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Two Novel QTLs for Heading Date Are Identified Using a Set of Chromosome Segment Substitution Lines in Rice(Oryza sativa L.)

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Journal of Genetics and Genomics 2014年第12期41卷 659-662页

作者： Guojing Shen yongzhong xing National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research (Wuhan) Huazhong Agricultural University

Heading date in rice is a typical quantitative trait controlled by multiple quantitative trait loci （QTLs）. It is mainly regulated by environmental factors such as photoperiod and temperature （Izawa, 2007）. Many QTLs for heading date have been identified using different mapping populations and methods （http：// ***/qtl）. Up to date, several major heading date QTLs have been cloned by map-based cloning strategy （Yano et al., 2000; Takahashi et al., 2001; Kojima et al., 2002; Doi et al., 2004; Xue et al., 2008; Wei et al., 2010; Yan et al.,

关键词： QTLs Two Novel QTLs for Heading Date Are Identified Using a Set of Chromosome Segment Substitution Lines in Rice CSSLs Oryza sativa L

Validation and Characterization of Ghd7.1, a Major Quantitative Trait Locus with Pleiotropic Effects on Spikelets per Panicle, Plant Height, and Heading Date in Rice (Oryza sativa L.)

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Journal of Integrative Plant Biology 2013年第10期55卷 917-927页

作者： Touming Liu Haiyang Liu Huang Zhang yongzhong xing National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research (Wuhan) Huazhong Agricultural University

A quantitative trait locus （QTL） that affects heading date （HD） and the number of spikelets per panicle （SPP） was previously identified in a small region on chromosome 7 in rice （Oryza sativa L.）. In order to further characterize the QTL region, near isogenic lines （NILs） were quickly obtained by self-crossing recombinant inbred line 189, which is heterozygous in the vicinity of the target region. The pleiotropic effects of QTL Ghd7.1 on plant height （PH）, SPP, and HD, were validated using an NIL-F2 population. Ghd7.1 explained 50.2%, 45.3%, and 76.9% of phenotypic variation in PH, SPP, and HD, respectively. Ghd7.1 was precisely mapped to a 357-kb region on the basis of analysis of the progeny of the NIL-F2 population. Day-length treatment confirmed that Ghd7.1 is sensitive to photoperiod, with long days delaying heading up to 12.5 d. Identification of panicle initiation and development for the pair of NILs showed that Ghd7.1 elongated the photoperiod-sensitive phase more than 10 d, but did not change the basic vegetative phase and the reproductive growth phase. These findings indicated that Ghd7.1 regulates SPP by controlling the rate of panicle differentiation rather than the duration of panicle development.

关键词： Day-length treatment pleiotropic effects photoperiod sensitive phase rice.

The regulatory network mediated by circadian clock genes is related to heterosis in rice

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Journal of Integrative Plant Biology 2015年第3期57卷 300-312页

作者： Guojing Shen Wei Hu Bo Zhang yongzhong xing National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research (Wuhan) Huazhong Agricultural University

Exploitation of heterosis in rice（Oryza sativa L.） has contributed greatly to global food *** this study,we generated three sets of reciprocal F1 hybrids of indica and japonica subspecies to evaluate the relationship between yield heterosis and the circadian *** were no differences in trait performance or heterosis between the reciprocal hybrids,indicating no maternal effects on *** indica-indica and indica-japonica reciprocal F1 hybrids exhibited pronounced heterosis for chlorophyll and starch content in leaves and for grain yield/*** contrast,the japonica-japonica F1 hybrids showed low *** three circadian clock genes investigated expressed in an above-high-parent pattern（AHP）at seedling stage in all the *** five genes downstream of the circadian clock,and involved in chlorophyll and starch metabolic pathways,were expressed in AHP in hybrids with strong better-parent heterosis（BPH）.Similarly,three of these Research Arfive genes in the japonica-japonica F1 hybrids showing low BPH were expressed in positive overdominance,but the other two genes were expressed in additive or negative *** results indicated that the expression patterns of circadian clock genes and their downstream genes are associated with heterosis,which suggests that the circadian rhythm pathway may be related to heterosis in rice.

