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    Effect of leaf thinning on shoot growth and tuber yield of white Guinea yam

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    Journal Article (4.972Mb)
    Date
    2021
    Author
    Iseki, K.
    Olaleye, O.
    Matsumoto, R.
    Type
    Journal Article
    Review Status
    Peer Review
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Mutual leaf shading can inhibit the growth of yam, reducing tuber yield. To improve light utilization, approximately 25% of leaves in a plant were thinned during the period of maximum shoot growth. Shoot dry weight was estimated every two weeks using a non-destructive method. Leaf thinning caused higher shoot growth rates (SGRs) after thinning, while control plants had SGRs close to zero. The higher SGRs in the thinned plants was attributed to an increase in new leaf development. This indicates that the plateau in shoot growth commonly observed during the late growth period is reversible and could be improved artificially. In thinned plants, there was a positive relationship between shoot dry weight and SGR, although no such relationship was observed in control plants after the middle growth period. This positive correlation indicates a higher shoot growth per unit leaf area in the thinned plants than in the control plants, presumably due to improved light utilization and a higher photosynthetic rate of new leaves. However, leaf thinning reduced tuber yields, presumably because of a lower total carbon assimilation per plant and greater growth competition between shoots and tubers. High correlations between shoot dry weight and tuber yield indicated that a high shoot biomass is more important than improving light utilization for increased tuber yields.
    Acknowledgements
    We thank Mr. Oyedele Sunday O., Oketokun Abass, and Ms. Obaude Oyebola O. for assisting in field evaluations.
    https://dx.doi.org/10.1080/1343943x.2021.1943466
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/7281
    IITA Authors ORCID
    Ryo Matsumotohttps://orcid.org/0000-0002-0106-6728
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1080/1343943x.2021.1943466
    Research Themes
    Biotech and Plant Breeding
    IITA Subjects
    Agronomy; Plant Breeding; Plant Production; Yam
    Agrovoc Terms
    Yams; Dioscorea Rotundata; Shading; Shoots; Tubers; Yields; Thinning
    Regions
    Africa; West Africa
    Countries
    Nigeria
    Hubs
    Headquarters and Western Africa Hub
    Journals
    Plant Production Science
    Collections
    • Journal and Journal Articles4469
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