Foliar Application of Brassinolide Induced Regulation of Grain Yield and Quality,Antioxidant Responses and Aroma in Fragrant Rice  

作　　者：Jinhai Liu Rifang Lai Longxin He Pipeng Xing Haowen Luo Shuying Yang Yingbin Zou Xiangru Tang 

机构地区：[1]State Key Laboratory for Conservation and Utilization of Subtropical Agricultural Bioresources,South China Agricultural University,Guangzhou,510642,China [2]Scientific Observing and Experimental Station of Crop Cultivation in South China,Ministry of Agriculture,Guangzhou,510642,China [3]Guangzhou Key Laboratory for Science and Technology of Aromatic Rice,Guangzhou,510642,China [4]College of Agronomy,Hunan Agricultural University,Changsha,410128,China

出　　处：《Phyton-International Journal of Experimental Botany》2022年第5期1061-1071,共11页国际实验植物学杂志（英文）

基　　金：This study was financially supported by National Natural Science Foundation of China(31971843);Technology System of Modern Agricultural Industry in Guangdong(2020KJ105);Guangzhou Science and Technology Project(202103000075).

摘　　要：Brassinolide(BR)is a new green plant growth regulator.The present field study was conducted on two fragrant rice cultivars(i.e.,Meixiangzhan-2 and Xiangyaxiangzhan)to study the effects of foliar application of BR on fragrant rice performance.At the heading stage,BR solutions at 0.05,0.15,0.25 and 0.50 mg L-1 were sprayed on fragrant rice at 600 liters per hectare;these treatments were named as BR1,BR2,BR3 and BR4,respectively.The treatment sprayed with distilled water was taken as a control(CK).Compared with CK,the BR2 treatment significantly enhanced the chlorophyll concentration and net photosynthetic rate for Meixiangzhan-2,and Xiangyaxiangzhan.The BR3 and BR4 treatments increased the concentrations of chlorophyll a,chlorophyll b and carotenoid,and also enhanced net photosynthetic rate by 31.91%and 40.43%,respectively.Higher grain yields were recorded in the BR2 treatment than on CK on Meixiangzhan-2,while on Xiangyaxiangzhan,the BR3 and BR4 treatments increased grain yield compared with CK.In relation to CK,higher head rice rates were recorded in the BR2 treatment for Meixiangzhan-2,and in the BR3 and BR4 treatments for Xiangyaxiangzhan.BR treatments(BR2 for Meixiangzhan-2,BR3 and BR4 for Xiangyaxiangzhan)also significantly enhanced the activities of GPX,SOD and CAT by 10.22%to 23.00%,and reduced the malonaldehyde concentration.In addition,we observed that some BR treatments(BR2 for Meixiangzhan-2,BR3 and BR4 for Xiangyaxiangzhan)decreased the grain 2-acetyl-1-pyrroline concentration of fragrant rice.

关 键 词：BRASSINOLIDE CHLOROPHYLL yield formation fragrant rice antioxidant enzyme 

分 类 号：S565.4[农业科学—作物学]