Junhua Peng

Prof. Junhua Peng

Spring Valley Agriscience Co., Ltd., Jinan, Shandong, China
orcid

Research Focus & Metrics

Academic Career Length

32Years (1995-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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1 October 2004 in Genetics
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Journal Article
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LQL L Qi
L L Qi
BEB Echalier
B Echalier
SCS Chao
S Chao
GLG R Lazo
G R Lazo
GBG E Butler
G E Butler
BGB S Gill
B S Gill
Because of the huge size of the common wheat (Triticum aestivum L., 2n = 6x = 42, AABBDD) genome of 17,300 Mb, sequencing and mapping of the expressed portion is a logical first step for gene discovery. Here we report mapping of 7104 expressed sequence tag (EST) unigenes by Southern hybridization into a chromosome bin map using a set of wheat aneuploids and deletion stocks. Each EST detected a mean of 4.8 restriction fragments and 2.8 loci. More loci were mapped in the B genome (5774) than in the A (5173) or D (5146) genomes. The EST density was significantly higher for the D genome than for the A or B. In general, EST density increased relative to the physical distance from the centromere. The majority of EST-dense regions are in the distal parts of chromosomes. Most of the agronomically important genes are located in EST-dense regions. The chromosome bin map of ESTs is a unique resource for SNP analysis, comparative mapping, structural and functional analysis, and polyploid evolution, as well as providing a framework for constructing a sequence-ready, BAC-contig map of the wheat genome.

5 August 2003 in Genome Research
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MSMark E. Sorrells
Mark E. Sorrells
MRMauricio La Rota
Mauricio La Rota
CBCatherine E. Bermudez-Kandianis
Catherine E. Bermudez-Kandianis
RGRobert A. Greene
Robert A. Greene
RKRamesh Kantety
Ramesh Kantety
CQCalvin O. Qualset
Calvin O. Qualset
The use of DNA sequence-based comparative genomics for evolutionary studies and for transferring information from model species to crop species has revolutionized molecular genetics and crop improvement strategies. This study compared 4485 expressed sequence tags (ESTs) that were physically mapped in wheat chromosome bins, to the public rice genome sequence data from 2251 ordered BAC/PAC clones using BLAST. A rice genome view of homologous wheat genome locations based on comparative sequence analysis revealed numerous chromosomal rearrangements that will significantly complicate the use of rice as a model for cross-species transfer of information in nonconserved regions.

25 February 2003 in Proceedings of the National Academy of Sciences
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Junhua PengJunhua Peng
Junhua Peng
YRYefim Ronin
Yefim Ronin
TFTzion Fahima
Tzion Fahima
MRMarion Röder
Marion Röder
YLYouchun Li
Youchun Li
AKAbraham Korol
Abraham Korol
Wild emmer wheat,Triticum dicoccoides, is the progenitor of modern tetraploid and hexaploid cultivated wheats. Our objective was to map domestication-related quantitative trait loci (QTL) inT. dicoccoides. The studied traits include brittle rachis, heading date, plant height, grain size, yield, and yield components. Our mapping population was derived from a cross betweenT. dicoccoidesandTriticum durum. Approximately 70 domestication QTL effects were detected, nonrandomly distributed among and along chromosomes. Seven domestication syndrome factors were proposed, each affecting 5–11 traits. We showed: (i) clustering and strong effects of some QTLs; (ii) remarkable genomic association of strong domestication-related QTLs with gene-rich regions; and (iii) unexpected predominance of QTL effects in the A genome. The A genome of wheat may have played a more important role than the B genome during domestication evolution. The cryptic beneficial alleles at specific QTLs derived fromT. dicoccoidesmay contribute to wheat and cereal improvement.

8 January 2020 in Rice
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JNJiang Nan
Jiang Nan
JYJun Yan
Jun Yan
YLYi Liang
Yi Liang
YSYanlong Shi
Yanlong Shi
ZHZhizhou He
Zhizhou He
Junhua PengJunhua Peng
Junhua Peng
Rice (Oryza sativa L.) is a staple food crop, feeding more than 50% of the world’s population. Diseases caused by bacterial, fungal, and viral pathogens constantly threaten the rice production and lead to enormous yield losses. Bacterial blight (BB) and bacterial leaf streak (BLS), caused respectively by gram-negative bacteria Xanthomonas oryzae pv. oryzae (Xoo) and Xanthomonas oryzae pv. oryzicola (Xoc), are two important diseases affecting rice production worldwide. Due to the economic importance, extensive genetic and genomic studies have been conducted to elucidate the molecular mechanism of rice response to Xoo and Xoc in the last two decades. A series of resistance (R) genes and their cognate avirulence and virulence effector genes have been characterized. Here, we summarize the recent advances in studies on interactions between rice and the two pathogens through these R genes or their products and effectors. Breeding strategies to develop varieties with durable and broad-spectrum resistance to Xanthomonas oryzae based on the published studies are also discussed.

9 July 2011 in Molecular Breeding
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Junhua PengJunhua Peng
Junhua Peng
DSDongfa Sun
Dongfa Sun
ENEviatar Nevo
Eviatar Nevo

14 April 2003 in Genome Research
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Journal Article
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EAEduard D. Akhunov
Eduard D. Akhunov
AGAndrew W. Goodyear
Andrew W. Goodyear
SGShu Geng
Shu Geng
LQLi-Li Qi
Li-Li Qi
BEBenjamin Echalier
Benjamin Echalier
JDJan Dvorak
Jan Dvorak
Genes detected by wheat expressed sequence tags (ESTs) were mapped into chromosome bins delineated by breakpoints of 159 overlapping deletions. These data were used to assess the organizational and evolutionary aspects of wheat genomes. Relative gene density and recombination rate increased with the relative distance of a bin from the centromere. Single-gene loci present once in the wheat genomes were found predominantly in the proximal, low-recombination regions, while multigene loci tended to be more frequent in distal, high-recombination regions. One-quarter of all gene motifs within wheat genomes were represented by two or more duplicated loci (paralogous sets). For 40 such sets, ancestral loci and loci derived from them by duplication were identified. Loci derived by duplication were most frequently located in distal, high-recombination chromosome regions whereas ancestral loci were most frequently located proximal to them. It is suggested that recombination has played a central role in the evolution of wheat genome structure and that gradients of recombination rates along chromosome arms promote more rapid rates of genome evolution in distal, high-recombination regions than in proximal, low-recombination regions.