Scholes D R, Wszalek A E, Paige K N
Department of Biology, University of Indianapolis, Indianapolis, IN, USA.
School of Integrative Biology, University of Illinois at Urbana-Champaign, Urbana, IL, USA.
Plant Biol (Stuttg). 2016 Mar;18(2):239-48. doi: 10.1111/plb.12404. Epub 2015 Nov 2.
A plant's compensatory performance refers to its ability to maintain or increase its reproductive output following damage. The ability of a plant to compensate depends on numerous factors including the type, severity, frequency and timing of damage, the environmental conditions and the plant's genotype. Upon apical damage, a cascade of hormonal and genetic responses often produces dramatic changes in a plant's growth, development, architecture and physiology. All else being equal, this response is largely dependent on a plant's genotype, with different regrowth patterns displayed by different genotypes of a given species. In this study, we compare the architectural and growth patterns of two Arabidopsis thaliana genotypes following apical damage. Specifically, we characterise regrowth patterns of the genotypes Columbia-4 and Landsberg erecta, which typically differ in their compensation to apical meristem removal. We report that Landsberg erecta suffered reductions in the number of stems produced, maximum elongation rate, a delay in reaching this rate, lower average rosette quality throughout the growing period, and ultimately, less aboveground dry biomass and seed production when damaged compared to undamaged control plants. Columbia-4 had no reductions in any of these measures and maintained larger rosette area when clipped relative to when unclipped. Based on the apparent influence of the rosette on these genotypes' compensatory performances, we performed a rosette removal experiment, which confirmed that the rosette contributes to compensatory performance. This study provides a novel characterisation of regrowth patterns following apical damage, with insights into those measures having the largest effect on plant performance.
植物的补偿性能是指其在遭受损伤后维持或增加生殖输出的能力。植物的补偿能力取决于众多因素，包括损伤的类型、严重程度、频率和时间、环境条件以及植物的基因型。受到顶端损伤后，一系列激素和基因反应通常会使植物的生长、发育、结构和生理发生显著变化。在其他条件相同的情况下，这种反应很大程度上取决于植物的基因型，同一物种的不同基因型会表现出不同的再生模式。在本研究中，我们比较了两种拟南芥基因型在顶端损伤后的结构和生长模式。具体而言，我们对哥伦比亚-4和直立型兰茨贝格这两种基因型的再生模式进行了表征，它们在对顶端分生组织去除的补偿方面通常存在差异。我们报告称，与未受损的对照植株相比，直立型兰茨贝格在受损时产生的茎数减少、最大伸长率降低、达到该速率的时间延迟、整个生长期间莲座叶平均质量较低，最终地上部干生物量和种子产量也较少。哥伦比亚-4在这些指标上均未出现下降，并且在修剪后相对于未修剪时保持了更大的莲座叶面积。基于莲座叶对这些基因型补偿性能的明显影响，我们进行了一项去除莲座叶的实验，该实验证实莲座叶对补偿性能有贡献。这项研究对顶端损伤后的再生模式进行了新颖的表征，并深入了解了对植物性能影响最大的那些指标。
