eprintid: 11556
rev_number: 12
eprint_status: archive
userid: 3170
dir: disk0/00/01/15/56
datestamp: 2020-08-14 11:41:48
lastmod: 2020-08-14 11:41:48
status_changed: 2020-08-14 11:41:48
type: article
metadata_visibility: show
creators_name: Low, J W
creators_name: Ortiz, R
creators_name: Vandamme, E
creators_name: Andrade, M
creators_name: Biazin, B
creators_name: Grüneberg, W J
icrisatcreators_name: Birhanu, B
affiliation: International Potato Center (CIP), Sub-Saharan Africa Regional Office, Nairobi
affiliation: Department of Plant Breeding, Swedish University of Agricultural Sciences, Alnarp, Sweden
affiliation: International Potato Center (CIP), Kigali, Rwanda,
affiliation: International Potato Center (CIP), Maputo, Mozambique
affiliation: ICRISAT (Addis Ababa)
affiliation: International Potato Center (CIP), Headquarters, Lima, Peru
country: Kenya
country: Sweden
country: Rwanda
country: Mozambique
country: Ethiopia
country: Peru
title: Nutrient-Dense Orange-Fleshed Sweetpotato: Advances in Drought-Tolerance Breeding and Understanding of Management Practices for Sustainable Next-Generation Cropping Systems in Sub-Saharan Africa
ispublished: pub
subjects: DT1
subjects: PLB1
subjects: n345
divisions: CRPS5
crps: crp1.9
full_text_status: public
keywords: Orange-fleshed sweetpotato, Breeding, Drought tolerance, Heterosis, Intensification, Cropping system
note: Time of all authors from the International Potato Center was
covered by the Sweetpotato Action for Security and Health in
Africa project, funded by the Bill & Melinda Gates Foundation
[OPP1019987]. This research undertaken is also part of, and
benefited from funding by, the CGIAR Research Program on
Roots, Tubers and Bananas and supported by CGIAR Trust Fund
contributors (https://www.cgiar.org/research/).
abstract: Almost half of children < 5 years old living in sub-Saharan Africa (SSA) suffer from vitamin A deficiency and 60% suffer from iron deficiency. Thus, there has been a strong
commitment to breeding for, promoting awareness of, and delivering adapted pro-vitamin A rich orange-fleshed sweetpotato (OFSP) in SSA during the past two decades and
for enhanced iron content since 2014. This review article focuses on major breeding efforts in SSA to enhance the drought tolerance of OFSP and reviews integrated crop
management practices for improved and sustained sweetpotato production in SSA farming systems. Under climate change, the frequency and severity of droughts is expected to increase. Technical issues are presented in the context of addressing challenges along the entire value chain to ensure adoption. First, the use of an accelerated breeding scheme reduced the breeding cycle from 8–10 to 4–5 years.
Since 2010, 19 drought-tolerant OFSP cultivars have been released in Mozambique, 7 in Malawi, and 2 in South Africa. Moreover, research in four breeding populations
using the heterosis exploiting breeding scheme (HEBS) demonstrated that within one breeding cycle of 5 years, clones with significantly higher root yield, abiotic tolerance, host plant resistance to pests and diseases, and early maturity can be produced. In the future, HEBS will be combined with greater use of modern genomic tools,
new phenotyping tools, and CRISPR/Cas9-mediated gene editing. Second, beyond genetic enhancements, evidence is presented that using improved crop management
systems, existing sweet potato yields can be increased 2–4 times. Current knowledge is reviewed concerning sweetpotato’s role in diverse farming systems, but integrated crop management is clearly under researched. Third, the outlook for drought tolerance breeding indicates that two distinct classes of nutrient-rich cultivars are emerging: (1) Early maturing cultivars (< 4 month growing period) that escape drought but also serve humid environments with small landholding size per capita; and (2) Medium maturing (4–6 month growing period) cultivars that avoid drought, are drought tolerant and exhibit
continuous root formation. Increasing commercialization of the crop and climate change will drive demand, and the willingness of farmers to invest in improved sweetpotato
crop management.
date: 2020-05
date_type: published
publication: Frontiers in Sustainable Food Systems
volume: 4
publisher: Frontiers Media
pagerange: 1-22
id_number: doi:10.3389/fsufs.2020.00050
refereed: TRUE
issn: 2571-581X
official_url: https://doi.org/10.3389/fsufs.2020.00050
related_url_url: https://scholar.google.com/scholar?hl=en&as_sdt=0%2C5&q=10.1007%2Fs10457-020-00493-7&btnG=
related_url_type: pub
citation:   Low, J W and Ortiz, R and Vandamme, E and Andrade, M and Biazin, B and Grüneberg, W J  (2020) Nutrient-Dense Orange-Fleshed Sweetpotato: Advances in Drought-Tolerance Breeding and Understanding of Management Practices for Sustainable Next-Generation Cropping Systems in Sub-Saharan Africa.  Frontiers in Sustainable Food Systems, 4.  pp. 1-22.  ISSN 2571-581X     
document_url: http://oar.icrisat.org/11556/1/low_jw_et_al_200513.pdf