Physiological and Biochemical Basis and Molecular Mechanism of Solanum tuberosum Tuberization

doi:10.13560/j.cnki.biotech.bull.1985.2021-0065

Abstract

Abstract:

Tuber induction and formation of potato（Solanum tuberosum L.）is the most pivotal event in their growth,development and determination of yield,which involves the interaction of multiple environmental factors with plant hormones and signal molecules,as well as the regulations of this interaction on large number of key genes and multiple signal transduction and metabolic pathways. This paper overviewed the physiological and biochemical basis of potato tuberization,including the process of tuberization and the endogenous factors and environmental conditions affecting the tuberization. Also the paper discussed the signal transduction pathways and regulatory roles of related genes,proteins,miRNAs,hormones and second messenger molecules in tuberization. Further a possible network of molecular interaction during tuberization was constructed;and finally directions and potential hotspots for future research were prospected,aiming to provide reference and new ideas for breeding potato varieties with high yield and good quality by precise molecular breeding in future.

Key words: Solanum tuberosum, tuberization, induction, signal transduction, molecular mechanism

LEI Chun-xia, LI Can-hui, CHEN Yong-kun, GONG Ming. Physiological and Biochemical Basis and Molecular Mechanism of Solanum tuberosum Tuberization[J]. Biotechnology Bulletin, 2022, 38(4): 44-57.

Figures/Tables 2

Fig. 1 Illustration of S. tuberosum tuberization in vitro A：Stolon formation and growth. B：Bending of the stolon apex and swelling of the subapical part. C：The growing tuber. D：Tuberization. Potato aseptic plantlets cultured in vitro were used as experimental material,single stem segments of the pre-cultured aseptic plantlets were put in a culture flask（1/2 MS + 5.5% sucrose + 0.7% agar medium）,and cultured in the total darkness（TD）in a plant growth chamber at 20℃ for 15 d. The top part of about 1cm was photographed,which included 4 typical morphological changing stages of tuberization

Fig. 2 Schematic diagram showing the possible molecular interaction network during tuber induction and formation in potato

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