Reaction of Rice Varieties and Selections to Blast in Uniform Blast Nurseries

Abstract

全省性稻熱病統一病圃自民國63年至67年，5年間先後檢定693個水稻品種（系）。水稻罹病情形因年度及地區而異 。 一般言之，稉型稻品種較秈型稻者易罹稻熱病，尤以葉稻熱病為甚。水稻品種對葉稻熱病與穗稻熱病之抗性反應成顯著之正相關，惟尚有少數之例外。經檢定結果發現13個品系，其葉稻熱病罹病率低於0.7% ，而其穗稻熱病罹病率低於28.9﹪。 在本省目前主要推廣品種中只有8個品種能抗稻熱病，其對葉稻熱病之抗性反應為中抗（0.9~3.0%)，而對穗稻熱病之抗性 在中抗至抗（16.4~44.4%)之間。此等抗病品種（系）均可供為今後水稻育種之重要抗病來源。 A total of 693 rice varieties or selections were tested for reaction to blast at five uniform blast nurseries during the 5-year period from 1974 to 1978. The incidence of blast disease varied with years and nurseries. In general, Japonica rices were more susceptible to the disease than Indicas, particularly to the leaf blast. The reaction to leaf blast was significantly correlated with that to neck blast, although a lack of agreement was observed in certain entries. Thirteen selections showed an average infection of less than 0.7% for leaf blast and 28.9% for neck blast while eight commercial varieties had moderate resistance (0.9 to 3.0%) to leaf blast and moderate resistance (16.4 to 44.4%) to neck blast. These selections and varieties can be used as sources of resistance in future breeding programs.