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Population dynamic characteristics and formation mechanisms of super high-yielding of two types of glutinous rice in the middle and lower reaches of the Yangtze River

GUO Bao-Wei1,WANG Wang1,WANG Kai1,WANG Yan1,ZENG Xin1,JING Xiu1,WANG Jing1,NI Xin-Hua2,XU Ke1,ZHANG Hong-Cheng1,*   

  1. 1 Jiangsu Key Laboratory of Crop Cultivation and Physiology, Yangzhou University / Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops / Rice Industry Engineering Technology Research Institute, Yangzhou University, Yangzhou 225009, Jiangsu, China; 2 Agriculture and Rural Bureau of Youfang Town, Yangzhong County, Jiangsu Province, Yangzhong 212200, Jiangsu, China
  • Received:2025-01-20 Revised:2025-06-01 Accepted:2025-06-01 Published:2025-06-12
  • Supported by:
    This study was supported by the Key Research and Development Program of Jiangsu Province (BE2022338), the Leading Talent Introduction Program of Zhenjiang City’s Jinshan Talent Plan for Strong Industries (2021), and the Jiangsu Higher Education Institutions’ Advantage Discipline Construction Project (PAPD). 

Abstract:

To investigate the characteristics and formation patterns of super high-yielding (SHY) populations in glutinous rice and to provide theoretical guidance for high-yield cultivation, we used three glutinous rice cultivars as experimental materials: the conventional japonica variety Yangjingnuo 2 and the indicajaponica hybrid varieties Shuyounuo 82 and Shuyounuo 85. We analyzed the photosynthetic production and translocation of assimilates, population structure, lodging resistance, and yield performance across high-yielding (HY), higher-yielding (HRY), and super high-yielding (SHY) glutinous rice populations to clarify their characteristics and formation mechanisms. The results showed as follows(1) Compared with HY and HRY populations, the SHY population had a significantly higher total spikelet number, while 1000-grain weight and seed setting rate were slightly lower, but not significantly different. SHY populations were characterized by large panicles and high total spikelet numbers (exceeding 43,000×104 hm?2 in conventional japonica and 60,000×104 hm?2 in hybrid types), while maintaining stable 1000-grain weight and seed setting rate. (2) From the effective critical leaf age to the jointing stage, there were no significant differences in leaf area index (LAI) or photosynthetic potential among yield types. However, from heading to maturity, both LAI and photosynthetic potential followed the order SHY > HRY > HY, while leaf area decay rate showed the opposite trend. Differences among the three yield types were highly significant during this period. (3) No significant differences in dry matter accumulation were observed from the critical leaf age to the booting stage. However, from heading to maturity, SHY populations accumulated significantly more dry matter than HRY and HY. During the booting to milky stage, SHY also showed a significantly higher dry matter accumulation rate. From the milky to waxy stage, the accumulation rate did not differ significantly in the conventional japonica type, but in the hybrid indicajaponica type, SHY populations still exhibited a significantly higher rate than HRY and HY. (4) With increasing yield grade, the top three leaves became longer, with smaller opening and base angles and reduced drooping; plant height increased, and the plant architecture became more upright. The first, second, and third basal internodes increased significantly in length, thickness, and width, contributing to enhanced stem strength and lodging resistance. Except for the third internode in conventional glutinous rice, the lodging index significantly decreased with higher yield grades. (5) In both glutinous rice types, population yield was significantly correlated with LAI at heading, dry matter weight at heading and maturity, and net dry matter accumulation. A strong positive correlation was also found between yield and LAI at maturity. SHY populations possessed a large and stable sink capacity (panicle size), a strong photosynthetic source capacity after panicle initiation, and an upright plant type with high stem strength and lodging resistance. These traits contribute to increased late-stage photosynthate production and dry matter accumulation, supporting a favorable grain-to-leaf ratio for safe and stable grain filling.

Key words: glutinous rice, super-high yield, different yield groups, yield and its components, group characteristics

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