D'Agostini Francesca, Vadez Vincent, Kholova Jana, Ruiz-Pérez Javier, Madella Marco, Lancelotti Carla
CaSEs Research Group, Department of Humanities, University Pompeu Fabra, c/Ramon Trias Fargas 25-27, 08005 Barcelona, Spain.
DIADE Unit, IRD, University of Montpellier, Av. Agropolis 911, 34394 Montpellier, France.
Plants (Basel). 2022 Apr 8;11(8):1019. doi: 10.3390/plants11081019.
Biosilica accumulation in plant tissues is related to the transpiration stream, which in turn depends on water availability. Nevertheless, the debate on whether genetically and environmentally controlled mechanisms of biosilica deposition are directly connected to water availability is still open. We aim at clarifying the system which leads to the deposition of biosilica in , , and , expanding our understanding of the physiological role of silicon in crops well-adapted to arid environments, and simultaneously advancing the research in archaeological and paleoenvironmental studies. We cultivated ten traditional landraces for each crop in lysimeters, simulating irrigated and rain-fed scenarios in arid contexts. The percentage of biosilica accumulated in leaves indicates that both well-watered millet species deposited more biosilica than the water-stressed ones. By contrast, sorghum accumulated more biosilica with respect to the other two species, and biosilica accumulation was independent of the water regime. The water treatment alone did not explain either the variability of the assemblage or the differences in the biosilica accumulation. Hence, we hypothesize that genetics influence the variability substantially. These results demonstrate that biosilica accumulation differs among and within C4 species and that water availability is not the only driver in this process.
植物组织中生物硅的积累与蒸腾流有关，而蒸腾流又取决于水分供应情况。然而，关于生物硅沉积的遗传和环境控制机制是否与水分供应直接相关的争论仍未解决。我们旨在阐明导致生物硅在[此处原文缺失具体植物名称]、[此处原文缺失具体植物名称]和[此处原文缺失具体植物名称]中沉积的系统，加深我们对硅在适应干旱环境的作物中的生理作用的理解，同时推动考古和古环境研究的进展。我们在蒸渗仪中为每种作物种植了十个传统地方品种，模拟干旱环境下的灌溉和雨养情景。叶片中积累的生物硅百分比表明，水分充足的谷子品种比水分胁迫的品种沉积的生物硅更多。相比之下，高粱相对于其他两个品种积累了更多的生物硅，且生物硅的积累与水分状况无关。仅水分处理既不能解释组合的变异性，也不能解释生物硅积累的差异。因此，我们假设遗传因素对变异性有很大影响。这些结果表明，C4物种之间以及物种内部的生物硅积累存在差异，并且水分供应不是这个过程的唯一驱动因素。
