Wanyue Yao

Southwest University

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Guanghua He

Key Laboratory of Guangdong Province

Ting Zhang

Southwest University

Yinghua Ling

Southwest University

Yunfeng Li

Beijing Institute of Petrochemical Technology

Ye Li

Sun Yat-sen University

Jing You

Southwest University

Yidan Li

Northwest A&F University

Guoling Yu

Southwest University

Yu-jie TU

Southwest University

Huan Chen

Southwest University

Cooperative Institutions

Southwest University

Rice Research Institute

Chongqing Academy of Agricultural Sciences

Chinese Academy of Sciences

Zhejiang University

South China Agricultural University

Northwest A&F University

Chinese Academy of Agricultural Sciences

Shanxi Agricultural University

Institute of Genetics and Developmental Biology

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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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Gene mapping and candidate gene analysis of multi‐grains 1 (Mg1) in rice

Crop Science (2020)

Ting Zhang Jing You Xiaoqin Zeng Guoling Yu Yi Zhang

Abstract As the basic unit of rice ( Oryza sativa L.) inflorescence, the spikelet has a profound influence on grain size, weight, and yield. However, the molecular mechanism that underlies the development of spikelets has never been fully elucidated. In this study, we characterized a rice spikelet mutant, multi‐grains 1 ( mg1 ), which was derived from treatment of ‘Xinong 1B’ with ethyl methanesulfonate. In the mg1 mutant, the spikelet developed two florets with an extra lemma‐like organ and an increased number of inner floral organs. Notably, the spikelet could produce multi‐grains. These phenotypes reflect the considerable potential of using mg1 as a means of increasing rice yield. Genetic analysis revealed that the mg1 phenotype is controlled by a single recessive gene. The MG1 gene was mapped to the interval between simple sequence repeat (SSR) markers RM20754 and RM494 on chromosome 6 within a physical region of 121.57 kb. Sequencing analysis identified a single‐nucleotide substitution from G to A within Os06g0717200 (which corresponds to FLORAL ORGAN NUMBER 1 [ FON1 ]), causing an amino acid mutation of Gly‐869 to Asp‐869 in the mg1 mutant. This finding suggests that MG1 may be a novel allele of FON1 . MG1 is involved in the development of spikelet determinacy and floral organs by regulating the expression of genes associated with these characteristics. The present results detail a novel function of MG1 , which may facilitate the breeding of rice cultivars with increased numbers of grains per panicle.

Panicle

Ethyl methanesulfonate

Genetic Analysis

10.1002/csc2.20100

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Citations (3)

Gene mapping and candidate gene analysis of aberrant-floral spikelet 1 (afs1) in rice (Oryza sativa L.)

Journal of Integrative Agriculture (2020)

Ting Zhang Jing You Guoling Yu Yi Zhang Huan Chen

The spikelet is a unique inflorescence structure in grasses. However, the molecular mechanism that regulates its development remains unclear, and we therefore characterize a spikelet mutant of rice (Oryza sativa L.), aberrant-floral spikelet 1 (afs1), which was derived from treatment of Xinong 1B with ethyl methanesulfonate. In the afs1 mutant, the spikelet developed an additional lemma-like organ alongside the other normally developed floral organs, and the paleae were degenerated to differing degrees with or without normally developed inner floral organs. Genetic analysis revealed that the afs1 phenotype was controlled by a single recessive gene. The AFS1 gene was mapped between the insertion/deletion (InDel) marker Indel19 and the simple sequence repeat marker RM16893, with a physical distance of 128.5 kb on chromosome 4. Using sequence analysis, we identified the deletion of a 5-bp fragment and a transversion from G to A within LOC_Os04g32510/LAX2, which caused early termination of translation in the afs1 mutant. These findings suggest that AFS1 may be a new allele of LAX2, and is involved in the development of floral organs by regulating the expression of genes related to their development. The above results provide a new view on the function of LAX2, which may also regulate the development of spikelets.

Indel

Ethyl methanesulfonate

Genetic Analysis

10.1016/s2095-3119(19)62847-9

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