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利用同功酶遗传标记测定了英国南部Ｕｎｄｅｒｄｏｗｎ落叶松杂种种子园商品种子的杂种率。欧洲落叶松无性系种子杂种率为６５％；日本落叶松为１９％。检测了种子园中各配子间的支配状况。两亲本树种的繁殖能力及花期的差异是两树种杂种比例存在显著差异的原因。
Using the isoenzyme genetic markers to measure the South Africa underdown Larix hybrid seed orchard hybrids seed rate. European Larch Clone seed hybrid rate of 65%; Japanese larch 19%. The dominating status of gametes in the seed orchard was examined. The reproductive capacity and the difference of flowering date between the two species were the reason for the significant difference between the two species.