Botany and Plant Pathology, Purdue University, Lilly Hall, West Lafayette, IN, 47907-2054, USA.
Department of Plant Pathology, NC State University, 2574 Thomas Hall, Raleigh, NC, 27695-7616, USA.
Theor Appl Genet. 2015 Nov;128(11):2331-9. doi: 10.1007/s00122-015-2588-8. Epub 2015 Aug 4.
In this paper, we determine the genetic architecture controlling leaf flecking in maize and investigate its relationship to disease resistance and the defense response. Flecking is defined as a mild, often environmentally dependent lesion phenotype observed on the leaves of several commonly used maize inbred lines. Anecdotal evidence suggests a link between flecking and enhanced broad-spectrum disease resistance. Neither the genetic basis underlying flecking nor its possible relationship to disease resistance has been systematically evaluated. The commonly used maize inbred Mo17 has a mild flecking phenotype. The IBM-advanced intercross mapping population, derived from a cross between Mo17 and another commonly used inbred B73, has been used for mapping a number of traits in maize including several related to disease resistance. In this study, flecking was assessed in the IBM population over 6 environments. Several quantitative trait loci for flecking were identified, with the strongest one located on chromosome 6. Low but moderately significant correlations were observed between stronger flecking and higher disease resistance with respect to two diseases, southern leaf blight and northern leaf blight and between stronger flecking and a stronger defense response.
本文确定了控制玉米叶片斑纹的遗传结构，并研究了其与抗病性和防御反应的关系。斑纹是指在几种常用的玉米自交系叶片上观察到的一种轻微的、常受环境影响的病变表型。有传闻证据表明斑纹与广谱抗病性增强之间存在联系。斑纹的遗传基础及其与抗病性的可能关系尚未得到系统评估。常用的玉米自交系 Mo17 具有轻微的斑纹表型。源自 Mo17 和另一个常用自交系 B73 之间杂交的 IBM-advanced intercross 作图群体已被用于在玉米中定位许多性状，包括一些与抗病性相关的性状。在这项研究中，在 IBM 群体中在 6 个环境中评估了斑纹。鉴定出几个控制斑纹的数量性状位点，其中最强的一个位于第 6 号染色体上。在两个疾病（南方叶斑病和北方叶斑病）方面，更强的斑纹与更高的抗病性之间以及更强的斑纹与更强的防御反应之间观察到了低但中度显著的相关性。
