Field transcriptome analysis reveals a molecular mechanism for cassava-flowering in a mountainous environment in Southea
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Field transcriptome analysis reveals a molecular mechanism for cassava‑flowering in a mountainous environment in Southeast Asia Hiroki Tokunaga1,2 · Do Thi Nhu Quynh2,3 · Nguyen Hai Anh2,3 · Pham Thi Nhan4 · Akihiro Matsui1 · Satoshi Takahashi1 · Maho Tanaka1 · Ngo Minh Anh2,5 · Nguyen Van Dong2,3 · Le Huy Ham2,3 · Asuka Higo6 · Truong Minh Hoa4 · Manabu Ishitani2,7 · Nguyen Ba Nhat Minh4 · Nguyen Huu Hy4 · Pao Srean8 · Vu Anh Thu1,2,3 · Nguyen Ba Tung4 · Nguyen Anh Vu2,3 · Kaho Yamaguchi6 · Hiroyuki Tsuji6 · Yoshinori Utsumi1,2 · Motoaki Seki1,2,6,9 Received: 2 December 2019 / Accepted: 17 August 2020 © Springer Nature B.V. 2020
Key message The field survey in this article showed in ‘KU50’, a popular variety and late-branching type of cassava in Southeast Asia, that flowering rarely occurs in normal-field conditions in Southeast Asia but is strongly induced in the dry season in the mountainous region. Flowering time is correlated with the expression patterns of MeFT1 and homologs of Arabidopsis GI, PHYA, and NF-Ys. Abstract Cassava (Manihot esculenta Crantz) is a tropical crop that is propagated vegetatively rather than sexually by seed. Flowering rarely occurs in the erect-type variety grown in Southeast Asia, but it is known that cassava produces flowers every year in mountainous regions. Data pertaining to the effect of environmental factors on flowering time and gene expression in cassava, however, is limited. The aim of the present study was to determine the kinds of environmental conditions that regulate flowering time in cassava and the underlying molecular mechanisms. The flowering status of KU50, a popular variety in Southeast Asia and late-branching type of cassava, was monitored in six fields in Vietnam and Cambodia. At non-flowering and flowering field locations in North Vietnam, the two FLOWERING LOCUS T (FT)-like genes, MeFT1 and MeFT2, were characterized by qPCR, and the pattern of expression of flowering-related genes and genes responsive to environmental signals were analyzed by using RNA sequencing data from time-series samples. Results indicate that cassava flowering was induced in the dry season in the mountain region, and that flowering time was correlated with the expression of MeFT1, and homologs of Arabidopsis GI, PHYA, and NF-Ys. Based upon these data, we hypothesize that floral induction in cassava is triggered by some conditions present in the mountain regions during the dry season. Keywords Cassava · Field transcriptome · Flowering · Manihot esculenta · MeFT1
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11103-020-01057-0) contains supplementary material, which is available to authorized users. * Hiroki Tokunaga [email protected]
4
Hung Loc Agricultural Research Center (HLARC), Dong Nai, Vietnam
* Motoaki Seki [email protected]
5
JICA Vietnam Office, Hanoi, Vietnam
6
Kihara Institute for Biological Research, Yokohama City University, Kanagawa, Japan
1
Center for Sustainable Resource Science, RIK
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