[Cytogenetic maps and their applications in plants].
Integrated cytogenetic maps encompass the information from both genetic maps and cytological maps. It is possible for cytogenetic maps to simultaneously report the cytological and genetic position of a maker. To constructure cytogenetic maps it is necessary to relate the markers mapped across linkage groups to cytological position on chromosomes. Cytogenetic maps have been constructured primarily in two ways. The first general strategy is to utilize the chromosome breakpoints to determine the location of genetically mapped markers on the chromosomes. A second way is by the direct hybridization of genetically mapped sequences onto chromosomes by FISH. In addition, a novel approach is to use RN-cM maps to predict the physical position of genetic markers on the chromosomes. Cytogenetic maps suggest that both the density of genes and the frequency of recombination increase towards the distal regions of chromosome arms, and they play significant roles in revealing gene colinearity between two species, exploring the evolution relationship between both of them and in map-based gene isolation.
Xiong
Huai-Yang
HY
Key Laboratory of MOE for Plant Developmental Biology, College of life science, Wuhan University, Wuhan 430072, China. xionghy1971@yahoo.com.cn
Zhao
Li-Juan
LJ
Li
Li-Jia
LJ
D002874:Chromosome Mapping / Q000379:methods*; D032461:Chromosomes, Plant / Q000235:genetics*; D003582:Cytogenetics / Q000379:methods*; D017404:In Situ Hybridization, Fluorescence; D010944:Plants / Q000235:genetics*