Vol.91, No.5, 2022, pp.1061-1071, doi:10.32604/phyton.2022.017634
OPEN ACCESS
ARTICLE
Foliar Application of Brassinolide Induced Regulation of Grain Yield and Quality, Antioxidant Responses and Aroma in Fragrant Rice
  • Jinhai Liu1,2,3,#, Rifang Lai1,2,3,#, Longxin He1,2,3, Pipeng Xing1,2,3, Haowen Luo1,2,3, Shuying Yang4, Yingbin Zou4, Xiangru Tang1,2,3,*
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
* Corresponding Author: Xiangru Tang. Email:
Received 26 May 2021; Accepted 09 October 2021; Issue published 24 January 2022
Abstract
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.
Keywords
Brassinolide; chlorophyll; yield formation; fragrant rice; antioxidant enzyme
Cite This Article
Liu, J., Lai, R., He, L., Xing, P., Luo, H. et al. (2022). Foliar Application of Brassinolide Induced Regulation of Grain Yield and Quality, Antioxidant Responses and Aroma in Fragrant Rice. Phyton-International Journal of Experimental Botany, 91(5), 1061–1071.
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