Abstract
ABSTRACT Due to the long dormancy period and hard seed coat, the natural germination percentage of yellowhorn (Xanthoceras sorbifolium) seeds is low, which seriously hinders the large-scale cultivation of the yellowhorn. In this study, the seeds of 26 provenances with different climatic and geographical conditions were collected and the seed germination was tested, which was conducted to determine the effects of seed pretreatment methods on the germination of yellowhorn. This study showed that the germination percentage (GP), mean germination time (MGT) and germination index (GI) of 26 provenances of yellowhorn seeds in different pretreatment methods were highly significant (p < 0.01). The sand storage + clean water and sand storage + PEG almost significantly promote the GP and GI, and reduce the MGT of all provenances, while the pretreatments of warm water and cold water have almost no promoting effect on the GP and GI. In addition, this study indicates that provenances are as important as pretreatments in germination ability. Correlation between germination ability and geo-climatic data of provenances showed that low temperature can improve seed germination ability. This study showed that the seed germination ability of yellowhorn can be improved by using combined pretreatments for provenances with genetically low germination potential.
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