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The draft genome of the transgenic tropical fruit tree papaya (Carica papaya Linnaeus)

机译：转基因热带果树番木瓜（Carica papaya Linnaeus）的基因组草图

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Papaya, a fruit crop cultivated in tropical and subtropical regions, is known for its nutritional benefits and medicinal applications. Here we report a 3× draft genome sequence of 'SunUp' papaya, the first commercial virus-resistant transgenic fruit tree to be sequenced. The papaya genome is three times the size of the Arabidopsis genome, but contains fewer genes, including significantly fewer disease-resistance gene analogues. Comparison of the five sequenced genomes suggests a minimal angiosperm gene set of 13,311. A lack of recent genome duplication, atypical of other angiosperm genomes sequenced so far, may account for the smaller papaya gene number in most functional groups. Nonetheless, striking amplifications in gene number within particular functional groups suggest roles in the evolution of tree-like habit, deposition and remobilization of starch reserves, attraction of seed dispersal agents, and adaptation to tropical daylengths. Transgenesis at three locations is closely associated with chloro-plast insertions into the nuclear genome, and with topoisomerase I recognition sites. Papaya offers numerous advantages as a system for fruit-tree functional genomics, and this draft genome sequencernprovides the foundation for revealing the basis of Carica's distinguishing morpho-physiological, medicinal and nutritional properties.
机译：木瓜是一种在热带和亚热带地区种植的水果作物，以其营养价值和药用价值而闻名。在这里，我们报告了“ SunUp”木瓜的3倍基因组序列草案，这是第一个要测序的商业抗病毒转基因果树。木瓜基因组的大小是拟南芥基因组的三倍，但包含的基因较少，包括抗病基因类似物明显较少。五个测序的基因组的比较表明，最小的被子植物基因组为13,311。缺乏最新的基因组重复（到目前为止尚未测序的其他被子植物基因组是非典型的），可以解释大多数功能组中番木瓜基因数目较小的问题。但是，特定功能组内基因数目的惊人扩增表明在树样习性的进化，淀粉储备的沉积和迁移，种子分散剂的吸引以及对热带白天的适应中发挥了作用。在三个位置的转基因与叶绿体插入核基因组以及拓扑异构酶I识别位点密切相关。木瓜作为果树功能基因组学系统具有许多优势，而该基因组序列草案为揭示Carica独特的形态生理，医学和营养特性奠定了基础。

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