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    Discovery, characterisation and mapping of wheat leaf rust resistance gene Lr71
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    Keywords:
    Genetic linkage
    Stripe rust
    Rust (programming language)
    Common wheat
    Chromosomal region
    SWAHEN 3, a durum wheat line introduced from CIMMYT, was highly resistant to Chinese new stripe rust races CYR30 and CYR31 at adult stage. In order to determince the inheritance of resistance in it, SWAHEN 3 was crossed with a highly susceptible durum variety Kappli and five highly susceptible cultivars of Sichuan common wheat. Analysis of data from F 1~F 2 of cross between SWAHEN 3 and Kappli revealed that the resistance to CYR30 and CYR31 of SWAHEN 3 was controlled by two complementary dominant genes. And all of F 1 hybrids of SWAHEN 3 crossed with five Sichuan common wheat cultivars were immune to the two Chinese stripe rust races. This result could indicated the resistance of SWAHEN 3 could be expressed in common wheat.
    Common wheat
    Stripe rust
    Rust (programming language)
    Inheritance
    Citations (0)
    Wheat stripe rust,caused by Puccinia striiformis f.sp.tritici,is a major foliar disease,largely influencing the wheat production in China.Identification of stripe rust resistance genes and their closely linked molecular markers is of great importance in breeding resistant wheat cultivars.The objective of this study was to map a stripe rust resistance gene in wheat line Guizhou 98-18 using molecular markers.The stripe rust resistance gene,designated as YrG98 tentatively,was located on chromosome 3DS,and linked to the SSR loci Xgwm161 and Xcfd79,with genetic distances of 3.9 cM and 4.2 cM,respectively,which is likely to be a new gene for stripe rust resistance.This study will provide an useful stripe rust resistance gene and its closely linked molecular markers for wheat breeding.
    Stripe rust
    Rust (programming language)
    Common wheat
    Puccinia striiformis
    Molecular marker
    Citations (0)
    Abstract A new gene, Yr24 , for resistance to stripe rust was transferred from a durum accession to common wheat via an amphiploid (synthetic wheat) with Aegilops tauschii. Yr24 was located in chromosome 1B by monosomic analysis. Its genetic linkage of 4 cM with Yr15 indicated its localization to the short arm.
    Aegilops tauschii
    Stripe rust
    Common wheat
    Rust (programming language)
    Linkage (software)
    Synthetichexaploidwheatisanimportantgermplasm �resourcefortransferofbeneficialgenesfromali enspeciesto� commonwheat�( Triticum aestivumL.).�SynthetichexaploidwheatSE5756�confersahi ghlevelofresistanceagainstawide� rangeofracesof� Puccinia striiformisWest.�f.�sp.� tritici Eriks.�etHenn.( Pst).�Theobjectivesofthisstudyweretodetermine� theinheritancepattern,�adjacentmolecularmarkers ,�andchromosomallocationofthestriperustresis tancegeneinSE5756� andtodevelopnewgermplasm.�Weconstructedasegr
    Common wheat
    Stripe rust
    Gene transfer
    Rust (programming language)
    Stem rust
    Citations (6)
    The results indicated that YrQz was located on the long arm of wheat chromosome 2B and resided in a region flanked by two SSR loci Xgwm388 and Xgwm526. Two AFLP markers P35M48(452) and P36M61(163) were closely linked to YrQz with the genetic distance of 3.4 cM and 4.1 cM, respectively. To our knowledge, this is the first molecularly mapped stripe rust resistance gene on wheat chromosome 2B.
    Stripe rust
    Common wheat
    Rust (programming language)
    Identification
    Citations (11)
    Wheat stripe rust, caused by Puccinia striiformis f.sp. tritici (PST), is one of the most devastating diseases of common wheat, Triticum aestivum L., in China. Chuanmai 42, a new wheat variety derived from synthetics between Triticum durum and Aegilops tauschii, was highly resistant to Chinese newly predominant races of Chinese Yellow Race (CYR32) at adult stage. To determine the inheritance of resistance in Chuanmai 42, it was crossed and backcrossed with the susceptible Sichuan varieties of common wheat Mianyang 26 (MY26) and Mianyang 335 (MY335) for preparing the F_2 and BC_1 populations. A total of 208 and 337 F_2 plants of Chuanmai 42×MY26, Chuanmai 42×MY335, and 171 and 216 BC_1 plants of Chuanmai 42/MY26MY26, Chuanmai 42/MY335MY335, respectively, were used for resistance analyses. All of F_1 hybrids of such crosses were immune or highly resistant and F_2, BC_1 population displayed the segregation into resistance and susceptible while inoculated with CYR32 (Chinese stripe rust race) in the adult plant stage. The chi-square test confirmed that the frequencies of resistance versus susceptible individuals were in accordance with the 3R[KG*6]∶1S and 1R[KG*6]∶1S ratio in F_2 population and BC_1 populations, respectively. The results indicated that the resistance of Chuanmai 42 to CYR32 is controlled by a single dominant gene.
    Aegilops tauschii
    Common wheat
    Stripe rust
    Puccinia striiformis
    Citations (3)
    Chuanmai 38(99-607),a new wheat variety derived from synthetics(Triticum durum × Aegilops tauschii),was highly resistant to Chinese newly predominant race of wheat stripe rust CYR32 at adult stage.To determine the inheritance of resistance in Chuanmai 38,it was crossed with five susceptible Sichuan varieties of common wheat such as MY26 and so on.All of F_1 hybrids of such crosses were immune or highly resistant to the Chinese stripe rust races.The segregation of resistance in F_2 of these crosses revealed that a single dominant gene controlled the resistance in Chuanmai 38 to CYR32.When Chuanmai 38 was crossed with four other highly resistance varieties including Germany Wheat 8661 (Yr13) and other three wheat varieties derived from synthetics(Chuanmai 42,Chuan3736 and Double spikelet wheat),a certain of susceptible individuals were observed in F_2 population.It indicated the resistance gene in Chuanmai 38 was different from that in the latter four varieties.
    Aegilops tauschii
    Common wheat
    Stripe rust
    Aegilops
    Citations (2)