Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Genetic Variation and Heritability for Hydrogen Cyanide in Fresh Cassava Roots

Michael Kanaabi
* ORCID logo ,
Mukasa B. Settumba
,
Ephraim Nuwamanya
,
Nicholas Muhumuza
,
Paula Iragaba
,
Alfred Ozimati
ORCID logo ,
Fatumah B. Namakula
,
Ismail S. Kayondo
,
Julius K. Baguma
,
AnnRitah Nanyonjo
,
Williams Esuma
,
Robert S. Kawuki
Version 1 : Received: 15 January 2024 / Approved: 16 January 2024 / Online: 16 January 2024 (09:58:47 CET)

How to cite: Kanaabi, M.; Settumba, M.B.; Nuwamanya, E.; Muhumuza, N.; Iragaba, P.; Ozimati, A.; Namakula, F.B.; Kayondo, I.S.; Baguma, J.K.; Nanyonjo, A.; Esuma, W.; Kawuki, R.S. Genetic Variation and Heritability for Hydrogen Cyanide in Fresh Cassava Roots. Preprints 2024, 2024011151. https://doi.org/10.20944/preprints202401.1151.v1 Kanaabi, M.; Settumba, M.B.; Nuwamanya, E.; Muhumuza, N.; Iragaba, P.; Ozimati, A.; Namakula, F.B.; Kayondo, I.S.; Baguma, J.K.; Nanyonjo, A.; Esuma, W.; Kawuki, R.S. Genetic Variation and Heritability for Hydrogen Cyanide in Fresh Cassava Roots. Preprints 2024, 2024011151. https://doi.org/10.20944/preprints202401.1151.v1

Abstract

Breeding for low hydrogen cyanide (HCN) varieties is a major objective of programmes targeting boiled cassava food product. To enhance breeding for low HCN, knowledge on genetic variation and trait heritability is essential. In this study, 64 cassava clones established across four locations and evaluated for HCN using three HCN assessment methods; 1 to 9 scale, 0 ppm to 800 ppm scale and a quantitative assay based on spectrophotometer readings (HCN_Spec). Data were also collected on the weather variables precipitation, relative humidity, and temperature. Significant differences were observed among clones (P < 0.001) and locations (p < 0.001). There were also significant (p < 0. 001) clone by environment interactions. Locations Arua and Serere posted higher HCN scores among clones and were associated with significantly higher (p < 0.001) mean daily temperature (K) and lower relative humidity (%) across 12-hour and 18-hour intervals. Within locations HCN broad sense heritability estimates ranged 0.22 – 0.64 while combined location heritability estimates ranged 0.14 to 0.32. Relationships between the methods were positive and strong (R2 = 0.75 – 0.92). It is expected that the information herein will accelerate efforts towards breeding for low HCN cassava varieties.

Keywords

Breeding efficiency; End user preference; Phenotyping; Selection; Genotype by environment interaction

Subject

Biology and Life Sciences, Agricultural Science and Agronomy

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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