The effect of flowering on stomatal response to water stress in pearl millet (Pennisetum americanum [L.] Leeke)

Henson, I E and Mahalakshmi, V and Alagarswamy, G and Bidinger, F R (1984) The effect of flowering on stomatal response to water stress in pearl millet (Pennisetum americanum [L.] Leeke). Journal of Experimental Botany, 35 (151). pp. 219-226. ISSN 0022-0957

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Abstract

Stomata on the upper leaves of drought-stressed pearl millet were more open in flowering (FL) than in pre-flowering (PF) plants. This was not due to differences in leaf water potential (LWP); stomata of PF plants closed when LWP fell to c.-1.7 MPa, while in FL plants stomata closed when LWP approached -2.3 MPa. Osmotic adjustments did not account for the differences as relations between turgor potential (TP) and LWP were similar in FL and PF plants. While stomata of PF plants closed as TP became zero, FL plants' stomata remained open even after bulk leaf turgor was lost. Leaves of water-stressed PF plants contained higher levels of ABA than leaves of FL plants' despite similarities in water status. From these results and from relationships between leaf conductance and stage of panicle development it was concluded that the tendency of stomata to remain open despite water stress and loss of bulk leaf TP is related to the presence of an emerged panicle

Item Type:	Article
Divisions:	UNSPECIFIED
CRP:	UNSPECIFIED
Uncontrolled Keywords:	Pennisetum americanum [L.] Leeke, Pearl millet, Flowering, Stomata, Water stress, Abscisic acid
Subjects:	Mandate crops > Millets
Depositing User:	Ms K Syamalamba
Date Deposited:	24 Nov 2011 10:43
Last Modified:	24 Nov 2011 10:43
URI:	http://oar.icrisat.org/id/eprint/4304
Official URL:	http://dx.doi.org/10.1093/jxb/35.2.219
Projects:	UNSPECIFIED
Funders:	U.K. Overseas Development Administration
Acknowledgement:	We are most grateful to Mr. P.V.D.M. Rao, Mr. G.D.P. Rao and Mr. M.H. Jeffrey for their help with the experimental work. I.E.H. thanks the U.K. Overseas Development Administration for financial support
Links:	Author

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