*121.Passage 1 How does a single somatic cell develop into a complete plant? This was one of the world's major challenges listed by Science magazine in 2005. Recently, a team led by Shandong Agricultural University published findings in Cell, for the first time fully revealing the entire process of how a plant somatic cell "changes its fate" through gene reprogramming to develop into a complete plant. Plant cells have a strong "regeneration" ability and can develop into embryos without fertilization, known as "somatic embryogenesis". In 1902, scientists proposed the concept of "plant cell totipotency", referring to how somatic cells can dedifferentiate to form totipotent stem cells, which then develop into complete plants. This phenomenon (like a succulent leaf sprouting a new plant) is common, but its molecular mechanism has remained unsolved. Starting in 2005, Professor Zhang Xiansheng's team, using Arabidopsis thaliana as a model, established a stable system for inducing single-cell "somatic embryogenesis" and discovered that a massive accumulation of auxin is the "switch" that activates cell totipotency. The team further identified the "molecular switch" that triggers totipotency: the synergistic action of the gene SPCH (specific to leaf stomatal precursor cells) and the artificially high-expressed gene LEC2. The paper's first author, Tang Liping, explained that the "precursor cell", originally destined to become a stoma, activates the auxin synthesis pathway under the synergistic effect of LEC2 and SPCH. This leads to a massive accumulation of auxin, causing the cell to detach from its "stomatal development path" and transform into a totipotent stem cell. During the key transition from an "ordinary cell" to a "totipotent stem cell," the cell undergoes profound chromatin remodeling. A large number of silent genes are activated, causing the cell's fate trajectory to bifurcate, thus establishing totipotency. This theoretical resolution provides new ideas for the precise regulation of plant regeneration and crop trait improvement. Currently, experiments using this system in crops like wheat and corn are underway. Zhang Xiansheng stated that in the future, it may be possible to achieve rapid cloning of elite varieties and shorten breeding cycles through precise regulation. Which description of the "molecular switch" activating cell totipotency is accurate()?