Characters related to higher starch accumulation in cassava storage roots

Scientific Reports
You-Zhi LiBaoshan Chen

Abstract

Cassava (Manihot esculenta) is valued mainly for high content starch in its roots. Our understanding of mechanisms promoting high starch accumulation in the roots is, however, still very limited. Two field-grown cassava cultivars, Huanan 124(H124) with low root starch and Fuxuan 01(F01) with high root starch, were characterised comparatively at four main growth stages. Changes in key sugars in the leaves, stems and roots seemed not to be strongly associated with the final amount of starch accumulated in the roots. However, when compared with H124, F01 exhibited a more compact arrangement of xylem vascular bundles in the leaf axils, much less callose around the phloem sieve plates in the stems, higher starch synthesis-related enzymatic activity but lower amylase activity in the roots, more significantly up-regulated expression of related genes, and a much higher stem flow rate (SFR). In conclusion, higher starch accumulation in the roots results from the concurrent effects of powerful stem transport capacity highlighted by higher SFR, high starch synthesis but low starch degradation in the roots, and high expression of sugar transporter genes in the stems. A model of high starch accumulation in cassava roots was therefore propos...Continue Reading

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Citations

May 13, 2017·International Journal of Molecular Sciences·Meng-Ting GengJian-Chun Guo
Mar 27, 2020·International Journal of Molecular Sciences·Aya Kitajima-KogaToshiaki Mitsui
Mar 27, 2018·3 Biotech·Noha S Khalifa, Mohammed N Hasaneen
Mar 30, 2021·Plant Science : an International Journal of Experimental Plant Biology·Kirtikumar R KondhareAshok P Giri
Dec 18, 2018·Journal of Agricultural and Food Chemistry·Margit DrapalPaul D Fraser

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Methods Mentioned

BETA
transgenic
PCR

Software Mentioned

SPSS17

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