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Stomatal Response to Water Stress and its Relationship to Bulk Leaf Water Status and Osmotic Adjustment in Pearl Millet (Pennisetum americanum [L.] Leeke)

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Relation http://oar.icrisat.org/3376/
http://dx.doi.org/10.1093/jxb/34.4.442
 
Title Stomatal Response to Water Stress and its Relationship to Bulk Leaf Water Status and Osmotic Adjustment in Pearl Millet (Pennisetum americanum [L.] Leeke)
 
Creator Henson, I E
Alagarswamy, G
Mahalakshmi, V
Bidinger, F R
 
Subject Millets
 
Description The water potential (Ψ) at which stomata completed closure (Ψ8Lmin) was determined for pearl millet (Pennisetum americanum [L.] Leeke) at two growth stages by monitoring changes in leaf conductance (gL) and Ψ following shoot detachment. Leaf water status was evaluated concurrently using a pressure-volume (P-V) technique.

In a pot experiment with young vegetative plants, Ψ8Lmin closely approximated to the estimated Ψ at zero turgor (Ψu) both for control and for drought-conditioned plants which had osmotically adjusted. However, for penultimate leaves of field-grown flowering plants, Ψ8Lmin was found to be 0.61 (irrigated plants) and 0.87 (droughted plants) MPa below Ψu. In drought-stressed field-grown plants, osmotic adjustment (characterized by a decrease in solute (osmotic) potential (Ψs ) at both full hydration and zero turgor) was insufficient to maintain a positive bulk leaf turgor potential (Ψp) once Ψ had declined to below about -1.5 MPa. It is suggested that localized adjustment by the stomatal complex in response to environmental differences, leaf ageing and/or ontogenetic change, is responsible for the uncoupling of stomatal from bulk leaf water status.
 
Publisher Oxford University Press
 
Date 1982
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/3376/1/JA_262.pdf
Henson, I E and Alagarswamy, G and Mahalakshmi, V and Bidinger, F R (1982) Stomatal Response to Water Stress and its Relationship to Bulk Leaf Water Status and Osmotic Adjustment in Pearl Millet (Pennisetum americanum [L.] Leeke). Journal of Experimental Botany, 34 (4). pp. 442-450. ISSN 0022-0957