Qiannan Duan

Southwest University

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Guanghua He

Key Laboratory of Guangdong Province

Ting Zhang

Southwest University

Yunfeng Li

Beijing Institute of Petrochemical Technology

Yan Xiang

Southwest University

Yue Zhou

Southwest University

Wenwen Xiao

Rice Research Institute

Xinfang Zhang

Stomatology Hospital

Ye Li

Sun Yat-sen University

Jing You

Southwest University

Yinghua Ling

Southwest University

Cooperative Institutions

Southwest University

Rice Research Institute

Chinese Academy of Sciences

Chongqing Academy of Agricultural Sciences

Chinese Academy of Agricultural Sciences

Institute of Genetics and Developmental Biology

Sun Yat-sen University

Northwest A&F University

Henan Agricultural University

Zhejiang University

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LF1 regulates the lateral organs polarity development in rice

New Phytologist (2021)

Ting Zhang Jing You Yi Zhang Wanyue Yao Wenbo Chen

The patterning of adaxial-abaxial tissues plays a vital role in the morphology of lateral organs, which is maintained by antagonism between the genes that specify adaxial and abaxial tissue identity. The homeo-domain leucine zipper class III (HD-ZIP III) family genes regulate adaxial identity; however, little information is known about the physical interactions or transcriptionally regulated downstream genes of HD-ZIP III. In this study, we identified a dominant rice mutant, lateral floret 1 (lf1), which has defects in lateral organ polarity. LF1 encodes the HD-ZIP III transcription factor, which expressed in the adaxial area of lateral organs. LF1 can activate directly the expression of LITTLE ZIPPER family gene OsZPR4 and HD-ZIP II family gene OsHOX1, and OsZPR4 and OsHOX1 respectively interact with LF1 to form a heterodimer to repress the transcriptional activity of LF1. LF1 influences indole-3-acetic acid (IAA) content by directly regulating the expression of OsYUCCA6. Therefore, LF1 forms negative feedback loops between OsZPR4 and OsHOX1 to affect IAA content, leading to the regulation of lateral organs polarity development. These results reveal the cross-talk among HD-ZIP III, LITTLE ZIPPER, and HD-ZIP II proteins and provide new insights into the molecular mechanisms underlying the polarity development of lateral organs.

Polarity (international relations)

bZIP domain

Zipper

10.1111/nph.17220

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Citations (26)

The APC/CTAD1-WIDE LEAF 1-NARROW LEAF 1 pathway controls leaf width in rice

The Plant Cell (2022)

Jing You Wenwen Xiao Yue Zhou Wenqiang Shen Ye Li

Abstract Leaf morphology is one of the most important features of the ideal plant architecture. However, the genetic and molecular mechanisms controlling this feature in crops remain largely unknown. Here, we characterized the rice (Oryza sativa) wide leaf 1 (wl1) mutant, which has wider leaves than the wild-type due to more vascular bundles and greater distance between small vascular bundles. WL1 encodes a Cys-2/His-2-type zinc finger protein that interacts with Tillering and Dwarf 1 (TAD1), a co-activator of the anaphase-promoting complex/cyclosome (APC/C) (a multi-subunit E3 ligase). The APC/CTAD1 complex degrades WL1 via the ubiquitin-26S proteasome degradation pathway. Loss-of-function of TAD1 resulted in plants with narrow leaves due to reduced vascular bundle numbers and distance between the small vascular bundles. Interestingly, we found that WL1 negatively regulated the expression of a narrow leaf gene, NARROW LEAF 1 (NAL1), by recruiting the co-repressor TOPLESS-RELATED PROTEIN and directly binding to the NAL1 regulatory region to inhibit its expression by reducing the chromatin histone acetylation. Furthermore, biochemical and genetic analyses revealed that TAD1, WL1, and NAL1 operated in a common pathway to control the leaf width. Our study establishes an important framework for understanding the APC/CTAD1–WL1–NAL1 pathway-mediated control of leaf width in rice, and provides insights for improving crop plant architecture.

10.1093/plcell/koac232

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DEGENERATED LEMMA (DEL) regulates lemma development and affects rice grain yield

Physiology and Molecular Biology of Plants (2023)

Jing You Wenbo Chen Zhifeng He Yan Xiang Xinfang Zhang

Lemma (botany)

Glume

10.1007/s12298-023-01297-6

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Citations (2)

DEGENERATED LEMMA (DEL) Is a New Allele of OsRDR6 That Regulates Lemma Development and Affects Rice Grain Yield

Research Square (Research Square) (2022)

Jing You Qiannan Duan Jun Zhang Wenqiang Shen Yue Zhou

Abstract The lemma and palea are floral organ structures unique to grasses, and their development affects grain size. However, information on the molecular mechanism of lemma development is limited. In this study, we investigated a rice spikelet mutant, degenerated lemma ( del ), which developed florets with a slightly degenerated or rod-like lemma. The results indicate that the mutation of the DEL gene interfered with lemma development. In addition, del also showed a significant reduction in grain length and width, seed setting rate, and 1000-grain weight, which led to a reduction in yield. The results indicate that the mutation of the DEL gene further affects rice grain yield. Map-based cloning shows a single-nucleotide substitution from T to A within Os01g0527600/DEL , causing an amino acid mutation of Leu-34 to His-34 in the del mutant. DEL is an allele of OsRDR6 , encoding the RNA-dependent RNA polymerase 6, and is highly expressed in the spikelet. RT-qPCR results show that the expression of some floral organ identity genes was changed, which indicates that the DEL gene regulates lemma development by modulating the expression of these genes. The present results suggest that DEL plays an important role in lemma development and rice grain yield.

Lemma (botany)

10.21203/rs.3.rs-1147038/v1

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