Record nummer 717946
Titel artikel Photosynthesis and stomatal conductance of potato leaves : effects of leaf age, irradiance, and leaf water potential
Auteur(s) Vos, J. ; Oyarzun, P.J.
Tijdschrifttitel Photosynthesis research : an international journal
Deel(Jaar)Nummer 11(1987)
Paginering 253 - 264
Annotatie(s) 25 refs.; Summary (en)
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Trefwoorden (cab) fotosynthese / plantenontwikkeling / plantenfysiologie / aardappelen / wortels / solanum tuberosum
Rubrieken Gewassen (algemeen)
Publicatie type Artikel
Taal Engels
Toelichting Potatoes (Solanum tuberosum L. cv. Bintje) were grown in naturally lit glasshouse. Laboratory measurements on leaves and three insertion levels showed a decline with leaf age in photosynthetic capacity and in stomatal conductance at near saturating irradiance. Conductance declined somewhat more with age than photosynthesis, resulting in a smaller internal CO2 concentration in older relative to yonger leaves. Leaves with different insertion number behaved similarly. The changes in photosynthesis rate and nitrogen conent with leave age were closely correlated. When PAR exceeded circa 100 W m -2 the rate of photosynthesis and stomatal conductance changed proportionally as indicated by a constant internal co2 concentration. The photosynthesis - irradiance data were fitted to an asymptotic exponential model. The parameters of the model are AMAX. the rate of photosynthetat the infinite irradiance, and EFF, the slope at low light levels. AMAX declined strongly with leaf age as did EFF, but to a smaller extent. During drought stress photosynthetic capacity declined directly with decreasing water potential ( range - o.6 to -1.1 MPa). Initially, stomatal conductance declined faster than photosynthesiscapacity
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