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A Study of Cytology, Isozyme, and Interspecific Hybridization on the Big-Achene Group of Buckwheat Species (Fagopyrum, Polygonaceae)

^a Institute of Plant Genetics and Breeding, School of Biological Technology and Engineering, Guizhou Normal University, Baoshan Beilu 116, Guiyang 550001, P.R. China
^b Technical Univ. of Munich, Lehrstuhl fuer Pflanzenbau und Pflanzenzuechtung, Lange Point 51, D-85350 Freising-Weihenstephan, Germany

View larger version (57K): [in a new window]   Fig. 1. The chromosomes of F. cymosum and F. giganteum. a and d are the metaphase of chromosomes of F. cymosum and F. giganteum in the mitotic cell of root tips, respectively. b and e are the karyotypes of chromosomes of F. cymosum and F. giganteum, respectively. There is obviously one larger (No. 1–8) and one smaller (No. 9–16) genome. c and f are the chromosomes of F. cymosum and F. giganteum in the meiosis MI of pollen mother cells, respectively. There are eight larger (marked with arrows) and eight smaller bivalents.

View larger version (18K): [in a new window]   Fig. 2. The karyotype models of genomes X, Y, M, and T in F. cymosum and F. giganteum.

View larger version (40K): [in a new window]   Fig. 3. Zymographs of GOT isozyme on a PAGE gel. The symbols are explained in Table 1.

View larger version (10K): [in a new window]   Fig. 4. Idiograms of GOT isozyme of eight types of buckwheat. E = F. esculentum, H = F. homotropicum, Z = F. zuogongense, T = F. tataricum, C = F. cymosum, P = F. pilus, M = F. megaspartanium, G = F. giganteum.