脐橙品系耐寒性的研究

Studies on cold tolerance in navel orange strains

对 6个脐橙品系耐寒性的测定结果表明 ,954号脐橙在 - 7℃下处理 10 h,相对电导率小于50 % ,LT50 达 - 6 .58℃ ;可溶性糖和游离脯氨酸含量最多 ,SOD与 CAT活性最高 ,表现出最强的耐寒性 .来自日本的大三岛和清家脐橙耐寒性其次 ,而引自美国的朋娜、纽荷尔及其选系

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.