人爲倍數性 林木에 關한 硏究 Ⅹ. 4倍體 아까시나무의 成熟分裂에 있어서 染色體 接合과 그 次代의 몇 形質에 對하여

Studies on Artificial Polyploid Forest Trees Ⅹ. On Chromosome Pairing in Meiosis of Colchitetraploid Robinia pseudoacacia L. and Some Characteristics of the Progenies

To investigate the causes of low seed fertility of colchitetraploid of black locust which was induced to be used for tree improvement program observations were made on the chromosome configuration in meiotic cell division and cytological characteristics and also on the growth habit of the progenies of the colchitetraploid. The results are summarized as follows. 1. In the meiotic cell division of tetraploid, the percentage of the occurrence of 20_(II) chromosomes was 21-64% and many univalent and multivalent chromosomes were observed in metaphaseⅠ, and laggard chromosomes, chromosome bridges and early separation of chromosomes were occurred with higher frequency in tetraploid than in diploid. It was considered that those phenomena cause irregular meiotic cell division in the pollen tetrads stage consequently resulting in low pollen fertility. 2. In the progenies of colchitetraploid, diploids, triploids, tetraploids and aneuploids were produced. And, the triploid, tetraploid and aneuploid progenies are lower in growth rate compared to diploids in their 2-year seedling stage, however the length of stomata and fibril are increased in those polyploid.