The relative contribution of non-foliar organs of cotton to yield and related physiological characteristics under water deficit

Yuan Yuan Hu, Ya Li Zhang, Xiao Ping Yi, Dong Xia Zhan, Hong Hai Luo, Chow Wah Soon, Wang Feng Zhang*

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    15 Citations (Scopus)

    Abstract

    Water deficit is one of the most important causes of decreased yield in cultivated plants. Non-foliar green organs in cotton play an important role in yield formation at the late growth stage. Although better photosynthetic performance was observed in a non-foliar organ (bract) compared with leaves under water deficit. However, the physiological response of each organ in cotton to water deficit has not been comprehensively studied in relation to the water status and photosynthesis characteristics. We studied the maintenance of water status of each organ in cotton by measuring their relative water content, proline content and stomatal characteristics. Water deficit significantly decreased the surface area of each organ, but to a lesser extent in non-foliar organs. Our results showed that the relative contribution of biomass accumulation of non-foliar organs increased under water deficit. Non-foliar organs (bracts and capsule wall) showed less ontogenetic decrease in O2 evolution capacity and in RuBPC activity (per dry weight) as well as better antioxidant systems than leaves at various days after anthesis. We conclude that the photosynthesis from non-foliar organs is important for increasing cotton yield especially under water deficit conditions.

    Original languageEnglish
    Pages (from-to)975-989
    Number of pages15
    JournalJournal of Integrative Agriculture
    Volume13
    Issue number5
    DOIs
    Publication statusPublished - May 2014

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