Loss of stomatal function in ageing hybrid poplar leaves

Reich, P.B.

Annals of Botany 53(5): 691-698


ISSN/ISBN: 0305-7364
DOI: 10.1093/oxfordjournals.aob.a086734
Accession: 001630264

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Leaves of NE cv. 41 (P. maximowiczii X P. trichocarpa), NE cv. 207 (P. deltoides X P. trichocarpa) and NE cv. 308 (P. maximowiczii X P. incrassata), 12, 24, 36 or 48 days old, were kept in growth chambers at day/night temp. of 25/20 degrees C. A steady state porometer was used to measure leaf diffusive conductance to water vapour for both adaxial and abaxial surfaces during changes in illumination. The conductance of older leaves oscillated more frequently and the oscillations were more random than in younger leaves. The diffusive conductance of older leaves changed less following sudden shifts from light to dark or vice versa, and temporal patterns of diffusive conductance in older leaves appear to be more independent of microenvironment conditions. The conductance of older leaves was higher in the dark and following excision, and lower in the light than that of younger leaves. The total range of response and stability of conductance were lower in older leaves.