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Citrus Maps






Six groups have published linkage maps of citrus (Table 12.3), and additional maps are being developed. It is diffi cult to compare these maps because they have been devel- oped with different mapping programs and generally share few markers (Roose et al., 2000), but see Ruiz and Asins (2003) for a comparison of Citrus and Poncirus maps. These maps are incomplete in that the


 

 
 

Table 12.3. Summary of linkage maps of citrus (modifi ed from Roose et al., 2000).

Map Major

Total Marker Pop. length linkage Percent

 
 

Cross Markersz typesy size cM groupsx distorted Reference

C. maxima x Sankar and

(C. maxima x P. trifoliata) 310 I, F, R, S, O 60 874 9 26 Moore, 2001

C. maxima x

(C. reshni x P. trifoliata) 34, 97 I, F, R, O 52 600, 1500 4, 7 6, 37 Luro et al., 1995

C. sunki x P. trifoliata 63, 62 R 80 732, 867 5, 5 nd Cristofani et al.,

C. volkameriana x P. trifoliata 97, 73 I, R, F, S, O 80 460, 342 5, 4 29, 40 Ruiz and Asins.,

C. latipes x C. aurantium 92, 247 A, R, F 120? 433, 964 5, 8 nd Recupero et al.,

(C. paradisi x P. trifoliata) x

 
 

(C. sinensis x P. trifoliata) 153 I, F, R, S, O 57 701 14 17 Roose et al., 2000

z Where two values are given, these refer to maps for the female and male parent respectively

y I=isozymes, F=RFLP, R=RAPD, A=AFLP, S=SSR, O=Other

xMajor linkage groups is the number of groups with more than 4 markers.

 

 


 

number of major linkage groups is often less than the number of chromosomes (nine), and in most cases the total number of mark- ers is too few to give complete coverage of the genome. These criticisms do not indi- cate that the maps are not useful, but rather that development of effective linkage maps in citrus is incomplete. A second criticism of some of the maps is that the mapping populations are too small. Resolution of a map is determined by the number of recom- bination events on each chromosome. When too few meioses are studied, then few or no recombinants will be found between some loci and these cannot then be ordered accurately. Mapping populations should consist of at least 100 progeny to minimize these problems.

 

 






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