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Heading Uniformity: A New Comprehensive Indicator of Rice Population Quality

Author

Listed:
  • Chuanhai Shu

    (Crop Ecophysiology and Cultivation Key Laboratory of Sichuan Province, Rice Research Institute, Sichuan Agricultural University, Chengdu 611130, China
    The authors contributed equally to this work.)

  • Feijie Li

    (Crop Ecophysiology and Cultivation Key Laboratory of Sichuan Province, Rice Research Institute, Sichuan Agricultural University, Chengdu 611130, China
    The authors contributed equally to this work.)

  • Dongdong Liu

    (College of Agronomy, Sichuan Agricultural University, Chengdu 611130, China)

  • Jian Qin

    (Institute of Rice and Sorghum, Sichuan Academy of Agricultural Sciences, Deyang 618000, China)

  • Mingtian Wang

    (Sichuan Provincial Meteorological Service, Chengdu 610072, China)

  • Yongjian Sun

    (Crop Ecophysiology and Cultivation Key Laboratory of Sichuan Province, Rice Research Institute, Sichuan Agricultural University, Chengdu 611130, China)

  • Na Li

    (Crop Ecophysiology and Cultivation Key Laboratory of Sichuan Province, Rice Research Institute, Sichuan Agricultural University, Chengdu 611130, China)

  • Jun Ma

    (Crop Ecophysiology and Cultivation Key Laboratory of Sichuan Province, Rice Research Institute, Sichuan Agricultural University, Chengdu 611130, China)

  • Zhiyuan Yang

    (Crop Ecophysiology and Cultivation Key Laboratory of Sichuan Province, Rice Research Institute, Sichuan Agricultural University, Chengdu 611130, China)

Abstract

Productive tiller percentage (PTP) is the only available comprehensive indicator of rice population quality. However, productive panicle number (PN) has a great effect on its characterization accuracy. Panicle exsertion is an important but difficult to describe morphological index; therefore, it cannot be easily determined. The aims of this study were to develop heading uniformity (HU), which describes the difference in the degree of rice panicle exsertion, as a new comprehensive indicator by designing a representative sampling and calculation method and exploring the relationship between HU and yield components. HU first decreased then increased after initial heading, exhibiting a single-valley curve. Adequate HU was obtained by panicle sampling on day two or three (panicle N fertilizer proportion ≤40 or >40%) after initial heading. The explanatory power of PTP for grain yield variance was markedly insufficient in low- and high-PN rice populations. Compared with the percent contribution of PTP to grain yield variance (12.32–41.26%), that of HU (49.02–61.93%) was greater and more stable across rice populations of different PNs. Moreover, HU showed fewer interannual variations, despite large interannual differences in weather and soil conditions. Hence, HU may have applications as a comprehensive indicator of rice population quality.

Suggested Citation

  • Chuanhai Shu & Feijie Li & Dongdong Liu & Jian Qin & Mingtian Wang & Yongjian Sun & Na Li & Jun Ma & Zhiyuan Yang, 2021. "Heading Uniformity: A New Comprehensive Indicator of Rice Population Quality," Agriculture, MDPI, vol. 11(8), pages 1-13, August.
    • Handle: RePEc:gam:jagris:v:11:y:2021:i:8:p:770-:d:613190
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