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摘要 : 2017年5月18日,国际著名学术杂志《Cell》杂志在线发表了美国冷泉港实验室Zachary B. Lippman研究员的一篇研究论文,研究报道了让番茄产量几乎翻倍的方法。

2017年5月18日,国际著名学术杂志《Cell》杂志在线发表了美国冷泉港实验室Zachary B. Lippman研究员的一篇研究论文,研究报道了让番茄产量几乎翻倍的方法。尽管大部分人关注的主要是玉米或番茄的大小和口味,但培育者还关心这些植物如何生长,例如能极大影响果实数量的茎干的分支模式,或者果实收获的难易程度。





Bypassing Negative Epistasis on Yield in Tomato Imposed by a Domestication Gene


selecion for inflorescence architecture with improved flower production and yield is common to many domesticated crops. However, tomato inflorescences resemble wild ancestors, and breeders avoided excessive branching because of low fertility. We found branched variants carry mutations in two related transcription factors that were selected independently. One founder mutation enlarged the leaf-like organs on fruits and was selected as fruit size increased during domestication. The other mutation eliminated the flower abscission zone, providing “jointless” fruit stems that reduced fruit dropping and facilitated mechanical harvesting. Stacking both beneficial traits caused undesirable branching and sterility due to epistasis, which breeders overcame with suppressors. However, this suppression restricted the opportunity for productivity gains from weak branching. Exploiting natural and engineered alleles for multiple family members, we achieved a continuum of inflorescence complexity that allowed breeding of higher-yielding hybrids. Characterizing and neutralizing similar cases of negative epistasis could improve productivity in many agricultural organisms.

来源: Cell 浏览次数:0


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