eprintid: 3483
rev_number: 8
eprint_status: archive
userid: 65
dir: disk0/00/00/34/83
datestamp: 2011-11-13 10:03:42
lastmod: 2011-11-13 10:03:42
status_changed: 2011-11-13 10:03:42
type: article
metadata_visibility: show
contact_email: Library-ICRISAT@cgiar.org
item_issues_count: 0
creators_name: Henson, I E
creators_name: Mahalakshmi, V
icrisatcreators_name: Mahalakshmi, V
affiliation: Plant Breeding Institute(Cambridge)
affiliation: ICRISAT(Patancheru)
country: India
title: Evidence for panicle control of stomatal behaviour in water-stressed plants of pearl millet
ispublished: pub
subjects: S1.5
full_text_status: restricted
note: 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.
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.
date: 1985
date_type: published
publication: Field Crops Research
volume: 11
publisher: Elsevier
pagerange: 281-290
refereed: TRUE
issn: 0378-4290
official_url: http://dx.doi.org/10.1016/0378-4290(85)90109-1
related_url_url: http://scholar.google.co.in/scholar?hl=en&q=allintitle%3A+Evidence+for+panicle+control+of+stomatal+baheviour+in+water-stressed+plants+of+pearl+millet&btnG=Search&as_sdt=0%2C5&as_ylo=&as_vis=1
related_url_type: author
funders: UK Overseas Develoment Bank
citation:   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     
document_url: http://oar.icrisat.org/3483/1/JA_447.pdf