Chinese Journal OF Rice Science >
Effects of Different Concentrations of Paclobutrazol in Seedling Stage on Seedling Quality, Tillering Dynamics and Grain Yield of japonica Rice During Late Cropping Season in Southern China
#These authors contributed equally to this work
Received date: 2019-06-06
Revised date: 2019-08-04
Online published: 2020-03-10
【Objective】Sufficient panicle number holds the key to higher yield of late japonica rice in southern China. Our goal is to achieve sufficient panicle number by paclobutrazol treatment so as to gain higher yield. 【Method】The split plot was designed with variety as main area and paclobutrazol concentrations as sub-area. Zhendao 11 and Yongyou 2640 were used as late japonica rice materials and H you 518 as control. Five concentrations of paclobutrazol (calculated by active component; A1, 0 mg/L, A2, 84 mg/L, A3, 120 mg/L, A4, 156 mg/L and A5, 192 mg/L) were used in the present field experiment. We investigated the effects of different concentrations of paclobutrazol on seedling quality, tillering dynamics and yield of late japonica rice in southern China between 2014 and 2015.【Result】The seedling height gradually decreased during the two years. The leaf age of seedling and SPAD of H you 518 and Yongyou 2640 gradually increased, while those of Zhendao 11 increased first and then decreased with increasing concentrations of paclobutrazol. The seedling root length, root number, tiller number, productive panicle number, seed setting rate, grain plumpness and yield of the three cultivars increased first and then decreased along with the rising concentrations of paclobutrazol. These indexes of H you 518 and Yongyou 2640 peaked at 156 mg/L of paclobutrazol, and Zhendao 11 at 120 mg/L of paclobutrazol. 【Conclusion】Rice seedling quality, panicle number and yield were significantly enhanced by applying suitable concentrations of paclobutrazol. The yield of H you 518 and Yongyou 2640 peaked at 156 mg/L of paclobutrazol, while Zhendao 11 reached the highest yield at 120 mg/L of paclobutrazol.
Key words： paclobutrazol; late japonica rice; seedling quality; tiller dynamics; yield
Chen CHENG, Kai LEI, Huihuang CHENG, Shengliang WANG, Bo ZHU, Zhanjun LU, Bingke GAO, Binqiang WANG, Qinghua SHI, Yongjun ZENG . Effects of Different Concentrations of Paclobutrazol in Seedling Stage on Seedling Quality, Tillering Dynamics and Grain Yield of japonica Rice During Late Cropping Season in Southern China[J]. Chinese Journal OF Rice Science, 2020 , 34(2) : 150 -158 . DOI: 10.16819/j.1001-7216.2020.9064
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