HomeInternational Rice Research Notesvol. 23 no. 1 (1998)

Identifying a new long- duration CMS line (APMS 5A) for coastal regions

R. V. Kumar | P. V. Satyanarayana | M. S. Rao

Discipline: Agriculture, Genetics



Several male sterile lines developed in India belong to the early- to medium- duration group. Hybrids developed using these male sterile lines are also of early to medium growth duration. These hybrids are not suitable for cultivation during the wet season, particularly in the coastal areas of Andhra Pradesh, where long-duration varieties are predominantly grown. We need to develop long-duration rice hybrids to increase rice productivity and fit them into the cropping system. An effort was made to develop long-duration (145-150 d) and stable local cytoplasmic male sterile (CMS) lines. Several testcrosses were made using local long-duration elite lines and IRRI CMS lines to screen the elite varieties for their maintaining or restoring ability. A few long-duration maintainer lines were identified based on pollen and spikelet sterility. MTU4870 was therefore selected and successfully converted into a local cytosterile line in the background of a wild abortive source of cytoplasm through the backcross breeding technique. This line was designated as APMS5A.