Plant Molecular Biology Unit, Biochemical Sciences Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411008, Maharashtra, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, Uttar Pradesh, India.
Plant Molecular Biology Unit, Biochemical Sciences Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411008, Maharashtra, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, Uttar Pradesh, India.
Plant Sci. 2021 May;306:110854. doi: 10.1016/j.plantsci.2021.110854. Epub 2021 Feb 18.
Many tuber and storage root crops owing to their high nutritional values offer high potential to overcome food security issues. The lack of information regarding molecular mechanisms that govern belowground storage organ development (except a tuber crop, potato) has limited the application of biotechnological strategies for improving storage crop yield. Phytohormones like gibberellin and cytokinin are known to play a crucial role in governing potato tuber development. Another phytohormone, auxin has been shown to induce tuber initiation and growth, and its crosstalk with gibberellin and strigolactone in a belowground modified stem (stolon) contributes to the overall potato tuber yield. In this review, we describe the crucial role of auxin biology in development of potato tubers. Considering the emerging reports from commercially important storage root crops (sweet potato, cassava, carrot, sugar beet and radish), we propose the function of auxin and related gene regulatory network in storage root development. The pattern of auxin content of stolon during various stages of potato tuber formation appears to be consistent with its level in various developmental stages of storage roots. We have also put-forward the potential of three-way interaction between auxin, strigolactone and mycorrhizal fungi in tuber and storage root development. Overall, we propose that auxin gene regulatory network and its crosstalk with other phytohormones in stolons/roots could govern belowground tuber and storage root development.
许多块茎和块根作物由于其高营养价值，具有很高的潜力来克服粮食安全问题。缺乏关于控制地下贮藏器官发育的分子机制的信息（除了块茎作物马铃薯），限制了生物技术策略在提高贮藏作物产量中的应用。植物激素如赤霉素和细胞分裂素被认为在控制马铃薯块茎发育中起着至关重要的作用。另一种植物激素生长素已被证明能诱导块茎的起始和生长，它与赤霉素和独脚金内酯在下地改良茎（匍匐茎）中的相互作用有助于马铃薯块茎的整体产量。在这篇综述中，我们描述了生长素生物学在马铃薯块茎发育中的关键作用。考虑到来自商业上重要的块根作物（甘薯、木薯、胡萝卜、甜菜和萝卜）的新兴报告，我们提出了生长素及其相关基因调控网络在块根发育中的功能。在马铃薯块茎形成的各个阶段，匍匐茎中的生长素含量模式似乎与其在块根发育的各个阶段的水平一致。我们还提出了生长素、独脚金内酯和菌根真菌在块茎和块根发育中的三向相互作用的潜力。总的来说，我们提出生长素基因调控网络及其与匍匐茎/根中的其他植物激素的相互作用可以控制地下块茎和块根的发育。
