INRA, Laboratoire d'Ecophysiologie des Plantes sous Stress Environnementaux, Place Viala, F-34060, Montpellier Cedex 1, France.
Plant Cell Environ. 2013 Jun;36(6):1105-19. doi: 10.1111/pce.12045. Epub 2013 Jan 7.
We have tested to what extent the growth ability of several organs of maize share a common genetic control. Every night, leaf elongation rate reaches a maximum value (LERmax ) that has a high heritability, is repeatable between experiments and is correlated with final leaf length. Firstly, we summarized quantitative trait loci (QTLs) of LERmax and of leaf length in three mapping populations. Among the 14 consensus QTLs (cQTLs) of leaf length, seven co-located with cQTLs of LERmax with consistent allelic effects. Nine cQTLs of LERmax (4% of the genome) were highly reliable and confirmed by introgression lines. We then compared these QTLs with those affecting the growths of leaves, shoots, roots or young reproductive organs, detected with the same mapping populations in three field experiments or in literature datasets. Five of the nine most reliable cQTLs of LERmax co-located with QTLs involved in the growth of other organs (but not in flowering time) with consistent allelic effects. Reciprocally, two-thirds of the 20 QTLs of growth of different organs co-located with cQTLs of LERmax . Hence, LERmax , as determined in a phenotyping platform, is an indicator of the growth ability of other organs of the plant in controlled or in-field conditions.
我们已经测试了玉米的几个器官的生长能力在多大程度上共享共同的遗传控制。每天晚上，叶片伸长率达到最大值（LERmax），该最大值具有高遗传力，在实验之间可重复，并且与最终叶片长度相关。首先，我们总结了三个图谱群体中 LERmax 和叶片长度的数量性状基因座（QTL）。在 14 个叶片长度的一致性 QTL（cQTL）中，有 7 个与 LERmax 的 cQTL 共定位，具有一致的等位基因效应。9 个 LERmax 的 cQTL（占基因组的 4%）非常可靠，并通过导入系得到了证实。然后，我们将这些 QTL 与使用相同图谱群体在三个田间试验或文献数据集检测到的影响叶片、茎、根或幼嫩生殖器官生长的 QTL 进行了比较。在九个最可靠的 LERmax cQTL 中，有五个与涉及其他器官生长的 QTL （但不涉及开花时间）共定位，具有一致的等位基因效应。相反，三分之二的不同器官生长的 20 个 QTL 与 LERmax 的 cQTL 共定位。因此，在表型平台上确定的 LERmax 是植物在受控或田间条件下其他器官生长能力的指标。
