Mapping reciprocal effects and interactions with plant density stress in Zea mays L.
Mapping reciprocal effects and interactions with plant density stress in Zea mays L.
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DOI：
10.1038/sj.hdy.6800955
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发表时间：
2007-07-01
期刊：
影响因子：
3.8
通讯作者：
McIntyre, L. M.
中科院分区：
文献类型：
--
作者：
Gonzalo, M.;Vyn, T. J.;McIntyre, L. M.
互惠效应是由于亲本的遗传效应（即母本和父本效应）、细胞质效应和亲本来源效应。而玉米（Zea mays L.）互惠效应的存在程度，或可归因于具体的基本组成部分的程度，仍然是一个令人感兴趣和研究的领域。几位研究者报道了用于谷物和青贮饲料的不同类型玉米材料的各种农艺性状的相互作用。玉米遗传学家和育种家已经认识到互惠效应是遗传变异的一个来源，但是在观察这些效应时缺乏一致性，特别是由于胁迫条件，阻止了在实际育种计划中系统地利用这些效应。越来越多的分子证据表明玉米中的潜在机制，这可能是相互作用的存在和不稳定的原因。在这项研究中，我们开发了互惠回交群体的基础上，最初的重组自交系。该群体用于将相互作用分解为基础组分（母体、细胞质和起源亲本）效应。我们还开发了统计框架，以确定和映射特定的核染色体区域的相互作用的贡献。我们发现，在母系父母，胚乳DNA和母系传播的因素的差异共同影响的相互作用在本赛季早期，他们的影响在后期稀释。我们还发现，在孢子体DNA的起源的父母的影响存在于所有阶段的证据，并发挥了重要的作用，在以后的发展阶段建立互惠回交之间的差异。
Reciprocal effects are due to genetic effects of the parents (i.e. maternal and paternal effects), cytoplasmic effects and parent-of-origin effects. However, in Zea mays L. the extent to which reciprocal effects exist, or can be attributed to specific underlying components, remains an area of interest and study. Reciprocal effects have been reported by several investigators for various agronomic characters in different types of maize materials for grain and silage usage. Maize geneticists and breeders have recognized reciprocal effects as one source of genetic variability, but the lack of consistency in the observation of these effects, particularly due to stress conditions, has prevented a systematic exploitation of these effects in practical breeding programs. There is mounting molecular evidence for underlying mechanisms in maize, which could be responsible for both the existence, and the instability of reciprocal effects. In this study, we developed population of reciprocal backcrosses based on an initial set of recombinant inbred lines. This population was used for dissecting reciprocal effects into the underlying components (maternal, cytoplasmic and parent-of-origin) effects. We also developed statistical framework to identify and map contributions of specific nuclear chromosomal regions to reciprocal effects. We showed that differences in maternal parents, endosperm DNA and maternally transmitted factors collectively influence reciprocal effects early during the season, and that their influence diluted at later stages. We also found evidence that parent-of-origin effects in the sporophyte DNA existed at all stages and played an important role in establishing differences between reciprocal backcrosses at later developmental stages.