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    Optimum time for hand pollination in yam (Dioscorea spp.)

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    Journal Article (2.375Mb)
    Date
    2022
    Author
    Mondo, J.
    Agre, A.P.
    Asiedu, R.
    Akoroda, M.O.
    Asfaw, A.
    Type
    Journal Article
    Review Status
    Peer Review
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Hand pollination success rate is low in yam (Dioscorea spp.), due partly to suboptimal weather conditions. Thus, determining the most suitable time for pollination could improve the pollination success in yam breeding programs. We performed continuous hand pollination within flowering windows of D. rotundata and D. alata for two consecutive years to determine the most appropriate month, week, and hours of the day allowing maximum pollination success. In D. alata crossing block, we observed significant differences among crossing hours for pollination success (p = 0.003); morning hours (8–12 a.m.) being more conducive than afternoons (12–5 p.m.). No significant differences existed between crossing hours in D. rotundata, though the mid-day seemed optimal. For both species, the time interval 11–12 a.m. was more appropriate for crossing while 4–5 p.m. was the poorest. However, in vitro pollen germination tests showed that mid-day pollen collection (12 noon–2 p.m.) had better results than both extremes, though there were strong genotypic effects on outcomes. Pollination success rates differed significantly among months for D. alata (p < 0.001) but not for D. rotundata (p > 0.05). Differences in pollination success existed across weeks within flowering windows of both D. alata (p < 0.001) and D. rotundata (p = 0.004). The seed production efficiency (SPE) had a similar trend as the pollination success rate. No clear pattern existed between the pollination time and the seed setting rate (SSR) or seed viability (SV), though their dynamics varied with weeks and months. This study provided an insight on the dynamics of pollination outcomes under the influence of pollination times and allows detecting months, weeks, and hours of the day when hybridization activities should be focused for better results.
    https://dx.doi.org/10.1371/journal.pone.0269670
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/7732
    IITA Authors ORCID
    Paterne AGREhttps://orcid.org/0000-0003-1231-2530
    Robert Asieduhttps://orcid.org/0000-0001-8943-2376
    Asrat Asfawhttps://orcid.org/0000-0002-4859-0631
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1371/journal.pone.0269670
    Research Themes
    Biotech and Plant Breeding
    IITA Subjects
    Agronomy; Food Security; Plant Breeding; Plant Production; Yam
    Agrovoc Terms
    Yams; Production; Dioscorea; Pollination
    Regions
    Africa; West Africa
    Countries
    Nigeria
    Hubs
    Headquarters and Western Africa Hub
    Journals
    PLoS ONE
    Collections
    • Journal and Journal Articles4835
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