Nanosilver-Promoted Lateral Root Development in Rice is Mediated through Hydrogen Peroxide  

作　　者：Yu-Jyun Chen Xian-Hao Yang Yun-Yang Chao 

机构地区：[1]Department of Plant Industry,National Pingtung University of Science and Technology,Pingtung,912301,Taiwan

出　　处：《Phyton-International Journal of Experimental Botany》2021年第5期1477-1489,共13页国际实验植物学杂志（英文）

摘　　要：Nanosilver(10−9 m)refers to particles comprising 20–15,000 silver atoms,exhibiting high stability and specific surface area.At present,nanosilver has been used in agricultural cultivation and production.This study examined the effects of nanosilver on growth and development of rice root systems.Study results showed that fresh weight of rice belowground organs and root length both increased significantly by 5%and 25%,respectively,after rice radicles were treated with 2 ppm of nanosilver for three days.However,the H_(2)O_(2) level reached its peak at 2 days from treatment,but the activities of the antioxidant enzymes CAT,APX,and GR were inhibited by 2 ppm of nanosilver treatment.The results showed that nanosilver treatment inhibited the antioxidant enzyme activity of rice roots.The treatment of rice radicles with 5μM H_(2)O_(2) promoted root development and the same was observed when nanosilver was used for treatment.Moreover,ascorbic acid(AsA)is a H_(2)O_(2) scavenger and therefore rice root development was inhibited when AsA was added to rice radicles together with either treatment of nanosilver or H_(2)O_(2).In summary,nanosilver treatment of rice radicles promoted root growth and development via the regulation of H_(2)O_(2) and not the O2
−pathway.

关 键 词：RICE NANOSILVER antioxidant enzyme root development H_(2)O_(2) 

分 类 号：S51[农业科学—作物学]