PLS211 Potato. Spooner et al 2008.

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Presentation transcript:

PLS211 Potato

Spooner et al 2008

Evolution and historical migration route for potato

Canary Islands

Geographical cline of ctDNA Hosaka and Hanneman. (1988) TAG 76:

Ct-DNA type distributions in ancestral and cultiated potato species

FDR

SDR

Dong et al 2000 TAG 101:1001

Tuber and flower traits Pigment producing genes: Tuber/sprout/flower color determined by three independent loci P purple pigment, petunidin. This locus is epistatic to D that produces red pigments pelargonidin and cyanidin in the flower. p=red, P masks alleles D and d. d in homozygous condition results in lack red anthocyanins Locus I self-colored; i white tubers P_D_I_ Blue tuber (blue flw) P_D_ii white tuber (blue flw) P_ddI_ blue tuber (pale blue flw) pp ddIi pink tuber (white flower) ppddii white tuber (white flower) ppD_I_ red tuber (red flw) ppD_ii white tuber (red flw) P on chrm 11, D on chrom 2

Additional loci B and F distribution of anthocyanin B: B d embryo spot, nodes and floral abscission zone, B c same except nodes, B a only abscission zone F full flower pigmentation, f flecked flowers Pf flesh anthocyanin Y= yellow flesh, y= white flesh B-I F-Pf linked on chrom 10 together with Ro, round tuber shape

Resistance genes Late blight race specific: R1 to R11, most of the mapped R1 and Rx2, Nb (PVX), Gpa (Globodera p.) linked on chrom 5 R3, R6, R7 linked on chrom 11 PVX hypersensitive res.: Nb, Nx PVX extreme res. Rx1, Rx2, Rx2 cloned (in tomato Sw5 [spotted wilt v]) PVY Gene family Ry. Nematodes: G. rostochensis. Gro and H1 G. pallida Gpa, Gpa2 linked to Rx1, chr 12

Corresponding Solanum tuberosum Genes to A. thaliana resistance orthologs Pajerowska et al 2005

Mapping of Linkage Groups 16 potato defense signaling genes mapped to 10 of the 12 chromosomes 5 of these genes were located in the same genome fragment as known quantitative resistance loci (QRL) These genes were sequenced and studied in more detail

Conclusions Thus of the 19 Arabidopsis genes related to pathogen recognition and response –16 potato Defense Homologs were identified 5 were closely linked to known QRLs StSGT-1/StSGT-2 : involved in cell cycle progression StPAD4-1/StPAD4-2: lipase like gene involved in salicyclic acid signalling StAOS2 – allele oxide synthase involved in the cytochrome P450 superfamily StEDS1- interactor of StPAD4