Shoot growth directly impacts plant productivity. Plants adjust their shoot growth in response to varying environments to maximize resource capture and stress resilience. While several factors controlling shoot growth are known, the complexity of the regulation and the input of the environment are not fully understood. We have investigated shoot growth repression induced by low ambient temperatures in hybrids of Arabidopsis thaliana Kro-0 and BG-5 accessions. To continue our previous studies, we confirmed that the Kro-0 allele of DYNAMIN-RELATED PROTEIN 3B (DRP3B) causes stunted shoot growth in the BG-5 background. We also found that shoot growth repression was most pronounced near the apex at a lower temperature, and that the cells in the hybrid stem failed to elongate correctly. Furthermore, we observed that shoot growth repression in hybrids depended on light availability. Global gene expression analysis indicated the involvement of hormones, especially strigolactone, associated with the dwarf phenotype. Altogether, this study enhances our knowledge on the genetic, physiological, and environmental factors associated with shoot growth regulation.

中文翻译：

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详细描述拟南芥 Kro-0 x BG-5 杂交种的早期芽生长停滞

芽的生长直接影响植物的生产力。植物根据不同的环境调整芽的生长，以最大限度地提高资源捕获和抗逆能力。虽然控制芽生长的几个因素是已知的，但调节的复杂性和环境的输入尚不完全清楚。我们研究了拟南芥 Kro-0 和 BG-5 品种的杂交种中低环境温度引起的芽生长抑制。为了继续我们之前的研究，我们证实动态相关蛋白 3B (DRP3B) 的 Kro-0 等位基因会导致 BG-5 背景下芽生长发育不良。我们还发现，在较低温度下，芽生长抑制在顶端附近最为明显，并且杂种茎中的细胞无法正确伸长。此外，我们观察到杂交种芽生长的抑制取决于光的可用性。整体基因表达分析表明激素，尤其是独脚金内酯，与矮化表型相关。总而言之，这项研究增强了我们对与芽生长调节相关的遗传、生理和环境因素的了解。