Functional conservation of wheat orthologs of maize rough sheath1 and rough sheath2 genes

Morimoto, Ryoko; Nishioka, Emi; Murai, Koji; Takumi, Shigeo

doi:10.1007/s11103-008-9422-5

Cited by 12 publications

(6 citation statements)

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“…One of the genes identified in the selected regions was TaOSH43 (Supplementary Fig. 13a), which regulates shoot meristem homeostasis and thus plant architecture and spike development 55 . A new haplotype emerged and became dominant in the Chinese landraces (Supplementary Fig.…”

Section: Resultsmentioning

confidence: 99%

Comparative Population Genomics of Bread Wheat(Triticum aestivum)Reveals Its Cultivation and Breeding History in China

Chen

Jiao

Wang

et al. 2019

Preprint

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22The evolution of bread wheat (Triticum aestivum) is distinctive in that 23 domestication, natural hybridization, and allopolyploid speciation have all had 24 significant effects on the diversification of its genome. Wheat was spread around 25 the world by humans and has been cultivated in China for ~4,600 years. Here, 26we report a comprehensive assessment of the evolution of wheat based on the 27 genome-wide resequencing of 120 representative landraces and elite wheat 28 accessions from China and other representative regions. We found substantially 29 higher genetic diversity in the A and B subgenomes than in the D subgenome. 30 Notably, the A and B subgenomes of the modern Chinese elite cultivars were 31 mainly derived from European landraces, while Chinese landraces had a greater 32 contribution to their D subgenomes. The duplicated copies of homoeologous 33 genes from the A, B, and D subgenomes were commonly found to be under 34 different levels of selection. Our genome-wide assessment of the genetic changes 35 associated with wheat breeding in China provides new strategies and practical 36 targets for future breeding. 37 38 Main 39 Bread wheat (Triticum aestivum) differs from other major grain crops, such as maize 40 (Zea mays), rice (Oryza sativa), and barley (Hordeum vulgare), by having an 41 allohexaploid genome with six sets of chromosomes, two sets each from three closely 42 related ancestral species that formed the A, B, and D subgenomes. Archaeological and 43 genetic evidence indicated that wheat underwent two polyploidization events during 44 its domestication. The first occurred ~0.82 million years ago between two diploid 45 species, T. urartu (AA) and an unknown close relative of Aegilops speltoides (SS), 46 which produced the allotetraploid T. turgidum (AABB). The second polyploidization 47 occurred during cultivation around 8,000-10,000 years ago, when T. turgidum 48 crossed with another diploid grass, Ae. tauschii (DD), to form the ancestral bread 49 wheat (T. aestivum, AABBDD) 1-4 . In addition, a recent genome analysis suggested 50 that Ae. tauschii originated from a more ancient homoploid hybridization event 51 between the A and B lineage ancestors 5 . The A, B, and D subgenomes comprise the 52 ~17-Gb allohexaploid bread wheat genome. Enormous genome sequencing efforts 53 have resulted in the recent publication of a reference genome sequence for wheat 4,6-9 , 54 which has greatly enhanced our understanding of the genome of this vital crop. 55After its evolution in the Middle East and Mediterranean regions, bread wheat 56 gradually spread to the rest of the world and was domesticated for human use 10 . China 57 3 has been cultivating bread wheat for ~4,600 years 11,12 , and has been the largest wheat-58 producing country for more than two decades. Wheat has been under continuous 59 artificial selection in the diverse ecological zones of China for thousands of years 11,13 ; 60 thus, the domestication and breeding of bread wheat in this country provides unique 61 evolutionary insights into h...

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Section: Resultsmentioning

confidence: 99%

Comparative Population Genomics of Bread Wheat(Triticum aestivum)Reveals Its Cultivation and Breeding History in China

Chen

Jiao

Wang

et al. 2019

Preprint

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“…WRS1 and WLG4 are wheat orthologs of maize rough sheath1 ( rs1 ) and liguleless4 ( lg4 ) KNOX genes, respectively [43,44]. Maize rs1 and lg4 belong to the class I KNOX gene family and play important roles in maintenance of shoot apical meristem (SAM) indeterminancy and differentiation of lateral organs [47-49].…”

Section: Resultsmentioning

confidence: 99%

“…Similarly, WBLH1 could interact with three class I KNOX proteins, WKNOX1, WRS1 and WLG4 (Figure 7). Wknox1 , WRS1 and WLG4 are related to KNAT1 , BP and KNAT5 , respectively [36,40,43]. Barley JuBEL1 also interacts with class I KNOX proteins BKN1 and BKN3, but not with class II KNOX protein BKN7 [31].…”

