中国农业科学 ›› 2008, Vol. 41 ›› Issue (6): 1583-1590 .doi: 10.3864/j.issn.0578-1752.2008.06.003

• 作物遗传育种·种质资源·分子遗传学 • 上一篇    下一篇

小麦2D染色体上多酚氧化酶(PPO)基因STS标记的开发与应用

王晓波,马传喜,何克勤,司红起,张业伦   

  1. 安徽农业大学农学院
  • 收稿日期:2007-03-20 修回日期:1900-01-01 出版日期:2008-06-10 发布日期:2008-06-10
  • 通讯作者: 马传喜

Allelic Variation of Wheat Polyphenol Oxidase (PPO) Genes and Its Effect on Polyphenol Oxidase Activity

  1. 安徽农业大学农学院
  • Received:2007-03-20 Revised:1900-01-01 Online:2008-06-10 Published:2008-06-10

摘要: 【目的】开发出小麦籽粒PPO活性的分子标记,并对新标记的应用进行研究,为面制食品外观品质的改良提供参考。【方法】根据一条由小麦2D染色体上PPO基因编码的mRNA序列(GenBank:AY515506)设计引物,对7个高PPO活性和7个低PPO活性小麦品种进行PCR扩增,筛选出有差异的引物,对130份小麦品种资源进行检测,验证不同带型与PPO活性的相关性,并利用一套中国春缺体、四体及双端体对STS标记进行染色体定位。在此基础上,结合一个位于小麦2A染色体上的PPO基因分子标记(PPO18),对新开发的标记在小麦低PPO活性分子标记辅助选择中的作用进行评价。【结果】在AY515506的不同位置共设计了8对引物,其中一对引物(STS01)在高、低PPO活性材料中表现出多态性。该引物在7个低PPO活性的材料中能扩增出560 bp的目标片段,在7个高PPO活性的材料中没有扩增出目标片段,利用中国春缺体、四体及双端体最终将该标记定位在2D染色体长臂上。利用该标记检测130份小麦品种,结果表明有75个品种可以扩增出560 bp的目标片段,其PPO活性均值为221.08 A475/(min•g•103);55个品种没有扩增出目标片段,PPO活性均值为309.98 A475/(min•g•103),方差分析表明两者的差异达极显著水平(P<0.01)。利用STS01和PPO18共同检测后发现,130份品种中,有37个品种的双标记扩增均表现出高活性带型(H1H2),这些品种PPO活性的均值为337.82 A475/(min•g•103),显著高于其它几种扩增带型品种的PPO活性均值(P<0.01)。32个双标记扩增均表现为低活性带型(L1L2)的小麦品种PPO活性值普遍较低,可作为改良面制食品外观品质的候选亲本。【结论】STS01是一个位于小麦2D染色体长臂上PPO基因分子标记,可以在小麦PPO活性分子标记辅助选择中加以应用。

关键词: 小麦, 多酚氧化酶活性, STS标记, 分子标记辅助育种

Abstract: 【Objective】The enzyme activity of polyphenol oxidase (PPO) in grain has been closely related to the brown discoloration of wheat (Triticum aestivum L.) based end-products, particularly for fresh noodles. The allelic variation of PPO genes on chromosome 2A and 2D and its effect on PPO activity were detected for improvement of the appearance quality of wheat based end-products and MAS for low PPO activity.【Method】One STS marker PPO18, which was located on wheat chromosome 2A and STS01 designed from a mRNA sequence (Genbank: AY515506) in this study, which was located on chromosome 2D were used to study the allelic variation of different PPO genes and its effect on PPO activity using 130 cultivars, which the PPO activity was measured in each of two crop seasons.【Result】The results showed that PPO alleles L1 and H1 at the STS01 locus and alleles L2 and H2 at PPO18 locus gave significantly different effect on wheat kernel PPO activity. The cultivars with allele STS01-H1 and PPO18-H2 had greater (P<0.01) PPO activity than the cultivars with STS01-L1 and PPO18-L2, meanwhile 32 cultivars with L1L2 gene gave very low PPO activity mostly. Allelic variation at STS01 and PPO18 loci can explain 63.06% of phenotypic variance for PPO activity. The effect of PPO genes on chromosome 2A and 2D on PPO activity appears cumulative. 【Conclusion】Wheat PPO activity was mainly effected by two PPO genes located on chromosome 2A and 2D. Using STS markers PPO18 and STS01 together in MAS could improve the effect of selection obviously in breeding program for low PPO activity.

Key words: Wheat (Triticum aestivum L.), Polyphenol oxidase activity, STS molecular marker, Alleic variation