Photosynthetic characteristics of the leaves of ‘Golden Delicious’ appletrees

• R. L. WATSON

• J. J. LANDSBERG

• M. R. THORPE

抄録

Abstract Using an open‐system leaf chamber, gas exchange measurements on attached leaves of 3‐4‐year‐old Golden Delicious apple trees, made through two seasons, provided data from which the parameters of a leaf photosynthesis model could be derived. The equation is: <jats:graphic xmlns:xlink="http://www.w3.org/1999/xlink" position="anchor" xlink:href="urn:x-wiley:01407791:media:PCE51:PCE_51_mu1"> image where C 1 is internal CO 2 concentration and Q p is the incident quantum flux. There was considerable leaf to leaf variation in the values of the parameters but no clear seasonal trends were established. The initial slope (a) had an average value of about 2.5 × 10 −3 mg μmol −1 † (i.e. quantum yield ∼ 0.057); the mesophyll conductance (g m ) was about 3.5 mm s −1 in extension leaves of trees carrying fruit and 2.5 mm s −1 in extension leaves of defruited trees. Differences between the values of g m for spur leaves with and without subtending fruits were not significant; 2.5 mm s −1 may be used. Dark respiration (R d , mg m −2 s −1 ) increased exponentially with temperature (T°C); R d ∼ 0.006 exp (0.09 T). At saturating photon flux density P n was linearly related to C i , up to C i ∼ 250 mg m −3 . Optimum temperatures for P n were slightly different in the two years and were in the range 16‐26°C.

収録刊行物

• Plant, Cell & Environment

  Plant, Cell & Environment 1 (1), 51-58, 1978-03

  Wiley

キーワード

• Plant Science
• Physiology

詳細情報

• CRID: 1362825893969352320
• NII論文ID: 30014950151
• DOI: 10.1111/j.1365-3040.1978.tb00746.x
• ISSN: 13653040
• ISSN: 01407791
• ISSN: http://id.crossref.org/issn/01407791
• Web Site: https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-3040.1978.tb00746.x
• Web Site: https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-3040.1978.tb00746.x
• データソース種別:
  • Crossref
  • CiNii Articles