Section: Discussionmentioning

confidence: 99%

Characterization of wheat Bell1-type homeobox genes in floral organs of alloplasmic lines with Aegilops crassa cytoplasm

et al. 2011

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BackgroundAlloplasmic wheat lines with Aegilops crassa cytoplasm often show homeotic conversion of stamens into pistils under long-day conditions. In the pistillody-exhibiting florets, an ectopic ovule is formed within the transformed stamens, and female sterility is also observed because of abnormal integument development.ResultsIn this study, four wheat Bell1-like homeobox (BLH) genes were isolated and named WBLH1 to WBLH4. WBLH1/WBLH3/WBLH4 expression was observed in the basal boundary region of the ovary in both normal pistils and transformed stamens. WBLH2 was also strongly expressed in integuments not only of normal ovules in pistils but also of the ectopic ovules in transformed stamens, and the WBLH2 expression pattern in the sterile pistils seemed to be identical to that in normal ovules of fertile pistils. In addition, WBLH1 and WBLH3 showed interactions with the three wheat KNOX proteins through the BEL domain. WBLH2, however, formed a complex with wheat KNOTTED1 and ROUGH SHEATH1 orthologs through SKY and BEL domains, but not with a wheat LIGULELESS4 ortholog.ConclusionsExpression of the four WBLH genes is evident in reproductive organs including pistils and transformed stamens and is independent from female sterility in alloplasmic wheat lines with Ae. crassa cytoplasm. KNOX-BLH interaction was conserved among various plant species, indicating the significance of KNOX-BLH complex formation in wheat developmental processes. The functional features of WBLH2 are likely to be distinct from other BLH gene functions in wheat development.

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“…Morimoto et al . () cloned a wheat MYB gene orthologous to the maize rough sheath2 ( RS2 ), and showed that it had conserved function with RS2. Zhang et al .…”

Section: Introductionmentioning

confidence: 99%

An R2R3 MYB transcription factor in wheat, TaPIMP1, mediates host resistance to Bipolaris sorokiniana and drought stresses through regulation of defense‐ and stress‐related genes

et al. 2012

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SummaryIn this study, we report new insights into the function of a wheat (Triticum aestivum) MYB gene TaPIMP1 through overexpression and underexpression, and its underlying mechanism in wheat.Electrophoretic mobility shift and yeast-one-hybrid assays indicated that TaPIMP1 can bind to five MYB-binding sites including ACI, and activate the expression of the genes with the ciselement, confirming that TaPIMP1 is an MYB transcription activator.TaPIMP1-overexpressing transgenic wheat exhibited significantly enhanced resistance to the fungal pathogen Bipolaris sorokiniana and drought stresses, whereas TaPIMP1-underexpressing transgenic wheat showed more susceptibility to the stresses compared with untransformed wheat, revealing that TaPIMP1 positively modulates host-defense responses to B. sorokiniana and drought stresses. Microarray analysis showed that a subset of defense-and stress-related genes were up-regulated by TaPIMP1. These genes, including TaPIMP1, RD22, TLP4 and PR1a, were regulated by ABA and salicylic acid (SA). TaPIMP1-underexpressing transgenic wheat showed compromised induction of these stress-responsive genes following ABA and SA treatments.In summary, TaPIMP1, as a positive molecular linker, mediates resistance to B. sorokiniana and drought stresses by regulation of stress-related genes in ABA-and SA-signaling pathways in wheat. Furthermore, TaPIMP1 may provide a transgenic tool for engineering multiple-resistance wheat in breeding programs.

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Functional conservation of wheat orthologs of maize rough sheath1 and rough sheath2 genes

Cited by 12 publications

References 38 publications

Comparative Population Genomics of Bread Wheat(Triticum aestivum)Reveals Its Cultivation and Breeding History in China

Comparative Population Genomics of Bread Wheat(Triticum aestivum)Reveals Its Cultivation and Breeding History in China

Characterization of wheat Bell1-type homeobox genes in floral organs of alloplasmic lines with Aegilops crassa cytoplasm

An R2R3 MYB transcription factor in wheat, TaPIMP1, mediates host resistance to Bipolaris sorokiniana and drought stresses through regulation of defense‐ and stress‐related genes

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