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在2005-2009年期间,利用从中国南部和西南部收集的80个不同的膏桐地理种源,在西双版纳建立膏桐种质资源圃30亩;在圃内开展其生物学特性和农艺性状的同时,对其中表现良好的6个地理种源做了进一步选择和培育。结果表明:80个种源的2年生时平均直径、树高和树冠分别为7.6cm、167cm和114cm,种子千粒重为0.676(0.477～0.879)kg;在这些种源中,根据单株产量和种子含油率的情况,对6个表现较好的种源开展了小规模试验,2年生时平均单株产量0.34kg,3年生时达1.38kg;在试验中,有一个种源表现尤为突出,自挂果以来种子产量逐年增加,二、三、四年生林分每公顷干种子产量分别为964.3kg、2000.6kg、2858.7kg,种子含油率40%～42%。另外,还利用野外发现的膏桐突变体成功地育出了膏桐新品种。以此为父本与其他种源杂交产生的后代,种子含油率较对照提高6个百分点,杂种种子含油率达41.2%。
During the period 2005-2009, a total of 30 acres of germplasm resources were planted in Xishuangbanna using 80 different species of Paulownia collected from southern and southwestern China; the biological characteristics and agronomic traits At the same time, we further selected and nurtured the six well-proven geographical provenances. The results showed that the mean annual diameter, tree height and crown of 80 provenances were 7.6cm, 167cm and 114cm, respectively, and the mean grain weight was 0.676 (0.477 ~ 0.879) kg for 80 provenances. In these provenances, The results showed that the average yield per plant was 0.34kg at 2-year-old and 1.38kg at 3-year-old. In the experiment, one provenance was particularly prominent The yield of seed has increased year by year since the fruiting, and the dry seed yield per hectare for the second, third and fourth annual stands is 964.3kg, 2000.6kg and 2858.7kg respectively, and the seed oil content is 40% -42%. In addition, the new species of albacore was successfully bred by using the mutant of P. juncea found in the wild. As a result of progeny cross with other provenances, the oil content of seeds increased by 6% compared with the control, and the oil content of hybrid seeds reached 41.2%.