Journal
TREE PHYSIOLOGY
Volume 23, Issue 8, Pages 553-559Publisher
HERON PUBLISHING
DOI: 10.1093/treephys/23.8.553
Keywords
chlorophyll a : b ratio; Citrus reticulata Blanco; grana; photosynthesis; plastoglobuli; starch; thylakoid
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One-year-old 'Cleopatra mandarin' (Citrus reticulata Blanco) seedlings were raised in a greenhouse and fertilized with nitrogen (N) at four application frequencies. Nitrogen-deficient leaves (86 mmol N m(-2)) had less chlorophyll per unit area, but a greater chlorophyll a:b ratio than N-fertilized leaves (> 187 mmol N m(-2)). Leaf dry mass per area (DM area(-1)) and total chlorophyll concentration increased linearly with increasing leaf N, whereas chlorophyll a:b ratio declined. Net assimilation of CO2 (A(CO2)) and leaf water-use efficiency (WUE) reached maximum values in leaves with similar to187 mmol N m(-2). Nitrogen-deficient leaves exhibited small chloroplasts with no starch granules; grana and stroma lamellae that coincided with the accretion of numerous large plastoglobuli in the stroma disintegrated. High-N leaves had large chloroplasts with well-developed grana, stroma lamellae and starch granules that enlarged with increasing N concentration. The lack of an increase in A(CO2) capacity at leaf N concentrations above 187 mmol N m(-2) appeared to be correlated with the presence of numerous large starch granules.
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