Application of Polygonum minus Extract in Enhancing Drought Tolerance in Maize by Regulating Osmotic and Antioxidant System  

作　　者：Mingzhao Han Susilawati Kasim Zhongming Yang Xi Deng Md Kamal Uddin Noor Baity Saidi Effyanti Mohd Shuib 

机构地区：[1]Department of Land Management,Faculty of Agriculture,Universiti Putra Malaysia,Serdang,43400,Malaysia [2]Natural Medicines and Products Research Laboratory,Institute of Bioscience,Universiti Putra Malaysia,Serdang,43400,Malaysia [3]Department of Cell and Molecular Biology,Faculty of Biotechnology and Biomolecular Sciences,Universiti Putra Malaysia,Serdang,43400,Malaysia

出　　处：《Phyton-International Journal of Experimental Botany》2024年第2期213-226,共14页国际实验植物学杂志（英文）

基　　金：This paper was supported by Universiti Putra Malaysia,Innohub Grant Scheme(Vote No.9005004);D’Khairan Farm Sdn Bhd(Vote No.6300349).

摘　　要：Drought stress is a major factor affecting plant growth and crop yield production.Plant extracts as natural biostimulants hold great potential to strengthen plants to overcome drought impacts.To explore the effect of Polygonum minus extract(PME)in enhancing drought tolerance in plants,a study was set up in a glasshouse environment using 10 different treatment combinations.PME foliar application were designed in CRD and effects were closely observed related to the growth,physiology,and antioxidant system changes in maize(Zea mays L.)under well-watered and drought conditions.The seaweed extract(SWE)was used as a comparison.Plants subjected to drought stress exhibited a significant reduction in fresh weight,dry weight,relative water content(RWC),and soluble sugar,but they stimulated the phenolic,flavonoid,proline,glutathione(GSH),malondialdehyde(MDA)and antioxidant enzyme(catalase,CAT;peroxidase,POD;superoxide dismutase,SOD)activities.Foliar application of PME improved fresh and dry weight(FW:33.1%~41.4%;DW:48.0%~43.1%),chlorophyll content(Chl b:87.9%~100.76%),soluble sugar(23.6%~49.3%),and soluble protein(48.6%~56.9%)as well as antioxidant enzyme activities(CAT and POD)compared to CK under drought conditions.while decreasing the level of MDA.Notably,the mitigating effect of PME application with high concentration was more effective than those of SWE.Our study reveals that PME could alleviate drought stress by regulating osmoprotectant content and antioxidant defense system and can be used as an economical and environmentally friendly biostimulants for promoting maize growth under drought stress.

关 键 词：Drought biostimulants photosynthesis OSMOPROTECTANTS ANTIOXIDANTS MAIZE 

分 类 号：S513[农业科学—作物学]