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

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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.
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