Photosynthetic Responses to High Temperature and Strong Light Suggest Potential Post-flowering Drought Tolerance of Sorghum Japanese Landrace Takakibi

Norikazu Ohnishi, Fiona Wacera W, Wataru Sakamoto

    Research output: Contribution to journalArticlepeer-review

    5 Citations (Scopus)

    Abstract

    Sorghum [Sorghum bicolor (L.) Moench] is a C4 crop known to be adaptable to harsh environments such as those under high temperature and water deficit. In this study, we focused on a Japanese sorghum landrace Takakibi (NOG) and employed chlorophyll fluorescence measurements to assess its response to environmental stress. Comparison of photosynthetic rate evaluated using two parameters (effective quantum yield and electron transfer rate) indicated that NOG showed less activity than BTx623 in the pre-flowering stage, which was consistent with the higher susceptibility of NOG seedlings to drought than BTx623. The observed differences in photosynthetic activity between the two cultivars were detectable without drought conditions on days with high temperature and strong light. Interestingly, the photosynthetic activity of NOG leaves in stress conditions increased soon after heading, and the trend was similar to that in BTx642, a well-characterized post-flowering drought-tolerant cultivar. In contrast, BTx623 showed a gradual decline in photosynthetic rate. Thus, we inferred that Japanese Takakibi has the potential to show pre-flowering drought susceptibility and post-flowering drought tolerance, through which it adapts to local climates with high temperature and strong light at harvest.

    Original languageEnglish
    Pages (from-to)2086-2099
    Number of pages14
    JournalPlant and Cell Physiology
    Volume60
    Issue number9
    DOIs
    Publication statusPublished - Sep 1 2019

    Keywords

    • Chlorophyll fluorescence
    • Drought tolerance
    • High-temperature stress
    • Photosynthesis
    • Sorghum
    • Strong light

    ASJC Scopus subject areas

    • Physiology
    • Plant Science
    • Cell Biology

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