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果聚糖在生理特性中是否具有功能作用？通过数量性状基因座定位进行研究。

Does fructan have a functional role in physiological traits? Investigation by quantitative trait locus mapping.

作者信息

Turner L B, Cairns A J, Armstead I P, Thomas H, Humphreys M W, Humphreys M O

机构信息

Institute of Grassland and Environmental Research (IGER) , Plas Gogerddan, Aberystwyth, Ceredigion, SY23 3EB. UK.

出版信息

New Phytol. 2008;179(3):765-775. doi: 10.1111/j.1469-8137.2008.02495.x. Epub 2008 May 27.

DOI:10.1111/j.1469-8137.2008.02495.x
PMID:18507776
Abstract
  • The role of fructan in growth and drought-stress responses of perennial ryegrass (Lolium perenne) was investigated in an F(2) mapping family that segregates for carbohydrate metabolism. * A quantitative trait locus approach was used to compare the genetic control of traits. * Growth and drought-stress traits were extremely variable within the family. Most traits had high broad-sense heritability. Quantitative trait loci (QTL) were identified for most traits; the maximum number of QTL per trait was four. Between 11% and 75% of total phenotypic variation was explained. Few growth-trait QTL coincided with previously identified fructan QTL. A cluster of drought-trait QTL was close to two previously identified regions of the genome with tiller base fructan QTL in repulsion. * The high sugar parent contributed few alleles that increased 'reserve-driven' growth or performance during drought-stress. Correlation of growth and drought-stress traits with fructan content was low and increasing fructan content per se would not appear to improve drought resistance. Complex patterns of carbohydrate partitioning and metabolism within the cell may explain contradictory relationships between carbohydrate content and growth/stress-resistance traits.
摘要

在一个分离碳水化合物代谢的F(2)作图群体中，研究了果聚糖在多年生黑麦草（Lolium perenne）生长和干旱胁迫响应中的作用。采用数量性状位点方法比较性状的遗传控制。该群体内生长和干旱胁迫性状变异极大。大多数性状具有较高的广义遗传力。多数性状鉴定出了数量性状位点（QTL）；每个性状的QTL最多为4个。解释了总表型变异的11%至75%。很少有生长性状QTL与先前鉴定的果聚糖QTL重合。一组干旱性状QTL靠近基因组中两个先前鉴定的区域，这两个区域与分蘖基部果聚糖QTL呈互斥关系。高糖亲本贡献的等位基因很少能增加干旱胁迫期间“储备驱动”的生长或表现。生长和干旱胁迫性状与果聚糖含量的相关性较低，增加果聚糖含量本身似乎并不能提高抗旱性。细胞内碳水化合物分配和代谢的复杂模式可能解释了碳水化合物含量与生长/抗逆性状之间相互矛盾的关系。

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