Pachytene Pairing in Relation to Pollen Fertility in Five Cultivars of Cassava

抄録

Pachytene pairing in relation to pollen fertility was studied in five cultivars of cassava. The two highly pollen fertile clones showed only normal pachytene and later meiotic divisions were also normal. However, in the partially pollen fertile clones different pachytene abnormalities like non-pairing, deletion, duplication and inversion were found in different chromosomes. In C1-1443 as many as five bivalents showed aberrant pachytene pairing. Though there was a slight reduction in chiasma frequency, later divisions were normal. Based on the extent of pachytene abnormalities in different clones, reduction in chiasma frequency, meiotic sequence and normal tapetum development and microsporogenesis, it is concluded that pachytene behaviour had a statutory role in determining the ultimate pollen fertility in cassava.