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１９９５～１９９７年对８个柚品种的耐寒性及其机理进行了研究．结果表明：柚类忍受的临界低温为－３～－５℃，因品种而异．沙田柚、度尾蜜柚、泰国柚等在－３℃１２ｈ电渗率已达５０％以上，而王官溪蜜柚、霞河蜜柚在－５℃１２ｈ电渗率才达５２％，文旦柚、楚门文旦、坪山柚电渗率介于两类之间．但低温持续时间长，即使在－１℃（２４ｈ）王官溪蜜柚电渗率亦高达５１％．柚叶片组织细胞结构紧密度、可溶性蛋白质含量、游离脯氨酸含量、超氧物歧化酶活性、线粒体膜Ｎａ＋－Ｋ＋ＡＴＰ酶活性、束缚水／自由水比值等与柚品种的耐寒性呈正相关．
The cold tolerance and its mechanism of 8 grapefruit cultivars from 1995 to 1997 were studied. The results showed that the critical low temperature endured by pomelo was -3 ~ -5 ℃, which varied with different varieties. Phytotopes of Shatian pomelo, Tailou pomelo and Thai pomelo reached more than 50% at -12 ℃ for 12h, while the Wangguo pomelo and Xiahe pomelo reached 52% at -5 ℃ for 12h, Truman Pomelo, Pingshan pomelo electricity between the two types. But the low temperature duration, even at -1 ℃ (24h) Wang Guanxi honey pomelo electro-osmosis rate as high as 51%. The tightness of cell structure, soluble protein content, free proline content, superoxide dismutase activity, mitochondrial membrane Na + -K + ATPase activity, irreducible water / free water ratio were positively correlated with the cold tolerance of pomelo varieties.