自家受精植物に於ける育種方法としての混系育種法(Bulk-method)に就いて
1951 年 1 巻 1 号 p. 15-20
詳細
1951 年 1 巻 1 号 p. 15-20
About the breedirig of self-fertilized: plants, the pedigree culture method by simple crass now has been carried out mainly in Japan, but in foreign countries various plant breeding methods has been practiced. Amomg these methods the bulk method has been especially discussed recently in a colleague of Jap anese plant breeders.. The bulk method that have been prevalent in foreign countries is such a method that almostly any artificial selections are never praceiced except some natural selections untill F5 oir F6 generation. When this method will be applied in our rice or wheat breeding, it is supposed that there are many matters to be discussed from the stand point of riews of the recent aspect about the varieties of rice or wheat and the objects of breeding in our country. In the cace of our rice dr wheat breed-ings, when a cetairi ideal type will be immgied to be bred coricerhirg man imcortant characters such disease resistance, grass habit, maturity, quality of grains and yield etc.; mariy allelomorphs more than 10 should be usually concidered everi in carefully chosen matings. In such a case it is almostly impossible to obtain the ideal object by the bulk method withotlt any selections. There-fore, we must carry out a bulk method with selections as strict as possible on individual plants, the majority of which are consisted of heterozygG'Lls plants, as an object in every generations. And when a certain breeding with such a lilraited object will be ceiried out, the bulk method with strict selec-tions in every generations will be strpposed to bc more simple in treatment and more effective than the pedigree culture method.
