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首页> 外文期刊>Acta Horticulturae >Practical use of QTLs associated with yield and fruit quality in tomato.
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Practical use of QTLs associated with yield and fruit quality in tomato.

机译：与番茄产量和果实品质相关的QTL的实际使用。

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摘要

Tomato cultivars can principally affect product quality. Therefore, in tomato breeding programmes, improving fruit quality attributes such as flavour, fruit colour and nutritional values has been emphasized along with many traits of economic importance such as yield and earliness. However, such traits have been difficult to improve since they are governed by quantitative trait loci (QTL). We have introgressed into NDM breeding lines two DNA segments from two tomato wild species, Lycopersicon pennellii and L. chmielewskii. One QTL (dw1) derived from L. pennelii was closely associated with a phenotype of increasing yield and earliness but decreasing fruit firmness, while the other QTL (hs1a) derived from L. chmielewskii was associated with increasing soluble solids of fruits but reducing yield and internal fruit colour. To improve those undesirable characteristics closely linked with dw1 and hs1a, we have sequentially backcrossed dw1 and hs1a lines to several breeding lines with different genetic backgrounds. In one of our commercial cultivars, DR447, dw1 dramatically increased earliness. The ratio of the first two harvests to the total yield was 20% more in dw1/+ lines than in +/+ ones. The total yield was slightly increased in dw1/+ lines compared to +/+ lines. In hs1a lines undesirable characteristics such as inferior fruit colour were also improved only in a particular genetic background. This implies that putative QTL that improved fruit colour mainly in columella tissue may exist in the genetic background..
机译：番茄品种可能主要影响产品质量。因此，在番茄育种计划中，强调了改善果实品质的属性，例如风味，果实颜色和营养价值，以及许多具有经济重要性的特征，例如产量和早产。但是，由于这些性状受数量性状基因座（QTL）支配，因此很难加以改进。我们已经将来自两种野生番茄番茄（Lycopersicon pennellii和L. chmielewskii）的两个DNA片段引入到NDM育种系中。一个来自L. pennelii的QTL（dw1）与增加产量和早熟但降低果实硬度的表型密切相关，而另一个来自L. chmielewskii的QTL（hs1a）与增加果实的可溶性固形物但降低产量和内部水果色。为了改善与dw1和hs1a紧密相关的不良特性，我们将dw1和hs1a系依次回交到具有不同遗传背景的几个育种系。在我们的一种商业品种DR447中，dw1大大提高了早产。 dw1 / +品系的前两次收获占总产量的比率比+ / +品系高出20％。与+/-品系相比，dw1 / +品系的总产量略有增加。在hs1a品系中，仅在特定的遗传背景下也改善了不良特性，例如劣等的果实颜色。这暗示可能主要在小肠组织中改善果实颜色的推定QTL可能存在于遗传背景中。

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