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研究表明,龙眼发生焦核是一种遗传变异现象,不同变异单株系之间差别大,而某一单株系则具有一定的稳定性,其变化幅度与年气候变化及每穗果数目的多少有密切关系。这些焦核龙眼的胚胎发育开始是与大、中核型一样,但一般在授粉后40天左右开始败育,种子腔干涸,胚胎逐步坏死,种皮皱缩,果肉正常生长。当焦核果完全成熟前,种胚已经坏死,因而播种无法得到焦核实生苗。取1.5～4.5mm大小的白色、部分褐或整体浅褐的胚进行离体培养,可以得到焦核苗;大于3mm的胚,多可在20天内直接萌发得到一株焦核苗;小于3mm的胚常产生胚状体,可在 3～5个月内取得一株焦核无性系。胚培养将为焦核龙眼选育开创一条新途径。
Studies have shown that the occurrence of coking nucleus in longan is a phenomenon of genetic variation, different strains of different strains vary greatly, and a single strain has a certain stability, and its magnitude of change with the annual climate change and the number of per fruit How much is closely related. The development of embryos of these pyranuclear longan began with the same as that of the large and medium karyotypes, but they usually start to be aborted after 40 days of pollination, the seed cavity is dried up, the embryos are gradually necrotic, the seed coat is shrunken and the pulp grows normally. The seed embryo is already necrotic before it can be fully mature, and the seedlings can not be seeded with coke kernels. Take 1.5 ~ 4.5mm size of white, brown or brown light whole embryos in vitro culture, you can get coke seedlings; more than 3mm embryos, and more can be directly germinated within 20 days to get a coke seedlings; less than 3mm Embryo often produce embryoid body, in 3 to 5 months to obtain a nuclear coke clones. Embryo culture will establish a new way for the coke core longan breeding.