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Growth, root respiration and photosynthesis of a root-sprouting short-lived herb after severe biomass removal
Flora ( IF 1.9 ) Pub Date : 2021-09-06 , DOI: 10.1016/j.flora.2021.151915
Jana Martínková 1 , Tomáš Hájek 1, 2 , Lubomír Adamec 1 , Jitka Klimešová 1, 3
Affiliation  

The predominance of short-lived species in disturbed habitats supports the view that generative regeneration is an advantageous strategy under these conditions. However, there are short-lived species that survive the destruction of aboveground biomass and resprout from roots. Yet, there is only limited knowledge on the effect of injury on the plant growth of individuals regrowing from roots, and nearly no research has been conducted on the physiological regulation of root-sprouting.

We experimentally tested the effect of total shoot biomass removal on the growth, root respiration and photosynthesis of the short-lived, root-sprouting herb Barbarea vulgaris (Brassicaceae) to assess the efficiency and importance of the root sprouting ability.

Regenerating plants compensated for the loss of photosynthetic area by producing a higher number of leaves with higher SLA, but we did not observe compensatory photosynthesis, which could potentially counterbalance the loss of photosynthetic area and allow accelerated growth. The root respiration rate significantly decreased immediately after injury and then slightly and consequentially increased. The belowground biomass of the injured plants decreased by more than four times a month after the injury comparing to the biomass measured immediately after the disturbance. This result suggests the intensive consumption of reserves located in roots, although the root respiration values did not indicate it.

Although we found physiological constraints that limited more vigorous resprouting, we conclude that the root-sprouting ability of short-lived species represents a useful strategy for population persistence in frequently disturbed habitats, in places lacking seed banks or when disturbances occur during less-than-suitable germination conditions.



中文翻译:

生物质严重去除后发根短命草本植物的生长、根呼吸和光合作用

受干扰栖息地中短寿命物种的优势支持了这样一种观点,即在这些条件下,生成再生是一种有利的策略。然而,有些短命的物种在地上生物量的破坏中幸存下来并从根部重新发芽。然而,关于损伤对从根再生的个体的植物生长的影响的知识有限,并且几乎没有对根发芽的生理调节进行研究。

我们通过实验测试了总芽生物量去除对短命根发芽草本植物 Barbarea vulgaris(十字花科)的生长、根呼吸和光合作用的影响,以评估根发芽能力的效率和重要性。

再生植物通过产生更多具有更高 SLA 的叶子来补偿光合面积的损失,但我们没有观察到补偿性光合作用,这可能会抵消光合面积的损失并加速生长。根系呼吸率在损伤后立即显着降低,然后略微增加。与干扰后立即测量的生物量相比,受伤植物的地下生物量在受伤后一个月减少了四倍以上。这一结果表明位于根部的储备的密集消耗,尽管根部呼吸值没有表明这一点。

尽管我们发现生理上的限制限制了更旺盛的再发芽,但我们得出结论,短命物种的根发芽能力代表了在经常受到干扰的栖息地、缺乏种子库的地方或在少于适宜的发芽条件。

更新日期:2021-09-13
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