Graduate School of Science and Technology, Niigata University, Ikarashi, Niigata 950-2181, Japan.
Graduate School of Science and Technology, Niigata University, Ikarashi, Niigata 950-2181, Japan; Department of Biology, Faculty of Science, Niigata University, Ikarashi, Niigata 950-2181, Japan.
J Plant Physiol. 2014 Feb 15;171(3-4):205-12. doi: 10.1016/j.jplph.2013.07.005. Epub 2013 Aug 21.
Poor nutrition and low temperature stress treatments induced flowering in the Japanese morning glory Pharbitis nil (synonym Ipomoea nil) cv. Violet. The expression of PnFT2, one of two homologs of the floral pathway integrator gene FLOWERING LOCUS T (FT), was induced by stress, whereas the expression of both PnFT1 and PnFT2 was induced by a short-day treatment. There was no positive correlation between the flowering response and the homolog expression of another floral pathway integrator gene SUPPRESSOR OF OVEREXPRESSION OF CO1 and genes upstream of PnFT, such as CONSTANS. In another cultivar, Tendan, flowering and PnFT2 expression were not induced by poor nutrition stress. Aminooxyacetic acid (AOA), a phenylalanine ammonia-lyase inhibitor, inhibited the flowering and PnFT2 expression induced by poor nutrition stress in Violet. Salicylic acid (SA) eliminated the inhibitory effects of AOA. SA enhanced PnFT2 expression under the poor nutrition stress but not under non-stress conditions. These results suggest that SA induces PnFT2 expression, which in turn induces flowering; SA on its own, however, may not be sufficient for induction.
不良的营养和低温胁迫处理诱导日本牵牛 Pharbitis nil（同义词 Ipomoea nil）cv. 紫罗兰开花。花途径整合基因 FLOWERING LOCUS T (FT) 的两个同源物之一 PnFT2 的表达受到胁迫诱导，而 PnFT1 和 PnFT2 的表达均受到短日照处理的诱导。另一个花途径整合基因 SUPPRESSOR OF OVEREXPRESSION OF CO1 和 PnFT 上游基因，如 CONSTANS 的同源表达与开花反应之间没有正相关关系。在另一个品种 Tendan 中，不良营养胁迫并未诱导开花和 PnFT2 的表达。苯氧乙酸（AOA），一种苯丙氨酸解氨酶抑制剂，抑制紫罗兰中不良营养胁迫诱导的开花和 PnFT2 的表达。水杨酸（SA）消除了 AOA 的抑制作用。SA 在不良营养胁迫下增强 PnFT2 的表达，但在非胁迫条件下则不会。这些结果表明，SA 诱导 PnFT2 的表达，进而诱导开花；然而，SA 本身可能不足以诱导开花。
