Environmental analysis of aerial O2 transport through leaves for root respiration in relation to water uptake in cucumber plants (Cucumis sativus L.) in O2-deficient nutrient solution

S. Yoshida, H. Eguchi

    Research output: Contribution to journalArticlepeer-review

    16 Citations (Scopus)

    Abstract

    Aerial O2 transport through leaves for root respiration was examined in relation to water uptake in cucumber plants (Cucumis sativus L.) by using an airtight hydroponic system and by 18O2 tracing. Root respiration clearly responded to aerial O2 to which, in darkness, the leaves were exposed. Root respiration in an O2-deficient nutrient solution increased with a higher aerial O2 concentration and decreased with a lower aerial O2 concentration. Water uptake was promoted in darkness with aerial O2, and appeared simultaneous in dynamics with root respiration. For tracing aerial O2 transport through leaves for root respiration, leaves were exposed to aerial 18O2, and H2 18O produced by respiration in roots was analysed. A significant differ ence In 18O2 isotopic abundance in roots was noted between 18 and untreated plants at the 1% level. On the other hand, no aerenchyma was present in the cortex of cucumber roots. From these facts, we conclude that aerial O2 can be transported through leaves and gas-filled intercellular spaces among cells for root respiration in cucumber plants grown in an O2 root environment, and this results in improvement of water uptake in darkness.

    Original languageEnglish
    Pages (from-to)187-192
    Number of pages6
    JournalJournal of Experimental Botany
    Volume45
    Issue number2
    DOIs
    Publication statusPublished - Feb 1 1994

    All Science Journal Classification (ASJC) codes

    • Physiology
    • Plant Science

    Fingerprint

    Dive into the research topics of 'Environmental analysis of aerial O<sub>2</sub> transport through leaves for root respiration in relation to water uptake in cucumber plants (Cucumis sativus L.) in O<sub>2</sub>-deficient nutrient solution'. Together they form a unique fingerprint.

    Cite this