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ARTICLE
Effects of Paclobutrazol Seed Soaking on Non-Structural Carbohydrate and Grain Enrichment in Direct-Seeded Rice
1 Agronomy College, Jilin Agricultural University, Changchun, 130118, China
2 Jilin Academy of Agricultural Sciences, Changchun, 130118, China
* Corresponding Authors: Yanqiu Geng. Email: ; Liying Guo. Email:
# These two authors contributed equally to the article and are co-first authors
(This article belongs to the Special Issue: Crop Managements and Crop Adversity: Strategies, Mechanisms, and Implements)
Phyton-International Journal of Experimental Botany 2025, 94(1), 269-279. https://doi.org/10.32604/phyton.2025.060551
Received 04 November 2024; Accepted 26 December 2024; Issue published 24 January 2025
Abstract
The yield of direct-seeded rice (DSR) was constrained by inadequate grain filling. Recent studies have indicated that paclobutrazol application plays a significant role in enhancing crop agronomic traits and increasing yield. This study aimed to examine the effects of paclobutrazol seed soaking (PSS) on non-structural carbohydrate accumulation and grain enrichment in DSR, potentially providing a theoretical foundation for achieving high-yield DSR cultivation. The experiment utilized two rice varieties, Jiyujing (JYJ) and Jijing305 (JJ305), with seeds soaked in paclobutrazol concentrations of 0 mg L−1 and 100 mg L−1. PSS demonstrated increased chlorophyll content, net photosynthetic rate, and leaf area, as well as an extended photosynthetic function period during the filling stage. It also elevated soluble sugar and starch contents in the flag leaf (during the filling stage) and stem sheath (after heading), decreased starch content in the top panicle while increasing it in the middle and lower panicle during the filling stage, and enhanced spikelet per unit area and seed setting rate, thereby improving DSR yield. In conclusion, PSS enhanced the photosynthetic capacity of DSR during the filling stage, coordinated the filling process of superior and inferior grains, maintained source-sink balance, and facilitated stable and orderly filling, ultimately resulting in improved yield.Keywords
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