Journal of Integrative Agriculture ›› 2015, Vol. 14 ›› Issue (5): 847-855.DOI: 10.1016/S2095-3119(14)60858-3

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Superior grains determined by grain weight are not fully correlated with the flowering order in rice

 PENG Ting, LÜ Qiang, ZHAO Ya-fan, SUN Hong-zheng, HAN Ying-chun, DU Yan-xiu, ZHANG Jing, LI Jun-zhou, WANG Lin-lin, ZHAO Quan-zhi   

  1. 1、Collaborative Innovation Center of Henan Grain Crops, Henan Agricultural University, Zhengzhou 450002, P.R.China
    2、Research Center for Rice Engineering in Henan Province, Henan Agricultural University, Zhengzhou 450002, P.R.China
    3、College of Agronomy, Henan University of Science and Technology, Luoyang 471003, P.R.China
  • 收稿日期:2014-04-14 出版日期:2015-05-01 发布日期:2015-05-13
  • 通讯作者: ZHAO Quan-zhi, Tel: +86-371-63558293,Fax: +86-371-63558122, E-mail: qzzhaoh@126.com
  • 作者简介:* These authors contributed equally to this study
  • 基金资助:

    This work was supported by the National Natural Science Foundation of China (31271651) and the projects from Rice Industrial Technology System in Henan Province, China (S2012-04-02).

Superior grains determined by grain weight are not fully correlated with the flowering order in rice

 PENG Ting, LÜ Qiang, ZHAO Ya-fan, SUN Hong-zheng, HAN Ying-chun, DU Yan-xiu, ZHANG Jing, LI Jun-zhou, WANG Lin-lin, ZHAO Quan-zhi   

  1. 1、Collaborative Innovation Center of Henan Grain Crops, Henan Agricultural University, Zhengzhou 450002, P.R.China
    2、Research Center for Rice Engineering in Henan Province, Henan Agricultural University, Zhengzhou 450002, P.R.China
    3、College of Agronomy, Henan University of Science and Technology, Luoyang 471003, P.R.China
  • Received:2014-04-14 Online:2015-05-01 Published:2015-05-13
  • Contact: ZHAO Quan-zhi, Tel: +86-371-63558293,Fax: +86-371-63558122, E-mail: qzzhaoh@126.com
  • About author:* These authors contributed equally to this study
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (31271651) and the projects from Rice Industrial Technology System in Henan Province, China (S2012-04-02).

摘要: Rice panicles are composed of many branches with two types of extreme grains, the superior and the inferior. Traditionally, it has been well accepted that earlier flowers result in superior grains and late flowers generate inferior grains. However, these correlations have never been strictly examined in practice. In order to determine the accurate relationship between superior and inferior grains and the flowering order, we localized all the seeds in a panicle in four distinct rice species and systematically documented the rice flowering order, flower locations and the final grain weight for their relationships. Our results demonstrated that the grain weight is more heavily determined by the position of the seeds than by the flowering order. Despite earlier flowering has a positive correlation with the grain weight in general, grains from flowers blooming on the second day after anthesis generally gained the highest weight. This suggests earlier flowers may not result in superior grains. Therefore, we concluded that superior and inferior grains, commonly determined by grain weight, are not fully correlated with the flowering order in rice. Following the order of the grain weight, the superior grains are generally localized at the middle parts of the primary branches, whereas inferior grains were mainly on the last two secondary branches of the lower half part of the panicle. In addition, the weight of inferior grains were affected by spikelet thinning and spraying with exogenous plant growth regulators, indicating that physiological incompetence might be the major reason for the occurrence of the inferior grains.

关键词: rice , flowering order , grain weight , grain position , inferior grains , superior grains

Abstract: Rice panicles are composed of many branches with two types of extreme grains, the superior and the inferior. Traditionally, it has been well accepted that earlier flowers result in superior grains and late flowers generate inferior grains. However, these correlations have never been strictly examined in practice. In order to determine the accurate relationship between superior and inferior grains and the flowering order, we localized all the seeds in a panicle in four distinct rice species and systematically documented the rice flowering order, flower locations and the final grain weight for their relationships. Our results demonstrated that the grain weight is more heavily determined by the position of the seeds than by the flowering order. Despite earlier flowering has a positive correlation with the grain weight in general, grains from flowers blooming on the second day after anthesis generally gained the highest weight. This suggests earlier flowers may not result in superior grains. Therefore, we concluded that superior and inferior grains, commonly determined by grain weight, are not fully correlated with the flowering order in rice. Following the order of the grain weight, the superior grains are generally localized at the middle parts of the primary branches, whereas inferior grains were mainly on the last two secondary branches of the lower half part of the panicle. In addition, the weight of inferior grains were affected by spikelet thinning and spraying with exogenous plant growth regulators, indicating that physiological incompetence might be the major reason for the occurrence of the inferior grains.

Key words: rice , flowering order , grain weight , grain position , inferior grains , superior grains