J Integr Plant Biol. ›› 2020, Vol. 62 ›› Issue (12): 1983-1996.DOI: 10.1111/jipb.12989

Special Issue: Seed development

• Plant Reproduction Biology • Previous Articles     Next Articles

OsbZIP76 interacts with OsNF‐YBs and regulates endosperm cellularization in rice (Oryza sativa)

Baixiao Niu1†, Hui Deng1†, Tingting Li2, Sandeep Sharma3, Qianbin Yun1, Qianru Li1, Zhiguo E2* and Chen Chen1*   

  1. 1Jiangsu Key Laboratory of Crop Genetics and Physiology/Key Laboratory of Plant Functional Genomics of the Ministry of Education/Jiangsu Key Laboratory of Crop Genomics and Molecular Breeding/Jiangsu Co‐Innovation Center for Modern Production Technology of Grain Crops, Agricultural College of Yangzhou University, Yangzhou 225009, China
    2Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou 310000, China
    3Department of Genetics and Plant Breeding, Institute of Agricultural Sciences, BHU, Varanasi 221005, India

    These authors contributed equally to this work.
    *Correspondences: Zhiguo E (ezhiguo@caas.cn); Chen Chen (chenchen@yzu.edu.cn, Dr. Chen is fully responsible for the distribution of the materials associated with this article)
  • Received:2020-04-23 Accepted:2020-07-03 Online:2020-07-04 Published:2020-12-01

Abstract: Following double fertilization, plant endosperm nuclei undergo syncytial divisions, followed by synchronous cellularization. Cellularization is a key event during endosperm development, but our understanding of its regulation is limited to Arabidopsis. In this study we show that OsbZIP76 regulates cellularization in rice (Oryza sativa). Activation of OsbZIP76 coincided with the initiation of cellularization, and its knockdown or knockout mutants exhibited precocious cellularization. Genes involved in endosperm development or starch biosynthesis were prematurely activated in the osbzip76 caryopsis. As a putative transcription factor, OsbZIP76 alone lacked transcriptional activation activity; however, it interacted with the nuclear factor Y (NF‐Y) family transcription factors OsNF‐YB9 and OsNF‐YB1 in yeast and in planta. OsbZIP76 and OsNF‐YB9 were predominantly expressed in the endosperm and the proteins colocalized. Seeds of osnf‐yb1 and osbzip76 mutants showed reduced size and reduced apparent amylose content. The parent‐of‐origin‐dependent expression of OsbZIP76 is variable in different rice accessions. In summary, OsbZIP76 is an endosperm‐expressed imprinted gene that regulates endosperm development in rice.

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