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期 刊 ：植物遗传资源学报 2015年 16卷 4期

关键词：3种披碱草属牧草；交配系统；花粉-胚珠比；杂交指数；结实率；

Keywords:3 Elymus spp., mating system, pollen-ovule ration, outcrossing index, seed setting rate,

摘 要 ：本文通过测定3种披碱草属牧草的花粉-胚珠比（P/O值）、杂交指数（OCI），结合不同授粉方式下这3种牧草的结实率，探讨这3种披碱草属牧草的交配系统, 为披碱草属牧草杂交育种、丰产栽培等提供理论依据。结果表明，老芒麦、麦薲草和披碱草花粉-胚珠比（P/O值）均处于31.9～396.0，交配系统属于兼性自交；杂交指数OCI值为2，交配系统也属于兼性自交；结实率统计表明，以自交为主，异交可育。因此，3种披碱草属牧草的交配系统属于兼性自交类型。

Abstract:To provide a theoretical basis for crossbreeding, yielding cultivation of Elymus, an experiment was conducted to study mating system of 3 Elymus spp. by pollen-ovule ration (P/O value), outcrossing index and seed setting rate under different pollination methods. The results showed that the pollen-ovule ration (P/O value) was 31.9-396.0, mating system was the facultative autogamy. Outcrossing index ( OCI ) value is 2, was also the facultative autogamy. Seed setting rate showed that 3 Elymus spp. was selfing, out-cross compatible. As a result, mating system of 3 Elymus spp. belong to the facultative autogamy.

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