水稻의 耐病 耐蟲 耐冷性品種育成에 關한 硏究 Ⅱ. Semi-dwarf草型 찰벼 系統을 Carrier 로 쓰는 育種體系

Studies on the Rice Breeding for the Resistances to Diseases, Insects and for Cold Tolerance. Ⅱ. Utilization of Semi-dwarf Waxy Lines as the Carrier of High Productive Plant Type

The efficiency of once or twice back-crosses to semi-dwarf parent were demonstrated by breeding semi-dwarf waxy lines from the crosses of five different waxy donor parents and a semi-dwarf non-waxy recurrent parent. These waxy lines were crossed to amylose restorer varieties which has low, medium and high amylose content each. Selecting non-waxy plants in their F₂, F₃ and F₄, and analysing amylose content of their harvested seeds, demonstrated the recovery of the same level amylose content as their amylose restorer parent. From the results, a schematic breeding procedure was formulated which utilizes a carrier waxy line and an amylose restorer line. This procedure is suggested to be called “Carrier technique” in rice breeding.