Chinese Journal OF Rice Science >
Inter-varietal Differences in Early Tillering Characteristics and Their Responses to Nitrogen
Received date: 2024-05-24
Revised date: 2024-08-02
Online published: 2025-01-14
【Objective】This study was conducted to explore the physiological mechanisms underlying inter-varietal differences in early-tillering characteristics and their responses to nitrogen, laying a theoretical basis for the breeding and cultivation of high-yield, high-efficiency rice varieties.【Method】A pot experiment was carried out using different rice varieties that exhibit significant differences in tillering speed at various nitrogen supply levels. The varietal differences in tillering characteristics and associated agronomic and physiological traits were analyzed, including biomass accumulation, yield and yield components, photosynthetic assimilation, root activity, plant nitrogen concentration, hormone contents in tillering nodes, and their responses to nitrogen.【Result】Based on the maximum number of tillers and tillering speed, Shanyou 63, Liangyoupeijiu, and R3012 were identified as early-tillering varieties, while Yangdao 6 was classified as a variety with general tillering speed. Huaidao 5 and Nanjing 9108 were classified as late tillering varieties. The early-tillering varieties were more sensitive to nitrogen supply. The biomass, number of panicles per pot, and yield of the early-tillering varieties, along with plant nitrogen concentration, activity of key enzymes involved in nitrogen metabolism, leaf photosynthetic rate, root oxidation capacity, and bleeding flow at the tillering stage, were significantly higher than those of the other varieties. The root systems of these varieties were more developed compared to others, with lower auxin content and higher cytokinin content in the tillering nodes. The responses of these agronomic and physiological traits to nitrogen in the early-tillering varieties were more sensitive. Similar trends in varietal differences were observed across various types of rice varieties.【Conclusion】High photosynthetic rates, enhanced root activity, elevated activities of key enzymes involved in nitrogen metabolism, low auxin content, and high cytokinin content in the tillering nodes are important mechanisms that accelerate tillering in rice.
Key words： rice; early tillering; photosynthetic rate; root activity; hormones
WU Meng, NI Chuan, KANG Yuying, MAO Yuxin, YE Miao, ZHANG Zujian . Inter-varietal Differences in Early Tillering Characteristics and Their Responses to Nitrogen[J]. Chinese Journal OF Rice Science, 2025 , 39(1) : 101 -114 . DOI: 10.16819/j.1001-7216.2025.240513
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