Xinhua Wang¹ , Yanhui Lin¹ , Xiaoning Wang¹ , Xing Huo² , Jing Xu¹ , Honglin Zhu¹ , Liqiong Tang¹

1 Station of Crop Gene Resource & Germplasm Enhancement, Ministry of Agriculture, Hainan Key Laboratory of Crop Genetics and Breeding/Hainan Scientific Research, Institute of Food Crops, Hainan Academy of Agricultural Sciences, Haikou, 571100, China
2 Rice Research Institute, Guangdong Provincial Key Laboratory of New Technology in Rice Breeding, Guangdong Academy of Agricultural Sciences, Guangzhou, 510640, China
Author    Correspondence author
Rice Genomics and Genetics, 2023, Vol. 14, No. 1   doi: 10.5376/rgg.2023.14.0001
Received: 23 Mar., 2023    Accepted: 24 Mar., 2023    Published: 31 Mar., 2023

This article was first published in Molecular Plant Breeding in Chinese, and here was authorized to translate and publish the paper in English under the terms of Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Wang X.H., Lin Y.H., Wang X.N., Huo X., Xu J., Zhu H.L., Lin H., and Tang L.Q., 2023, Effect of paclobutrazol on important agronomic traits under different fertilization levels in Shanlan upland rice, Rice Genomics and Genetics, 14(1): 1-7 (doi: 10.5376/rgg.2023.14.0001)

Shanlan upland rice is endemic local land rice variety in Hainan, the rice price is higher and play an important role in poverty alleviation in recent years. The plant height of Shanlan upland rice is usually high. Consequently, it was easy to fall down, which is the main problems that caused seriously decrease of yield in Shanlan upland rice. The effect of fertilization and paclobutrazol on plant height and other important agronomic traits and its optimal concentration were studied in Ledong Shanlan upland rice ('LD-1'). The results showed that different fertilization levels mainly affected the grain number per panicle of 'LD-1', and then affected the yield. The yield was increased by reducing plant height and increasing effective panicle number per plant. Although the grain number per panicle decreased significantly, the yield was improved mainly by reducing plant height, increasing panicle number per plant and 1 000-grain weight under the interactions of different fertilization levels and paclobutrazol treatment. In general, 20 kg of compound fertilizer was applied per Mu, and 225 mg/kg of paclobutrazol was sprayed on 35 days after sowing (A3B3). Compared with the control group, plant height decreased by 25.29%, effective panicle number per plant increased by 34.28%, and yield increased by 33.64%, which was the best concentration combination. This provided theoretical basis and technical support for high and stable yield and efficient cultivation of Shanlan upland rice.

Ertilization; Paclobutrazol; Shanlan upland rice; Plant height; Yield