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本枝变系1977年湖北省恩施市遭受百年罕见大冻后从原七里公社红旗七队8年生温州蜜柑园(红桔砧)中选出。它本是从其母树嫁接部位抽生的一个徒长枝,此徒长枝直立向上生长成高2.5米、冠幅2米的新树体,使原母树成为其下部的一个分枝。该新树体大冻前已结果3年,经历1977年1月30日-12.3℃低温后,叶片少量脱落,部分嫩梢冻死,属一级冻害,当年还开了花。而同株共存的分枝和同园植株的主侧枝均被冻死,属四级冻害。
Benzhi change line 1977 Enshi City, Hubei Province suffered a rare freeze after a hundred years from the former Qili commune red flag seven teams 8-year-old Wenzhou Orange Garden (red anvil) selected. It was originally a long branch sprouted from the grafting of its mother tree, which grew upright up to 2.5 meters high with a 2-meter-wide new tree, making the original tree a branch of its lower part. The new tree has been frozen for 3 years before the big freeze, after January 30, 1977 -12.3 ℃ low temperature, a small amount of leaves off, part of the tender shoots frozen to death, is a frost damage, when the flowering also opened. The coexistence of the same branch with the same plant and the main branches are frozen to death, is a four frost damage.