Affiliation:
1. State Key Laboratory for Conservation and Utilization of Bio‐Resources in Yunnan, School of Agriculture Yunnan University Kunming 650500 China
2. Southwest United Graduate School Kunming 650500 China
Abstract
Summary
In potato, stolon swelling is a complex and highly regulated process, and much more work is needed to fully understand the underlying mechanisms.
We identified a novel tuber‐specific basic helix–loop–helix (bHLH) transcription factor, StbHLH93, based on the high‐resolution transcriptome of potato tuber development.
StbHLH93 is predominantly expressed in the subapical and perimedullary region of the stolon and developing tubers. Knockdown of StbHLH93 significantly decreased tuber number and size, resulting from suppression of stolon swelling. Furthermore, we found that StbHLH93 directly binds to the plastid protein import system gene TIC56 promoter, activates its expression, and is involved in proplastid‐to‐amyloplast development during the stolon‐to‐tuber transition. Knockdown of the target TIC56 gene resulted in similarly problematic amyloplast biogenesis and tuberization.
Taken together, StbHLH93 functions in the differentiation of proplastids to regulate stolon swelling. This study highlights the critical role of proplastid‐to‐amyloplast interconversion during potato tuberization.
Funder
China Postdoctoral Science Foundation
National Natural Science Foundation of China
Cited by
1 articles.
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