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Antimicrobial peptides (AMPs) are promising next-generation antibiotics, but are difficult to produce due to the toxicity to bacterial hosts. Here, the authors report the utilization of transplastomic tobacco plants for AMPs production without cytotoxic effects via inducible expression systems and fusions to cleavable carrier protein.

Spatial control of auxin signaling maintains a balance between stem-cell self-renewal and differentiation at the plant shoot apex. Here Ma et al. show that rheostatic control of auxin response by the WUSCHEL transcription factor maintains stem cells by conferring resistance to auxin mediated differentiation.