关键词： Circadian clock better-parent heterosis biomass overdominance yield

Short Panicle 3 controls panicle architecture by upregulating APO2/RFL and increasing cytokinin content in rice

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Journal of Integrative Plant Biology 2019年第9期61卷 987-999页

作者： Yong Huang Xufeng Bai Meifang Luo yongzhong xing National Key Laboratory of Crop Genetic Improvement Huazhong Agricultural UniversityWuhan 430070China

Inflorescence architecture is a major determinant of spikelet numbers per panicle, a key component of grain yield in rice. In this study, Short Panicle 3(SP3) was identified from a short panicle 3(sp3) mutant in which T-DNA was inserted in the promoter of SP3, resulting in a knockdown mutation. SP3 encodes a DNA binding with one finger(Dof) transcriptional activator. Quantitative real time(q RT)-PCR and RNA in situ hybridization assays confirmed that SP3 is preferentially expressed in the young rice inflorescence, specifically in the branch primordial regions. SP3 acts as a negative regulator of inflorescence meristem abortion by upregulating APO2/RFL. SP3 both up-and downregulates expression of genes involved in cytokinin biosynthesis and catabolism, respectively. Consequently, cytokinin concentrations are decreased in young sp3 panicles, thereby leading to small panicles having fewer branches and spikelets. Our findings support a model in which SP3 regulates panicle architecture by modulating cytokinin homeostasis. Potential applications to rice breeding, through gene-editing of the SP3 promoter are assessed.

关键词： DNA controls panicle architecture RFL APO

Breeding by design for future rice:Genes and genome technologies

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The Crop Journal 2021年第3期9卷 491-496页

作者： Jianlong Xu yongzhong xing Yunbi Xu Jianmin Wan National Key Facility for Crop Gene Resources and Genetic Improvement/Institute of Crop Sciences Chinese Academy of Agricultural SciencesBeijing 100081China Guangdong Laboratory of Lingnan Modern Agriculture Genome Analysis Laboratory of the Ministry of AgricultureAgricultural Genomics Institute at ShenzhenChinese Academy of Agricultural SciencesShenzhen 518120GuangdongChina National Key Laboratory of Crop Genetic Improvement National Center of Plant Gene Research(Wuhan)Huazhong Agricultural UniversityWuhan 430070HubeiChina International Maize and Wheat Improvement Center(CIMMYT) El BatanTexcoco 56130Mexico

*** Rice is a staple food for 3.2 billion *** food security threat that shook many Asian countries in 2008 still looms,because farmers are facing the challenge of producing more rice with fewer resources of water,land... 详细信息

关键词： Breeding threat producing

The heading-date gene Ghd7 inhibits seed germination by modulating the balance between abscisic acid and gibberellins

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The Crop Journal 2021年第2期9卷 297-304页

作者： Yong Hu Song Song Xiaoyu Weng Aiqing You yongzhong xing Hubei Key Laboratory of Food Crop Germplasm and Genetic Improvement Food Crops Research InstituteHubei Academy of Agricultural SciencesWuhan 430064HubeiChina National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research(Wuhan) Huazhong Agricultural UniversityWuhan 430070HubeiChina

Seed dormancy of cultivated rice was largely weakened during the progress of *** timing and uniformity of seed germination are important for rapid seedling establishment and highyield *** the present study,we found that the heading-date gene Ghd7 acted as a negative regulator of germination.A mutant of ghd7 showed low sensitivity to exogenous ABA treatment during seed *** investigation revealed reduced accumulation of ABA in mature ghd7 seeds as a consequence of dampened expression of OsNCED ***,elevated GA_(3) level was detected in seeds of ghd7 mutant during imbibition course,which was attributed to the induction of genes responsible for the synthesis pathways of bioactive ***,Ghd7 inhibits seed germination by increasing the ABA/GA_(3) *** revealing pleiotropic effects of Ghd7,our results indicate its role in linking seed germination to growth-phase transition in rice,which would enrich the theoretical basis for future breeding practices.

