Abstract:

According to the counting the chromosome numbers of 18 species of leguminous trees(Leguminosae), the chromosome numbers have relationship with nodulation in some degree in the leguminous trees.The chromosome numbers of 10 species of leguminous trees which are not nodulade in the field except for Cassia occidentalis are all 28 and can be divided integrally by 7. These trees are Cassia sophera, C. canymbosa, C. bicapsularis, C. hirsnta, C. suffruticosa, C. siamea, Zenia insignis, Gleditsia sinensis in Caesalpinioideae and Sophora japonica in Papilionoideae. The chromosome numbers of C. occidentalis which is in Caesalpinioideae is 26. Each of the chromosome number of 8 species of leguminous trees which can be nodulated is not 28. These 8 species of leguminous trees which can be nodulated are as follow: chromosome numbers of Albizia julibrissin, Acacia dealbata, Acacia cunnihami and Acacia mangium in Mimosoideae are all 26, chromosome numbers of Sophora davidii in Papilionoideae is 18, chromosome numbers of Amorpha fruticosa in Papilionoideae is 40, and chromosome numbers of Robinia pseudoacacia and Cajanus cajan in Papilionoideae are 22. These chromosome numbers all are not divided integrally by 7.

Key words: leguminous trees(Leguminosae), chromosome number, nodulation