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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.

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