关键词： Ghd7 Seed germination Abscisic acid Gibberellins ABA/GA_(3)ratio

Molecular dissection of genetic basis of significant correlation among five morphological traits in rice(Oryza sativa L.)

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Chinese Science Bulletin 2010年第27期55卷 3154-3160页

作者： ZHANG YuShan WANG JianBo XU CaiGuo xing yongzhong National Key Laboratory of Crop Genetic Improvement Huazhong Agricultural University Wuhan 430070 China University of Electronic Science and Technology of China Zhongshan College Zhongshan 528402 China

To enhance understanding of the genetic basis of trait correlation in rice,a recombinant inbred line(RIL)population(F6 and F7) from a cross between Zhenshan97 and HR5 was employed to identify main quantitative trait loci(QTLs)and epistatic QTL(E-QTL).Highly significant positive correlations were detected among five traits of heading date(HD),plant height(PH),panicle length(PL),flag leaf length(FLL)and flag leaf width(FLW)in 2 *** to 8 main QTLs were detected for an individual *** E-QTL was detected for ***,4,4 and 5 E-QTLs were detected for FLL,HD,FLW and PL,*** E-QTL individually explained less than 3%of trait variation except *** of QTL results was made in order to dissect the genetic basis of trait *** found that main QTLs with pleiotropic effects and QTL clusters were the main genetic basis of trait *** E-QTL had pleiotropic effects.E-QTL played an important role in the genetic basis of individual trait,but it made a little contribution to trait correlation.

关键词：形态性状遗传基础 Oryza 水稻解剖 QTL检测 QTLs 电子邮件

Meeting partners at the right time promises varied flowering

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Molecular Plant 2022年第7期15卷 1092-1094页

作者： Haiyang Liu Zhanyi Zhang Wenhao Yan yongzhong xing College of Agriculture Yangtze UniversityJingzhou 434000China National Key Laboratory of Crop Genetic Improvement Huazhong Agricultural UniversityWuhan 430070China Hongshan Laboratory Wuhan 430070China

Photoperiodic flowering is critical for adaptability and high yield in *** this issue of Molecular Plant,Hu et al.(2022)report the autophagy-mediated degradation of Hd1 protein in the dark as a major regulatory mechanisrp of photoperiodic flowering,which promotes rice flowering under both short-day(SD)and long-day(LD)*** established regualtory mechanism links the cellular autophagy to plant climate adaptation and also explains the multiple functions of Hd1 in rice photoperiodic flowering.

关键词： flowering partner varied

Global analysis of CCT family knockout mutants identifies four genes involved in regulating heading date in rice

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Journal of Integrative Plant Biology 2021年第5期63卷 913-923页

作者： Jia Zhang Xiaowei Fan Yong Hu Xiangchun Zhou Qin He Liwen Liang yongzhong xing National Key Laboratory of Crop Genetic Improvement Huazhong Agricultural UniversityWuhan 430070China College of Life Science Jiangxi Normal UniversityNanchang 330022China

Many genes encoding CCT domain-containing proteins regulate flowering time. In rice(Oryza sativa), 41 such genes have been identified, but only a few have been shown to regulate heading date. Here, to test whether and how additional CCT family genes regulate heading date in rice, we classified these genes into five groups based on their diurnal expression patterns. The expression patterns of genes in the same subfamily or in close phylogenetic clades tended to be similar. We generated knockout mutants of the entire gene family via CRISPR/Cas9. The heading dates of knockout mutants of only 4 of 14 genes previously shown to regulate heading date were altered, pointing to functional redundancy of CCT family genes in regulating this trait. Analysis of mutants of four other genes showed that OsCCT22, OsCCT38, and OsCCT41 suppress heading under long-day conditions and promote heading under short-day conditions. OsCCT03 promotes heading under both conditions and upregulates the expression of Hd1 and Ehd1, a phenomenon not previously reported for other such genes. To date, at least 18 CCT domaincontaining genes involved in regulating heading have been identified, providing diverse, flexible gene combinations for generating rice varieties with a given heading date.

关键词： CCT family genes constant promoter of flowering CRISPR/Cas9 expression patterns knockout mutants rice