Panicle removal delays plant senescence and enhances vegetative growth improving biomass production in switchgrass

文献类型： 外文期刊

第一作者： Zhao, Chunqiao

作者： Zhao, Chunqiao;Yue, Yuesen;Wu, Juying;Guo, Qiang;Wang, Qinghai;Li, Cui;Hou, Xincun;Fan, Xifeng;Scullion, John;Wan, Xiuyun

作者机构：

关键词： Switchgrass; Panicle removal; 13 C -labeling; Biomass weight; Plant senescence

期刊名称：BIOMASS & BIOENERGY （ 影响因子：6.0； 五年影响因子：5.3 ）

ISSN： 0961-9534

年卷期： 2023 年 174 卷

页码：

收录情况： SCI

摘要： Switchgrass (Panicum virgatum L.) shows great bioenergy potential and provides multiple ecological services. However, its severe seed shedding causes biomass waste and seed diffusion risk. Questions arise as to the pro-duction performance of switchgrass after panicle removal (PR), which remains unknown. We revealed switch -grass growth responses to PR and illustrated physiological reasons. Compared to the untreated switchgrass, PR significantly stimulated stem elongation (32.13%) and increased tiller number (39.70%), as well as aboveground biomass (24.69%). Importantly, PR significantly increased contents of nonstructural carbohydrates (NSCs) in the stem, which was directly beneficial to the ethanol conversion, and in the rhizome and root. The chlorophyll contents, net photosynthetic efficiency, and photochemical quantum efficiencies of flag leaf increased signifi-cantly. PR switchgrass allocated more assimilates into the stem, root, rhizome, and NSCs. Activities of phos-phoenolpyruvate carboxylase, ribulose-1, 5-diphosphate carboxylase, sucrose phosphate synthase (SPS) in flag leaf and adenosine diphosphate glucose pyrophosphorylase (AGPase) and SPS in the stem and rhizome all increased significantly. In contrast, activities of the AGPase in flag leaf and sheath decreased significantly. Contents of zeatin nucleoside, gibberellins, and indoleacetic acid in flag leaf, stem, and rhizome all increased. Abscisic acid contents in flag leaf and stem decreased significantly while increased significantly in the rhizome. In conclusion, growth-promoting hormones delayed plant senescence, enhanced leaf photosynthesis, and enhanced vegetative growth through regulating assimilates-metabolism-related enzymes, which increased biomass accumulation in PR switchgrass. This work provided new insights for yield and digestibility improve-ment in switchgrass through field management practices, hormones regulation, or genetic modification strategies.

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