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Differential sensitivity of turfgrass organs to water stress



Differential sensitivity of turfgrass organs to water stress



Hortscience 21(4): 1014-1015



The relative sensitivity of various organs of Poa pratensis L. 'Merion' (Kentucky bluegrass) to osmotically induced water stress was evaluated. Lateral bud meristems (axillary buds) were most sensitive to increases in osmotic pressure. The decrease in lateral bud development subsequently resulted in a decrease in tiller and rhizome numbers. Relative growth rates of various organs of Kentucky bluegrass further established that shoot dry-matter loss in response to waterstress was due primarily to decreased tiller and rhizome growth. The effect of increasing osmotic pressure had relatively similar and less severe effects on leaf and root growth. The potential use of relative growth responses to water stress is discussed.

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