Seasonal changes in photosynthesis, nitrogen content and nitrogen partitioning in Lindera umbellata leaves grown in high or low irradiance

Yuko Yasumura, Kouki Hikosaka, Tadaki Hirose

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)

Abstract

Seasonal changes in photosynthetic capacity, leaf nitrogen (N) content and N partitioning were studied from before leaf maturation (spring) until death (autumn) in high- and low-light-exposed leaves of a deciduous shrub, Lindera umbellata var. membranacea (Maxim.) Momiyama growing in a natural forest in northeast Japan. In spring, light-saturated photosynthetic rate (P max) was low despite high leaf N and Rubisco contents, indicating that the photosynthetic apparatus was not yet functionally developed. Rubisco seemed to be only partially active. In summer and autumn, Pmax per unit leaf N increased and changes in Pmax were correlated with changes in leaf N and two photosynthetic components, Rubisco and chlorophyll. Changes in these components paralleled the changes in leaf N. During leaf senescence, about 70% of leaf N was resorbed. Metabolic proteins that accounted for the majority of leaf N in summer were highly degradable and more than sufficient to explain the high N-resorption efficiency. Structural proteins represented only a small part of leaf N and were relatively resistant to degradation and thus contributed little to N resorption. Leaf N partitioning between metabolic and structural proteins determined the amount of retranslocatable N, but did not strictly determine the N content of a dead leaf or N-resorption efficiency.

Original languageEnglish
Pages (from-to)1315-1323
Number of pages9
JournalTree Physiology
Volume26
Issue number10
DOIs
Publication statusPublished - 2006 Oct

Keywords

  • Chlorophyll
  • Dead leaf
  • Leaf mass per area
  • Leaf senescence
  • Metabolic protein
  • Nitrogen resorption
  • Rubisco
  • Structural protein

ASJC Scopus subject areas

  • Physiology
  • Plant Science

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