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由于本省无性系种源较少,现存的无性系产量偏低,造成选种材料贫乏.为了丰富选种材料,近五年来我们从广西、湛江、海南等地引进以抗寒为主的各类型无性系276个.其中国外品系23个,国内品系253个(包括海南64个、湛江115个、广西48个、云南22个、四川3个、本省1个).除了布置各类型系比区20个外,还布置了品种保畄园及材料圃各一个.由于几年来冬季气候偏暧难于准确鉴定,仅把寒害较重的79/80年冬调查结果整理如下.
In order to enrich the selection of materials, in the past five years, we have introduced various types of plants that are mainly cold-resistant from Guangxi, Zhanjiang, Hainan, etc., due to the low provenance of clones in the province and the low production of existing clones 276 clones, including 23 foreign breeds and 253 domestic breeds (including 64 in Hainan, 115 in Zhanjiang, 48 in Guangxi, 22 in Yunnan, 3 in Sichuan and 1 in the province) In addition, a variety of conservation parks and material nurseries have also been set up, and as a result of the difficulty in accurately identifying winter biases in recent years, only the results of the 79/80 winter survey with heavy chill injury are summarized below.