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首页> 外文期刊>Plant Physiology and Biochemistry >Early growth promotion and leaf level physiology changes in Burkholderia phytofirmans strain PsJN inoculated switchgrass
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Early growth promotion and leaf level physiology changes in Burkholderia phytofirmans strain PsJN inoculated switchgrass

机译：伯克霍尔德氏菌植物PsJN接种柳枝holder的早期生长促进和叶水平生理变化

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摘要

Switchgrass (SG) is one of the most promising next generation biofuel crops in North America. Inoculation with bacterial endophytes has improved growth of several plant species. Our study demonstrated that Burkholderia phytofirmans strain PsJN, a well-studied plant growth promoting rhizo-bacterium (PGPR) significantly increased both aboveground and belowground biomass (DW) and promoted elongation of root, stem and leaf within 17 days following inoculation. Furthermore, the enhanced root growth in PsJN inoculated plants lagged behind the shoot response, resulting in greater allocation to aboveground growth (p = 0.0041). Lower specific root length (SRL, p = 0.0158) and higher specific leaf weight (SLW, p = 0.0029) were also observed in PsJN inoculated seedlings, indicating changes in development. Photosynthetic rates (Ps) were also significantly higher in PsJN inoculated seedlings after 17 days (54%, p = 0.0016), and this occurred initially without increases in stomatal conductance resulting in significantly greater water use efficiency (WUE, 37.7%, p = 0.0467) and lower non-stomatal limitation (LNS, 29.6%, p = 0.0222). These rapid changes in leaf level physiology are at least partially responsible for the growth enhancement due to PsJN. (C) 2014 Elsevier Masson SAS. All rights reserved.
机译：柳枝（（SG）是北美最有希望的下一代生物燃料作物之一。细菌内生菌接种可以改善几种植物的生长。我们的研究表明，Burkholderia phytofirmans菌株PsJN，经过充分研究的植物生长促进根瘤菌（PGPR），可在接种后17天内显着增加地上和地下生物量（DW），并促进根，茎和叶的伸长。此外，接种PsJN的植物增强的根部生长滞后于芽响应，导致对地上生长的分配更大（p = 0.0041）。在PsJN接种的幼苗中还观察到较低的比根长（SRL，p = 0.0158）和较高的比叶重（SLW，p = 0.0029），表明发育变化。接种PsJN的幼苗在17天后的光合速率（Ps）也显着更高（54％，p = 0.0016），并且最初发生时气孔导度没有增加，从而导致用水效率显着提高（WUE，37.7％，p = 0.0467） ）和较低的非气孔限制（LNS，29.6％，p = 0.0222）。叶水平生理的这些快速变化至少部分归因于PsJN的生长增强。 （C）2014 Elsevier Masson SAS。版权所有。

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