Summary
During maturation and senescence of leaves of navel orange (Citrus sinensis L.), total lipids per gram of leaf steadily decline. The decline is attributable to the galactolipid and phospholipid partners, while chlorophylls, carotonoids and tocopherols increase during maturation. The phospholipid/galactolipid ratio declines steadily during maturation and senescence but the monogalactosyldiglyceride/digalactosyldiglyceride ratio remains relatively constant. The phospholipid composition remains relatively constant even though the total phospolipid declines markedly.
Ultrastructural changes concomittant with changes in lipid composition include the development of an extensive internal membrane system (grana-fretwork system), and several large-plastoglobuli in the chloroplasts of mature green leaves. With the conversions of chloroplasts to chromoplasts in the senescing leave the internal membrane system is reduced and numerous, large plastoglobuli appear.
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Abbreviations
- carot:
-
carotenoid
- chl:
-
chlorophyll
- DGB:
-
digalactosyl-diglyceride
- GL:
-
glycolipid
- MGDG:
-
monogalactosyl diglyceride
- PC:
-
phosphatidylcholine
- PE:
-
phosphatidylethanolamine
- PG:
-
phosphatidylglycerol
- PI:
-
phosphatidylinositol
- PL:
-
phospholipid
- PS:
-
phosphatidylserine
- quin:
-
quinones
- B:
-
microbody
- C:
-
chloroplasts
- G:
-
granum
- M:
-
mitochondria
- N:
-
nucleus
- O:
-
plastoglobuli
- S:
-
starch
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Freeman, B.A., Platt-Aloia, K., Mudd, J.B. et al. Ultrastructural and lipid changes associated with the aging of citrus leaves. Protoplasma 94, 221–233 (1978). https://doi.org/10.1007/BF01276773
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DOI: https://doi.org/10.1007/BF01276773