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通过对双－３、双－１３、陆５２和阿里希斯尼４个多胚水稻品系的研究，结果表明多胚水稻的双苗（多苗）性状表达受萌发条件的影响：１．种子去壳后浸种催芽较未去壳浸种催芽的双苗率平均提高２．７％，最高为３．８％。在组织培养条件下萌发，其双苗率的提高更明显，平均为４．４％，最高为７．４％（双苗率由４１％提高到４８．４％）；２．在接种前对种子不同温度的预处理研究表明，温度对双苗率也有较大的影响：二个粳稻品种和籼稻品种双－１３的最适温度为５０℃；籼稻品种双－３的最适温度为３０℃，在此温度预处理后，最高双苗率由４１．０％提高到７５．０％。
The results of the research on four polygenetic rice lines with double - 3, double - 13, land 52 and Allisisi showed that the expression of the double seedling (multi - seedling) in polyembryonic rice was affected by the germination conditions: 1. The rate of double-seedlings increased by 2.7% and the highest was 3.8% on the average after the seeds were soaked and germinated. In the tissue culture conditions germination, the double-seedling rate increased more significantly, with an average of 4.4%, the highest was 7.4% (double-seedling rate increased from 41% to 48.4%); Pretreatment of seeds at different temperatures prior to inoculation showed that the temperature had a significant effect on the double seedling rate as well: the optimum temperature of double -13 for two japonica cultivars and indica cultivars was 50 ℃; The temperature was 30 ℃. After pretreatment at this temperature, the highest seedling rate increased from 41.0% to 75.0%.