Guo Chunlin, Lin Weiwei, Gao Wujie, Lan Chaojie, Xu Hailong, Zou Jingnan, Fallah Nyumah, Wang Wenfei, Lin Wenfang, Chen Ting, Lin Wenxiong
Fujian Key Laboratory for Crop Physiology and Molecular Ecology, College of Agriculture, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
Fujian Key Laboratory for Agroecological Processes and Safety Monitoring, College of Ecology, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
Plants (Basel). 2023 Nov 20;12(22):3910. doi: 10.3390/plants12223910.
Crop perennialization has garnered global attention recently due to its role in sustainable agriculture. However, there is still a lack of detailed information regarding perennial rice's regenerative characteristics and physiological mechanisms in crop ratooning systems with different rice stubble heights. In addition, the response of phytohormones to varying stubble heights and how this response influences the regenerative characteristics of ratoon rice remains poorly documented. Here, we explored the regenerative characteristics and physiological mechanisms of an annual hybrid rice, AR2640, and a perennial rice, PR25, subjected to different stubble heights (5, 10, and 15 cm). The response of phytohormones to varying stubble heights and how this response influences the regenerative characteristics of ratoon rice were also investigated. The results show that PR25 overwintered successfully and produced the highest yield, especially in the second ratoon season, mainly due to its extended growth duration, higher number of mother stems, tillers at the basal nodes, higher number of effective panicles, and heavier grain weight when subjected to lower stubble heights. Further analysis revealed that PR25 exhibited a higher regeneration rate from the lower-position nodes in the stem with lower stubble heights. this was primarily due to the higher contents of phytohormones, especially auxin (IAA) and gibberellin (GA) at an early stage and abscisic acid (ABA) at a later stage after harvesting of the main crop. Our findings reveal how ratoon rice enhances performance based on different stubble heights, which provides valuable insights and serves as crucial references for delving deeper into cultivating high-yielding perennial rice.
由于其在可持续农业中的作用，作物多年生化最近已引起全球关注。然而，关于多年生水稻在不同稻茬高度的作物再生系统中的再生特性和生理机制，仍然缺乏详细信息。此外，植物激素对不同茬高的反应以及这种反应如何影响再生稻的再生特性，仍鲜有文献记载。在此，我们探究了一年生杂交稻AR2640和多年生稻PR25在不同茬高（5厘米、10厘米和15厘米）下的再生特性和生理机制。我们还研究了植物激素对不同茬高的反应以及这种反应如何影响再生稻的再生特性。结果表明，PR25成功越冬且产量最高，尤其是在第二季再生季，这主要归因于其生育期延长、母茎数量更多、基部节位分蘖更多、有效穗数更多以及在较低茬高下粒重更重。进一步分析表明，PR25在较低茬高下从茎的较低位置节位表现出更高的再生率。这主要是由于在主作物收获后的早期植物激素含量较高，尤其是生长素（IAA）和赤霉素（GA），后期脱落酸（ABA）含量较高。我们的研究结果揭示了再生稻如何基于不同茬高提高性能，这为深入研究高产多年生水稻栽培提供了有价值的见解并作为关键参考。
