2000•Journal of Zhejiang Agricultural UniversityRequires access
Studies on cold tolerance in navel orange strains
Chen Li
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Abstract
The cold tolerance of 6 navel orange strains ( Citrus Sinensis (L) Osbeck. ) was determined. The result showed that through 10 hours treatment at -7 ℃, the relative conductivity of 954 navel orange was less than 50%, and LT 50 of it was -6.58 ℃. 954 navel orange was also found to have most content of soluble sugar and free proline, highest SOD and CAT activity. Among 6 navel orange strains, 954 navel orange has the best cold tolerance. Next to it is omishima and seike navel orange came from Japan, and bonnaza, new hall and its select line 952 navel orange came from America, have the weak cold tolerance.