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首页> 外文期刊>Theoretical and Applied Genetics >Mapping QTL, epistasis and genotype × environment interaction of antioxidant activity, chlorophyll content and head formation in domesticated lettuce (Lactuca sativa)
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Mapping QTL, epistasis and genotype × environment interaction of antioxidant activity, chlorophyll content and head formation in domesticated lettuce (Lactuca sativa)

机译：国产莴苣抗氧化活性，叶绿素含量和头部形成的QTL，上位性和基因型×环境相互作用的图谱

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摘要

Fruits and vegetables are rich sources of antioxidants in human diets and their intake is associated with chronic disease prevention. Lettuce (Lactuca sativa L.) is a common vegetable in diets worldwide, but its nutritional content is relatively low. To elucidate the genetic basis of antioxidant content in lettuce, we measured the oxygen radical absorbance capacity (ORAC) and chlorophyll (Chl) content as a proxy of β-carotene in an F8 recombinant inbred line (RIL) in multiple production cycles at two different production sites. Plants were phenotyped at the open-leaf stage to measure genetic potential (GP) or at market maturity (MM) to measure the influence of head architecture (‘head’ or ‘open’). Main effect quantitative trait loci (QTL) were identified at MM (three Chl and one ORAC QTL) and GP (two ORAC QTL). No main effect QTL for Chl was detected at GP, but epistatic interaction was identified in one pair of marker intervals for each trait at GP. Interactions with environment were also detected for both main and epistatic effects (two for main effect, and one for epistatic effect). Main effect QTL for plant architecture and nutritional traits at MM colocated to a single genomic region. Chlorophyll contents and ORAC values at MM were significantly higher and Chl a to Chl b ratios were lower in ‘open’ types compared to ‘head’ types. The nutritional traits assessed for GP showed a significant association with plant architecture suggesting pleiotropic effects or closely linked genes. Taken together, the antioxidant and chlorophyll content of lettuce is controlled by complex mechanisms and participating alleles change depending on growth stage and production environment.
机译：水果和蔬菜是人类饮食中抗氧化剂的丰富来源，其摄入与预防慢性疾病有关。生菜（Lactuca sativa L.）是全世界饮食中的常见蔬菜，但其营养含量相对较低。为了阐明莴苣中抗氧化剂含量的遗传基础，我们测量了F8 重组自交系（RIL）在多个生产中的氧自由基吸收能力（ORAC）和叶绿素（Chl）含量作为β-胡萝卜素的代表。在两个不同的生产地点循环。在开放叶阶段对植物进行表型分析，以测量遗传潜力（GP）或在市场成熟度（MM）上测量表头结构的影响（“头”或“开放”）。在MM（三个Chl和一个ORAC QTL）和GP（两个ORAC QTL）处确定了主要效应定量性状位点（QTL）。在GP处未检测到Chl的主要效应QTL，但在GP处每个性状的一对标记间隔中鉴定出上位相互作用。还检测到与环境的相互作用既有主要作用，也有上位作用（两种作用是主要作用，一种作用是上位作用）。 MM的植物结构和营养性状的主要效应QTL位于同一基因组区域。与“头部”类型相比，“开放”类型的叶绿素含量和ORAC值显着较高，而Chla与Chlb的比例较低。 GP的营养性状显示与植物结构显着相关，表明多效性作用或紧密相关的基因。综上所述，莴苣的抗氧化剂和叶绿素含量受复杂机制控制，参与等位基因根据生长期和生产环境而变化。

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    《Theoretical and Applied Genetics》 |2012年第8期|1487-1502|共16页
  • 作者

    Eiji Hayashi; Youngsook You; Rosemary Lewis; Mirna C. Calderon; Grace Wan; David W. Still;

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    Department of Plant Sciences California State Polytechnic University 3801 W. Temple Ave Pomona CA 91768 USA;

    Department of Plant Sciences California State Polytechnic University 3801 W. Temple Ave Pomona CA 91768 USA;

    Department of Plant Sciences California State Polytechnic University 3801 W. Temple Ave Pomona CA 91768 USA;

    Department of Plant Sciences California State Polytechnic University 3801 W. Temple Ave Pomona CA 91768 USA;

    Department of Plant Sciences California State Polytechnic University 3801 W. Temple Ave Pomona CA 91768 USA;

    Department of Plant Sciences California State Polytechnic University 3801 W. Temple Ave Pomona CA 91768 USA;

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