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- Author or Editor: William Gilbert x
- HortScience x
Abstract
Colorimetric determination of hydroxyproline in acid hydrolysates of ‘Valencia’ orange (Citrus sinensis [L.] Osbeck), ‘Carrizo’ citrange (C. sinensis × Poncirus trifoliata [L.] Raf.), ‘Cleopatra’ mandarin (C. reticulata Blanco), and rough lemon (C limon [L.] Burm. f.) indicated 14 to 71 μg of hydroxyproline per g of oven-dried leaf tissue. Cold-hardening and growth regulator treatments of different citrus cultivars changed the concentration of hydroxyproline in the leaves. Cultivars with greater concentrations of hydroxyproline before cold-hardening were also more tolerant of freeze conditions after cold-hardening.
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HortScience