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    Duration from vine emergence to flowering suggests a longday or rate of change of photoperiod response in white yam (Dioscorea rotundata Poir)

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    Date
    2007
    Author
    Ile, E.I.
    Craufurd, Peter Q.
    Asiedu, Robert
    Battey, N.H.
    Type
    Journal Article
    Metadata
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    Abstract/Description
    The objective of this study was to quantify the effect of photoperiod on the duration from vine (shoot) emergence to flowering in white or Guinea yam (Dioscorea rotundata). The duration from vine emergence to flowering in two clonal varieties of yam (TDr 131 and TDr 99-9) was recorded at 10 different sowing dateslocations in Nigeria. Durations to flowering varied from 40 to >88 days. Mean daily temperature and photoperiod between vine emergence and flowering varied from 25 to 27◦ C and 13.1 to 13.4 h day−1 , respectively. Both clones had similar responses to temperature, with base and optimum temperatures of 12 and 25–27◦ C, respectively. Thermal durations to flowering were strongly related (r2> 0.75–0.83) to absolute photoperiod (h) at vine emergence as well as to rate of change of photoperiod (s day−1) at vine emergence. The response to absolute photoperiod suggests that white yams are quantitative LDPs, flowering sooner in long than short days. Yams also flowered earlier when the rate of change of photoperiod was positive but small, or was negative. It is suggested that yams may use a combination of photoperiod and rate of change in order to fine tune flowering time.
    https://doi.org/10.1016/j.envexpbot.2006.06.009
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/3490
    Digital Object Identifier (DOI)
    https://doi.org/10.1016/j.envexpbot.2006.06.009
    IITA Subjects
    Yam; Plant Genetic Resources; Food Security; Plant Diseases; Disease Control; Food Security; Plant Production; Pests Of Plants; Plant Breeding; Livelihoods; Handling, Transport, Storage And Protection Of Agricultural Products; Impact Assessment; Farming Systems
    Agrovoc Terms
    Dioscorea Rotundata; Flowering; Photoperiod; Rate Of Change Of Photoperiod; Yams; Clones; Vine Emergence
    Regions
    Acp; Africa; Europe; West Africa
    Countries
    United Kingdom; Nigeria
    Collections
    • Journal and Journal Articles4836
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