Alternaria leaf spot (ALS) caused by Alternaria carthami Chowdhury can cause yield loss up to 90% in safflower (Carthamus tinctorius L.) under severe conditions. Even though a definite source of ALS resistance is not available in cultivated species, a few of the wild species, viz. C. palaestinus and C. lantaus, are known to be tolerant to ALS. Therefore, an attempt was made to introgress Alternaria resistance from these species into cultivated species. F₁‐F₈ generations of crosses (PI537632 × C. palaestinus), (C. palaestinus × PI537632), (“Nira” × C. palaestinus) and ([MS 6(O) × C. lanatus] × C. palaestinus) were screened against ALS. ALS infection (%) was recorded in field and quantified using Windias Leaf Image Analysis system. Detached leaf technique was used in laboratory to confirm resistance in interspecific selections. Six resistant and 29 moderately resistant interspecific lines resembling mostly cultivated species were developed. Inheritance of ALS resistance indicated involvement of multiple minor alleles having small effects on resistance. The identified resistant lines could provide potential source of resistance to ALS for safflower breeding programmes.

中文翻译：

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对野生种对链格孢叶斑病的抗性渗入易感的栽培红花

严选条件下，由链格孢菌乔丹引起的链格孢菌叶斑病（ALS）可能导致红花（Carthamus tinctorius L.）的产量损失高达90％。即使在栽培种中没有明确的ALS抗性来源，也有少数野生种。已知C. palaestinus和C. lantaus可以耐受ALS。因此，试图将抗链球菌从这些物种渗入培养的物种。˚F ₁ -F _8个杂交（PI537632×几代 C. palaestinus），（C. palaestinus  ×PI537632），（“薤”×  C. palaestinus）和（[MS 6（O）×  C.西瓜]×  C. palaestinus）筛选针对ALS。现场记录ALS感染率（％），并使用Windias Leaf Image Analysis系统进行定量。在实验室中使用分离的叶技术来确认种间选择的抗性。已开发出六种抗药性和29种中抗性的种间品系，与大多数栽培种相似。ALS抗性的遗传表明涉及多个对抗性影响较小的次要等位基因。所确定的抗性品系可以为红花育种计划提供潜在的ALS抗性来源。