Role of Non-structural Sugar Metabolism in Regulating Tuber Dormancy in White Yam (Dioscorea rotundata)

Jeremiah S. Nwogha; Wosene G Abtew; Muthurajan Raveendran; Happiness O Oselebe; Jude E Obidiegwu; Cynthia A Chilaka; Amirtham D Domodarasamy

doi:10.20944/preprints202301.0182.v1

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preprints.org > biology and life sciences > plant sciences > doi: 10.20944/preprints202301.0182.v1

Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Role of Non-structural Sugar Metabolism in Regulating Tuber Dormancy in White Yam (Dioscorea rotundata)

Jeremiah S. Nwogha

^* ,

Wosene G Abtew

Muthurajan Raveendran

Happiness O Oselebe

Jude E Obidiegwu

Cynthia A Chilaka

Amirtham D Domodarasamy

Version 1 : Received: 29 December 2022 / Approved: 10 January 2023 / Online: 10 January 2023 (10:24:48 CET)

A peer-reviewed article of this Preprint also exists.

Nwogha, J.S.; Abtew, W.G.; Raveendran, M.; Oselebe, H.O.; Obidiegwu, J.E.; Chilaka, C.A.; Amirtham, D.D. Role of Non-Structural Sugar Metabolism in Regulating Tuber Dormancy in White Yam (Dioscorea rotundata). Agriculture 2023, 13, 343. Nwogha, J.S.; Abtew, W.G.; Raveendran, M.; Oselebe, H.O.; Obidiegwu, J.E.; Chilaka, C.A.; Amirtham, D.D. Role of Non-Structural Sugar Metabolism in Regulating Tuber Dormancy in White Yam (Dioscorea rotundata). Agriculture 2023, 13, 343.

Abstract

Abstract: Changes in sugar composition occur continuously in plants tissues, at different develop-mental stages. Tuber dormancy induction, stability, and breaking are very critical developmental transitions in yam crop production. Prolonged tuber dormancy after physiological maturity has constituted a great challenge in yam genetic improvement and productivity. In the present study, biochemical profiling of non-structural sugar in yam tuber during dormancy was performed to determine the role of non-structural sugar in yam tuber dormancy regulation. Two genotypes of white yam specie; one local genotype (Obiaoturugo) and (TDr1100873) were used for this study. Tubers were sampled at (42, 56, 87, 101, 115, and 143) days after physiological maturity (DAPM). Obiaoturugo exhibited a short dormant phenotype and sprouted at 101DAPM, whereas TDr1100873 exhibited a long-dormant phenotype, and sprouted at 143DAPM. Significant metabolic changes were observed in non-structural sugar parameters, dry matter, and moisture content in Obiaoturugo from 56DAPM, whereas, in TDr1100873 significant metabolic changes were observed from 101DAPM. It was observed that the onset of these metabolic changes occurred at a point when the tubers of both genotypes exhibited dry matter content of 60%, indicating that dry matter content of 60% might be a critical threshold for white yam tuber sprouting. Nonreducing sugars increased by 9-10-fold during sprouting in both genotypes which indicates its key role in tuber dormancy regulation in white yam. This result implies that some key sugar metabolites can be targeted for dormancy manipulation of yam crop.

Keywords

Sugars; metabolism; yam; tuber; genotypes; dormancy; regulation

Subject

Biology and Life Sciences, Plant Sciences

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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