SHORT ROOT and INDETERMINATE DOMAIN family members govern PIN-FORMED expression to regulate minor vein differentiation in rice

Author:

Liu Qiming12ORCID,Teng Shouzhen12ORCID,Deng Chen2ORCID,Wu Suting12ORCID,Li Haoshu12ORCID,Wang Yanwei2ORCID,Wu Jinxia12ORCID,Cui Xuean12ORCID,Zhang Zhiguo12ORCID,Quick William Paul234ORCID,Brutnell Thomas P2ORCID,Sun Xuehui12ORCID,Lu Tiegang12ORCID

Affiliation:

1. Biotechnology Research Institute (BRI), Chinese Academy of Agricultural Sciences (CAAS) , Beijing 100081 , China

2. Joint Laboratory for Photosynthesis Enhancement and C4 Rice Development, BRI, CAAS , Beijing 100081 , China

3. C4 Rice Centre, International Rice Research Institute , Los Banos, Laguna 4030 , Philippines

4. Department of Animal and Plant Sciences, University of Sheffield , Sheffield S10 2TN , UK

Abstract

Abstract C3 and C4 grasses directly and indirectly provide the vast majority of calories to the human diet, yet our understanding of the molecular mechanisms driving photosynthetic productivity in grasses is largely unexplored. Ground meristem cells divide to form mesophyll or vascular initial cells early in leaf development in C3 and C4 grasses. Here we define a genetic circuit composed of SHORT ROOT (SHR), INDETERMINATE DOMAIN (IDD), and PIN-FORMED (PIN) family members that specifies vascular identify and ground cell proliferation in leaves of both C3 and C4 grasses. Ectopic expression and loss-of-function mutant studies of SHR paralogs in the C3 plant Oryza sativa (rice) and the C4 plant Setaria viridis (green millet) revealed the roles of these genes in both minor vein formation and ground cell differentiation. Genetic and in vitro studies further suggested that SHR regulates this process through its interactions with IDD12 and 13. We also revealed direct interactions of these IDD proteins with a putative regulatory element within the auxin transporter gene PIN5c. Collectively, these findings indicate that a SHR–IDD regulatory circuit mediates auxin transport by negatively regulating PIN expression to modulate minor vein patterning in the grasses.

Funder

National Key Research and Development Program (NKRDP) of China

Agricultural Science and Technology Innovation Program

Publisher

Oxford University Press (OUP)

Subject

Cell Biology,Plant Science

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