几个小麦持久抗条锈品种病情扩展动态研究

Studies on the disease development of several durable resistance wheat cultivars against stripe rust

在我国小麦条锈病常发易变区的陇南,对抗条锈性上分属不同类型的9个品种进行田间成株期病害发生特点的比较研究。结果表明参试的9个品种条锈病的反应型均为感病类型,主要差别表现在普遍率和严重度上。Libellula和N. Strampelli的普遍率和严重度保持最低水平,咸农4号与清农3号保持低严重度与普遍率,但在发病20 d后普遍率有一快速上升,其它品种均在发病后10 d左右达到较高的普遍率与严重度。Libellula、N. Strampelli和咸农4号同为持久抗性品种,但抗病机制不同。感病反应型、低普遍率与低严重度是持久抗病性的表型特点,但反之是否成立,以及持久抗病性表现的分子机制等尚需深入研究。

The studies to discover the rule of disease development in durable resistance to stripe rust in wheat were carried in Longnan region, where stripe rust occurred and mutated most frequently compared with else where in China. 9 cultivars which have been cultivated in many years were compared in characteristics of disease development in adult stage in the fields, among which some without losing resistance to strip rust while others losing resistance to strip rust. The 9 cultivars are all susceptible to strip rust, but severity and prevalence are different among them. The severity and prevalence of Libellula and N. Stranpelli were very less; the severity of Xiannong 4 and Qingnong 3 was very less while their prevalence has rapid increased after June 6; the severity and prevalence of other cultivars were very more after about 10 days. Libellula, N. Stranpelli and Xiannong 4 were all durable resistance to stripe rust, but their mechanism are different. Susceptible, less severity and prevalence are the characteristics of durable resistance cultivars, however the reverse is right or not, which should have been profoundly studied in molecular mechanism.