OAR@ICRISATA Rapid Effect of Heat Girdling on Stomatal Conductance in Pearl Millet (Pennisetum americanum [L.] Leeke)I EHensonauthorVMahalakshmiauthorA heat girdle, applied to the base of flag leaves of pearl millet, caused a rapid decline in stomatal conductance (gs). Stomata began to close within minutes of girdling (with gs reaching a minimum after about 5 min) but then partly reopened before closing again 20\2-30 min from the start of treatment. The initial closing response could be deferred and initially counteracted by enclosing the leaf in a polyethylene bag. Cell death in the girdled zone appeared to be necessary for the response as mechanical pressure alone was ineffective. Only stomata «downstream» of a girdled zone (relative to the direction of xylem flow) were affected by the treatment; there was no lateral or 《backward》 transmission of a closing stimulus. No immediate differences between control and girdled leaves could be detected in bulk leaf water potential or in abscisic acid content. The rapid effects of girdling on gs are thus ascribed to a transient, localised disturbance in epidermal water relations probably induced by a temporary interruption in xylem flow.Pearl Millet1985ElsevierArticle

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