Japanese journal of breeding 

About: Japanese journal of breeding is an academic journal. The journal publishes majorly in the area(s): Population & Pollen. It has an ISSN identifier of 0536-3683. It is also open access. Over the lifetime, 1957 publications have been published receiving 17753 citations.

Linkage map of restriction fragment length polymorphism loci in rice.

Abstract: We have constructed a genetic map of the nuclear genome in rice (Oryza sativa L.), utilizing 322 restriction fragment length polymorphism (RFLP) DNA markers and nine morphologlcal and biochemical genetlc markers. The RFLP map is based on the segregation of 144 F2 plants from a cross between Indica and Japonica varieties. The map covers a total of 1, 836 cM with 347 loci and exceeds the data recorded in the classical genetic map of rice by 58.5% and the current RFLP map (McCOUCH et al. 1988) by 32.2%. The RFLP linkage groups were assigned to the twelve chromosomes of rice using trisomic mutants andseveral genetic markers. This map should provide the basis for the mapping of genes controlling agronomic traits of rice.

New Endosperm Mutations Induced by Chemical Mutagens in Rice Oryza sativa L.

Abstract: Various kinds of mutations for endosperm or embryo character were induced in rice by treatment with three kinds of chemical mutagens, ethyl methanesulfonate (EMS), ethylene imine (EI) and N-methyl-N-nitrosourea (MNU). MNU induced few mutations in the treatment of dry seeds, but considerably more through the treatment of fertilized egg cells. The frequency of endosperm mutations was lower than that of chlorophyll mutations. The white core mutation was induced most frequently among mutations for endosperm or embryo character. Each of the mutants, except for floury mutant CM 2055, was controlled by a single recessive gene. Dull mutants were intermediate between waxy and non-waxy rice in the degrees of translucence and of staining by I-KI solution. The degrees of them were different among lines, although they were almost the same within a line. The phenotypic manifestations of white core and floury mutants were caused by the loose packing of round compound starch granules in their endosperm cells. From the analogy of grain features of rice with maize, the glassy and the floury types of wrinkled mutation were named as 'sugary' and 'shrunken', respectively. In addition to various endosperm mutations, a mutation for embryo character, 'giant embryo', was induced.

Breeding for Saline-resistant Varieties of Rice : I. Variability for Salt Tolerance among Some Rice Varietles

Abstract: Rice Varieties : Bluebonnet, IR 8, Jhona 349 and Magnolia responded quite differently to salinization. Each character showed a differential reaction to salinity. Three types of sterility i.e. cluster, delayed, and random caused by salinization could be classified. Regarding panicle weight and seed setting percentage, which are important from the agronomic standpoint, Jhona 349 was relatively the most resistant, while Magnolia the least.

Varietal Screening of Compatibility Types Revealed in F1 Fertility of Distant Crosses in Rice

Abstract: Reproductive barriers between distant groups of rice are anticipated to be overcome through a systematic use of widely compatible varieties in breeding programs. For this purpose a total of 74 varieties were screened for compatiblity types in terms of F1 fertility by crossing them to one each of indica and japonica testers. The compatibility of a variety to a tester was rated by pollen and spikelet fertility of the F1 hybrid. The pollen fertility of more than 90 percent and the spikelet fertility of 75-80 percent were rated normal. The compatibility tests showed that the pollen fertility is independent of the spikelet fertility. Therefore, each variety was inspected for four fertility scores, namely, the pollen and the spikelet fertility in each cross to an indica and a japonica tester. Out of 24 Indonesian upland varieties, 15 showed normal pollen fertility with both testers, and normal spikelet fertility with a japonica tester, but gave remarkable spikelet sterility with an indica tester. Six showed semi-sterility in all the four scores. Only one variety, Padi Bujang Pendek revealed normal fertility in all the four scores. The remaing two seemed to belong to an exceptional type. A total of 27 Aus varieties showed many types of compatibility including six varieties of indica type and five of japonica. Five varieties revealed sterility in all the four scores. Only two, Aus 373 and Dular seemed to be widely compatibe. The remaining nine were not classified into any difinite categories. In the test of 15 varieties which are identified tolerant of salinity, drought or peat soil, ten of strongly photoperiod-sensitive varieties were classified into typical indica rice. Two photoperiod-nonsensitiwe varieties were clearly identified to be japonica. In additional tests of some varieties which are notable from previous works, Calotoc, CPSLO 17 and Ketan Nangka were confirmed to be widely compatible. The screening results indicate that the Aus group of rice is a complex of various compatibility types, while a majority of Indonesian upland rices seemed to be of a type which is closer to japonicas rather than iledicas. Only a few varieties were identified as the wide-compatibility type, contrary to the expectation based on earlier works. It was discussed that the upland cultivation has permitted the Aus group to preserve the diverse compatibility types, while photoperiod-sensitive lowland varieties are predominantly of iledica type.