Foliar spraying with paclobutrazol at the canopy rapid growth stage increased both yield and sugar content of sugar beet taproots

文献类型： 外文期刊

第一作者： Xu, Pengjie

作者： Xu, Pengjie;Zhou, Hongliang;Zhang, Lijuan;Huang, Ruimin;Wang, Kaiyong;Fan, Hua;Dong, Xinjiu

作者机构：

关键词： Physiological characteristics; Leaf senescence rate; Dry matter; Allocation index

期刊名称：EUROPEAN JOURNAL OF AGRONOMY （ 影响因子：5.5； 五年影响因子：5.9 ）

ISSN： 1161-0301

年卷期： 2025 年 171 卷

页码：

收录情况： SCI

摘要： Regulating the allocation of assimilates is a vital path to increase crop yield. Paclobutrazol is a plant growth retardant that can promote the yield formation of grain crops. It works by regulating the allocation of assimilates to the reproductive organs that are harvested. Still, its effect on the allocation of assimilates to sugar beet taproot, a vegetative organ vital for yield formation, is not yet clear. In a field trial carried out in 2022-2023 in northwest China, paclobutrazol was sprayed on sugar beet varieties Strube 13092 (ST) and Beta 796 (BT) 45 days after emergence (the canopy rapid growth stage). The concentrations used were 0 (M0), 150 (M1), 300 (M2), and 600 (M3) g ha-1. The goal was to clarify how the treatment affected sugar beet leaf physiology, dry matter accumulation, and distribution. The results showed that the physiological stress (O2 center dot-) brought by paclobutrazol caused a stress response in sugar beet leaves. Paclobutrazol treatment at the right concentration (M1) greatly enhanced the function of sugar beet leaves. It increased antioxidant enzyme activity (superoxide dismutase 3.1), osmolyte content (soluble sugars and free proline), chlorophyll content, and photosynthetic rate (Pn) compared to the control (M0). Paclobutrazol treatments significantly reduced the LAI (leaf area index) and slowed down the leaf senescence in the middle - late growing season. They postponed the time for sugar beets to reach the maximum dry matter accumulation, and also made the dry matter partitioning index (PI) for taproots reach 50 % 24 days earlier than the M0 treatment. At harvest, the sugar yield, taproot yield, sugar content, and net revenue of the paclobutrazol treatments were 18.1 %, 11.8 %, 31.6 %, and 34.5 % higher than those of the M0 treatment, respectively. Therefore, spraying with paclobutrazol at the right concentration during the canopy rapid growth stage could simultaneously increase the sugar content & yield of taproots. This technique has great potential in enhancing yield as well as economic benefits of sugar beet.

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