Ji Hyo Seong, Hyun Tae Kyung
Cheongju, 28644 Republic of Korea Department of Industrial Plant Science and Technology, Chungbuk National University.
Physiol Mol Biol Plants. 2023 Apr;29(4):591-600. doi: 10.1007/s12298-023-01310-y. Epub 2023 Apr 29.
Waterlogging stress is a major limiting factor resulting in stunted growth and loss of crop productivity, especially for root crops. However, physiological responses to waterlogging have been studied in only a few plant models. To gain insight into how balloon flower ( () ) responds to waterlogging stress, we investigate changes to sucrose metabolism combined with a physiological analysis. Although waterlogging stress decreased the photosynthetic rate in balloon flower, leaves exhibited an increase in glucose (ninefold), fructose (4.7-fold), and sucrose (2.1-fold), indicating inhibition of sugar transport via the phloem. In addition, roots showed a typical response to hypoxia, such as the accumulation of proline (4.5-fold higher than in control roots) and soluble sugars (2.1-fold higher than in control roots). The activities and expression patterns of sucrose catabolizing enzymes suggest that waterlogging stress leads to a shift in the pathway of sucrose degradation from invertase to sucrose synthase (Susy), which consumes less ATP. Furthermore, we suggest that the waterlogging-stress-induced gene encodes the functional Susy enzyme, which may contribute to improving tolerance in balloon flower to waterlogging. As a first step toward understanding the waterlogging-induced regulatory mechanisms in balloon flower, we provide a solid foundation for further understanding waterlogging-induced alterations in source-sink relationships.
The online version contains supplementary material available at 10.1007/s12298-023-01310-y.
涝渍胁迫是导致作物生长发育不良和产量损失的主要限制因素，尤其是对块根作物而言。然而，仅在少数植物模型中研究了对涝渍的生理反应。为了深入了解桔梗（）如何应对涝渍胁迫，我们结合生理分析研究了蔗糖代谢的变化。尽管涝渍胁迫降低了桔梗的光合速率，但叶片中的葡萄糖（增加了9倍）、果糖（增加了4.7倍）和蔗糖（增加了2.1倍）含量却有所增加，这表明通过韧皮部的糖分运输受到了抑制。此外，根对缺氧表现出典型反应，例如脯氨酸积累（比对照根高4.5倍）和可溶性糖积累（比对照根高2.1倍）。蔗糖分解酶的活性和表达模式表明，涝渍胁迫导致蔗糖降解途径从转化酶转变为蔗糖合酶（Susy），后者消耗的ATP较少。此外，我们认为涝渍胁迫诱导基因编码功能性Susy酶，这可能有助于提高桔梗对涝渍的耐受性。作为理解桔梗涝渍诱导调控机制的第一步，我们为进一步了解涝渍诱导的源库关系变化提供了坚实的基础。
在线版本包含可在10.1007/s12298-023-01310-y获取的补充材料。
