INRAE UR1115 Plantes et Systèmes de culture Horticoles - Site Agroparc, F-84914 Avignon, France; Université Montpellier-CNRS, Laboratoire Charles Coulomb UMR 5221, F-34095 Montpellier, France.
UMR AGAP, CIRAD, Montpellier, France.
Plant Sci. 2022 Aug;321:111313. doi: 10.1016/j.plantsci.2022.111313. Epub 2022 May 14.
The growth and composition of fleshy fruits depend on resource acquisition and distribution in the plant. In tomato, the pedicel serves as the final connection between plant and fruit. However, very few quantitative data are available for the conducting tissues of the pedicel, nor is their genetic variability known. In the present study, a histological approach was combined with process-based modeling to evaluate the potential contribution made by the anatomy and histology of the pedicel to variations in fruit mass. Eleven genotypes were characterized and the impact of water deficit was studied for a single genotype using stress intensity and stage of application as variables. The results highlighted extensive variations in the relative proportions of the different pedicel tissues and in the absolute areas of xylem and phloem between genotypes. The model suggests that the variations in the area of the pedicel's vascular tissues induced by differences in genotype and water-deficit environments partly contributed to fruit mass variability. They therefore warrant phenotyping for use in the development of plant strains adapted to future environmental constraints. The results also demonstrated the need to develop non-invasive in vivo measurement methods to establish the number and size of active vessels and the flow rates in these vessels to improve prediction of water fluxes in plant architecture.
肉质果实的生长和组成取决于植物中资源的获取和分配。在番茄中，花梗是植物和果实之间的最后连接。然而，关于花梗的输导组织，几乎没有定量数据，其遗传变异性也未知。在本研究中，采用组织学方法结合基于过程的建模来评估花梗的解剖结构和组织学对果实质量变化的潜在贡献。对 11 个基因型进行了特征描述，并使用胁迫强度和应用阶段作为变量研究了单一基因型对水分亏缺的影响。结果突出了不同花梗组织的相对比例以及基因型之间木质部和韧皮部绝对面积的广泛变化。该模型表明，由基因型和水分亏缺环境差异引起的花梗维管束组织面积的变化部分导致了果实质量的变异性。因此，有必要对其进行表型分析，以开发适应未来环境限制的植物品系。研究结果还表明，需要开发非侵入性的活体测量方法，以确定活跃血管的数量和大小以及这些血管中的流速，从而提高对植物结构中水流的预测能力。
