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小麦品种Libellula和N.strampelli是甘肃陇南小麦条锈病常发易变区2个典型的持久抗病性品种,其不仅具有良好的成株抗病性,而且具有一定的全生育期抗病性。为了明确其全生育期抗条锈性遗传机制,本研究采用常规杂交分析和潜育期变温处理相结合的方法,分别在苗期常温(昼18℃/夜10℃)和高温(昼24℃/夜15℃)2种温域下,对其主效和微效抗条锈病基因进行遗传分析。结果表明,Libellula常温下对CYR29-mut3的抗病性由1对隐性主效基因控制,高温下对CYR29、CYR31和CYR32的抗病性由2对隐性温敏微效基因累加作用控制。N.strampelli常温下对CYR31的抗病性由2对隐性主效基因互补控制,高温下对CYR32的抗病性由2对隐性温敏微效基因互补控制。Libellula和N.strampelli既含有全生育期主效抗条锈基因,又含有温敏微效基因,建议在小麦抗条锈病育种中加以有效利用。
Two wheat cultivars, Libellula and N.strampelli, are two typical long-lasting disease-resistant cultivars in Longnan, Gansu, which are often susceptible to stripe rust. They are not only good in plant resistance but also resistant to disease during the whole growth period. In order to clarify the genetic mechanism of resistance to stripe rust during its whole growth period, we studied the genetic mechanism of stripe rust resistance during the whole growth period by using the methods of routine hybridization analysis and variable temperature incubation during the incubation period, respectively at the seedling stage of normal temperature (18 ℃ / night 10 ℃) and high temperature / Night 15 ℃) 2 kinds of temperature field, its main effect and minor stripe rust resistance gene genetic analysis. The results showed that the resistance of CYP1 to CYR29-mut3 was controlled by one recessive major gene at room temperature. The resistance to CYR29, CYR31 and CYR32 at high temperature was controlled by the additive effect of two pairs of recessive temperature-sensitive micro-effect genes. The resistance of N.strampelli to CYR31 at room temperature was controlled by two pairs of recessive major genes, and the resistance to CYR32 at high temperature was controlled by two pairs of recessive temperature-sensitive minor genes. Libellula and N.strampelli contain both the major-effect stripe rust resistance genes and the temperature-sensitive microsatellite genes during the whole growth period, which are suggested to be effectively utilized in the breeding of the resistance to stripe rust of wheat.