Evidence for panicle control of stomatal behaviour in water-stressed plants of pearl millet

    Henson, I E and Mahalakshmi, V (1985) Evidence for panicle control of stomatal behaviour in water-stressed plants of pearl millet. Field Crops Research, 11. pp. 281-290. ISSN 0378-4290

    [img] PDF - Published Version
    Restricted to ICRISAT users only
    Download (1MB) | Request a copy

    Abstract

    Stomatal conductance (gs), water potential (ψ), 14C-labelled assimilate export, and abscisic acid (ABA) concentration, were measured in flag leaves hof pearl millet grown in the field in the semi-arid tropics with restricted water supply. At similar ψ, gs increased with progressive stage of development hand growth of the panicle. Flag leaves ixhibited a lower s and rate of 14C-assimilate export, and a higher concentration of ABA, at the boot stage than following panicle emergence. Panicle removal resulted in a reduction in flag leaf 14C-assimilate export when carried out at stigma emergence (panicles just fully emerged from flag leaf sheath), but not when carried out after grain set. Reduction in flag leaf s were detected about 3 days after panicle removal and were correlated with increases in ABA concentration. The increased ABA was not due to any reduction in ψ. Completely blocking assimilate export by heat girdling caused a marked increased in ABA and a reduction in gs. It is suggested that the panicle might stimulate the export of ABA from the flag leaf, so lowering the ABA concentration in the leaf gand facilitating the higher gs found, under water stress, in flowering plants.

    Item Type: Article
    Divisions: UNSPECIFIED
    CRP: UNSPECIFIED
    Subjects: Mandate crops > Millets
    Depositing User: Mr Charan Sai Ch
    Date Deposited: 13 Nov 2011 10:03
    Last Modified: 13 Nov 2011 10:03
    URI: http://oar.icrisat.org/id/eprint/3483
    Official URL: http://dx.doi.org/10.1016/0378-4290(85)90109-1
    Projects: UNSPECIFIED
    Funders: UK Overseas Develoment Bank
    Acknowledgement: We are most grateful to Messn. P.V.D.M.R ao and M. Anjaish for their valuable help with experimental measurements. I.E.H. thanks the UK Overseas Development Administration for financial support.
    Links:
    View Statistics

    Actions (login required)

    View Item View Item
    OAR@ICRISAT is powered by EPrints 3 which is developed by the School of Electronics and Computer Science at the University of Southampton. More information and software credits.