01799naa a2200253 a 450000100080000000500110000800800410001910000210006024500830008126000090016452011360017365000110130965000250132065300150134565300160136065300250137665300090140165300110141065300220142165300130144370000240145670000170148077300480149716462642023-04-20       1981    bl uuuu     u00u1 u    #d1 aSYVERTSEN, J. P.  aGrowth rate and water relations of citrus leaf flushes.h[electronic resource]  c1981  aGrowth rates of seasonal leaf flushes of 'Valencia' orange [Citrus sinensis (L.) Osbeck] were measured and water relations characteristics of young (new) and over-wintered (old) citrus leaves were compared. New flush leaves had lower specific leaf weights and lower midday leaf water potentials than comparably exposed old leaves. Spring and summer flush new leaves had higher osmotic potentials than old leaves.These differences became non-significant as the new leaves matured. During summer conditions, water-stressed new leaves reached zero turgor and stomatal conductance also began to decrease in them at higher leaf water potentials. Opened flowers and new flush leaves lost more water, on a dry weigh basis, than flower buds, fruit or mature leaves. The results illustrate differences in leaf water potential and stomatal conductance which can be attributed to the maintenance of leaf turgor by decreases in leaf osmotic potentials as leaves mature. These changes in citrus leaf water relations are especially important since water stress resulting from high water losss rates of new tissues reduce flowering and fruit set.  aCitrus  astomatal conductance  aGrapefruit  aGrowth rate  aLeaf water relations  aMacf  aOrange  aOsmotic potencial  aParadisi1 aSMITH JUNIOR, M. L.1 aALLEN, J. C.  tAnnals of Botanygv.47,n.1, p.97-105, 1981.