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The Effects of Seed Size on Hybrids Formed Rape (Brassica Napus) and Wild Brown Mustard (B. Juncea)

机译：种子大小对杂交油菜（油菜）和野生芥菜（芥菜）的影响

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Background : Seed size has significant implications in ecology, because of its effects on plant fitness. The hybrid seeds that result from crosses between crops and their wild relatives are often small, and the consequences of this have been poorly investigated. Here we report on plant performance of hybrid and its parental transgenic oilseed rape (Brassica napus) and wild B. juncea, all grown from seeds sorted into three seed-size categories.[br/]Methodology/Principal Findings : Three seed-size categories were sorted by seed diameter for transgenic B. napus, wild B. juncea and their transgenic and non-transgenic hybrids. The seeds were sown in a field at various plant densities. Globally, small-seeded plants had delayed flowering, lower biomass, fewer flowers and seeds, and a lower thousand-seed weight. The seed-size effect varied among plant types but was not affected by plant density. There was no negative effect of seed size in hybrids, but it was correlated with reduced growth for both parents.[br/]Conclusions : Our results imply that the risk of further gene flow would probably not be mitigated by the small size of transgenic hybrid seeds. No fitness cost was detected to be associated with the Bt-transgene in this study.
机译：背景：种子大小因其对植物适应性的影响而在生态学中具有重要意义。作物与野生近缘种杂交产生的杂种种子通常很小，其后果尚未得到充分研究。在这里，我们报告了杂交种及其亲本转基因油菜（甘蓝型油菜）和野生芥菜的植物性能，它们都是从种子中生长的，分为三个种子大小类别。[br /]方法/主要发现：三个种子大小类别根据种子直径对转基因甘蓝型油菜，野生芥菜及其转基因和非转基因杂种进行分类。种子以不同的植物密度播种到田间。在全球范围内，小种子植物推迟了开花，生物量降低了，花和种子更少了，千粒重也降低了。种子大小效应随植物类型的不同而变化，但不受植物密度的影响。杂种中的种子大小没有负面影响，但是与父母双方的生长减少有关。[br /]结论：我们的结果表明，小尺寸的转基因杂种可能不会减轻进一步基因流动的风险。种子。在这项研究中，没有发现适合的成本与Bt转基因相关。

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