The use of rutabaga for increasing the level of heterosis in spring canola was investigated. For this, test hybrids were produced by crossing four inbred populations, derived from F₂ and BC₁ of two rutabaga × spring canola crosses, to their spring canola parent, and were tested in field‐plots for agronomic and seed quality traits. Average mid‐parent heterosis (MPH) in these test hybrid populations was about 5%‐15% for yield. Compared to the F₂‐derived population, the BC₁‐derived population exhibited 1.8‐times greater MPH for yield. No correlation was found between inbred and test hybrid for yield; however, a positive correlation of genetic diversity of the inbred lines was found with MPH (r = .58) and hybrid yield (r = .36) suggesting that non‐additive effect of the genes may play an important role for high yield in hybrids. About 2% negative MPH was found for days to flowering, while almost no heterosis was found for seed oil and protein contents. Thus, our study demonstrates the potential of the rutabaga gene pool for use in hybrid canola breeding.

中文翻译：

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大头菜（甘蓝型油菜var.napobrassica）基因库在杂交春季甘蓝型油菜育种中的潜力

研究了大头菜在春季油菜中提高杂种优势水平的用途。为此，将两个大头菜×春季双低油菜杂交的F ₂和BC ₁的四个近交种群杂交到其春季双低油菜的亲本中，从而产生了测试杂交种，并在田间试验中测试了农艺和种子品质性状。在这些测试杂种群体中，平均亲本杂种优势（MPH）的产量约为5％-15％。与F ₂来源的种群相比，BC ₁来源的种群表现出更高的MPH 1.8倍。在自交系和测试杂种之间未发现产量相关性。然而，发现自交系的遗传多样性与MPH呈正相关（r = .58）和杂种产量（r  = .36），表明基因的非累加效应可能对杂种的高产起重要作用。开花后数天内发现约2％的MPH阴性，而种子油和蛋白质含量几乎未发现杂种优势。因此，我们的研究证明了大头菜基因库在杂交油菜育种中的潜力。