Sequential functioning of Sym-13 and Sym-31, two genes affecting symbiosome development in root nodules of pea (Pisum sativum L.) |
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Authors: | Al Y Borisov S M Rozov V E Tsyganov E V Morzhina V K Lebsky I A Tikhonovich |
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Institution: | All-Russia Research Institute for Agricultural Microbiology, Podbelsky Chaussee 3, St. Petersburg-Pushkin 8, 189620 Russia, RU Institute of Cytology and Genetics, Novosibirsk, 630090 Russia, RU
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Abstract: | Two Fix? mutants of pea (Pisum sativum L.) which are unable to fix molecular nitrogen, E135f (sym-13) and Sprint-2Fix? (sym-31), were crossed to create the doubly homozygous recessive line, named RBT (sym-13, sym-31). The ultrastructural organization of nodules of the RBT line was compared with that of each of the two parental mutant lines and with the original wild-type genotypes of the cultivars Sparkle and Sprint-2. It was shown that the RBT line is similar to the mutant line Sprint-2Fix? in having abnormal symbiosome composition and bacteroids with relatively undifferentiated morphology. Because the phenotypic manifestation of the sym-31 mutant allele suppresses the phenotypic manifestation of the sym-13 mutant allele, it is concluded that the function of the gene Sym-31 (which is mutated in the Sprint-2Fix? line) is necessary at an earlier stage of symbiosome development than the gene Sym-13 (which is mutant in the E135f line). |
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