, Volume 221, Issue 2, pp 222–230 | Cite as

Identification and fine mapping of a mutant gene for palealess spikelet in rice

  • Qiong Luo
  • Kaida Zhou
  • Xianfeng Zhao
  • Qianchun Zeng
  • Hongai Xia
  • Wenxue Zhai
  • Jichen Xu
  • Xianjun Wu
  • Hongsong Yang
  • Lihuang ZhuEmail author
Original Article


In grass, the evolutionary relationship between lemma and palea, and their relationship to the flower organs in dicots have been variously interpreted and wildely debated. In the present study, we carried out morphological and genetic analysis of a palealess mutant (pal) from rice (Oryza sativa L.), and fine mapping the gene responsible for the mutated trait. Together, our findings indicate that the palea is replaced by two leaf-like structures in the pal flowers, and this trait is controlled by one recessive gene, termed palealess1 (pal1). With a large F2 segregating population, the pal1 gene was finally mapped into a physical region of 35 kb. Our results also suggest that the lemma and palea of rice are not homologous organs, palea is likely evolutionarily equivalent to the eudicot sepal, and the pal1 should be an A function gene for rice floral organ identity.


Rice Floral organ identity Flower development Palealess mutant Finemapping 



Palealess mutant






Scanning electron microscopy


Ethylene-responsive element-binding protein









We would like to thank Prof. K.D. Zhou (Rice Research Institute of Sichuan Agriculture University, China) for providing parental materials, Dr X.Q. Wang (Institute of Genetics and Developmental Biology, CAS, China) for technical assistance in microscopy, and Prof. W. Xue (Institute of Biophysics, CAS, China) for SEM analysis. This work was supported by a grant from the National Natural Science Foundation of China (30370797).


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Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  • Qiong Luo
    • 1
  • Kaida Zhou
    • 2
  • Xianfeng Zhao
    • 1
  • Qianchun Zeng
    • 3
  • Hongai Xia
    • 1
  • Wenxue Zhai
    • 1
  • Jichen Xu
    • 1
  • Xianjun Wu
    • 2
  • Hongsong Yang
    • 2
  • Lihuang Zhu
    • 1
    Email author
  1. 1.Institute of Genetics and Developmental BiologyChinese Academy of ScienceBeijingChina
  2. 2.Rice Research Institute of Sichuan Agriculture UniversityWenjiangChina
  3. 3.Faculty of Agronomy and BiotechnologyYunnan Agricultural UniversityKunmingChina

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