海南山栏稻遗传基础的研究Ⅱ．核型与异染色质特征

Genetic Basis of Shanlan Upland Rice Ⅱ.Karyotype and characteristics of heterochromatin

海南山栏稻体细胞染色体数与普通栽培水稻相同，即２ｎ＝２４，并同属２Ｂ核型。山栏稻染色体组中有９对中部着丝点染色体（水稻对照品种为５－６对），１－２对亚中部着丝点染色体（水稻为４－５对）．１－２对亚端部着丝点染色体。这表明山栏稻核型比水稻更为对称。山栏稻染色体组的异染色质含量平均为４６．１％，低于水稻对照（平均为５０．１％）。异染色质在染色体上的分布形式与水稻对照基本相同，多数是位于着丝点两侧（或再加一个短臂），只有少数（１－２对）染色体表现异染色质化。

Shanlan upland rice was found to have similar somatic chromosome number to commonrice ( 2n =24). In the genomes of the Shanlan upland rice were observed chromosomes 9 pairsmetacentric,1-2 pairs submetacentric and l-2 pairs subtelocentric, while the chromosomes inthe genomes of the common rice were 5-6pairs metacentric and 4-5pairs submetacentric, TheShanland upland rice had a heterochromatin content averaging 46.1%as against 50.1%in com-mon rice.