) plants supplied with and without Si (1.5 mM) under normal (10 mg/L) and excess Fe (150 mg/L) nutrition for 7 days. Beside growth retardation, excess Fe increased the activities of phenylalanine ammonia lyase (PAL), superoxide dismutase and NADPH–oxidase and PAL and cell wall peroxidase (POD) genes expression, along with the increased phenols and H2O2 contents in the root AP. Furthermore, the increased thickening of endodermal, exodermal and metaxylem cell walls in the root AP by excess Fe was attributed to the enhanced POD activity. POD expression, endodermal and exodermal cell wall thickenings were not affected by excess Fe in the root BP. Si application under excess Fe exaggerated the effects of excess Fe on root...
Source: Plant Physiology and Biochemistry - Category: Biochemistry Source Type: research