Evaluation of 99 S1 lines of maize for inbreeding depression

• Published in: Pakistan journal of agricultural sciences Vol. 47; no. 3; pp. 209 - 213
• Main Authors: Ahmad, M. (KPK Agricultural Univ., Peshawar (Pakistan)), Khan, S. (Agricultural Research Station, Mansehra (Pakistan)), Ahmad, F. (Agricultural Research Station, Mansehra (Pakistan)), Shah, N.H, Akhtar, N
• Format: Journal Article
• Language: English
• Published: 2010
• Subjects: CROP YIELD; EVALUATION; GROWTH; HEIGHT; INBREEDING DEPRESSION; MATURITY; POLLEN; PROGENY; STATISTICAL METHODS; YIELD COMPONENTS; ZEA MAYS
• ISSN: 0552-9034

The research was conducted to evaluate the performance of S1 lines for inbreeding depression regarding different parameters, using maize variety Azam. The maize variety was self-pollinated for one generation in spring season and in the next sowing season 99 S1 lines obtained from selfing was sown with a parental line. Days to silking, pollen-shedding, plant height, ear-height, ear-length, ear-diameter, number of ears/row, kernel rows/ear and 100 kernel weight showed inbreeding depression with varying degrees while yield kg/ha showed severe inbreeding depression with an average of 362.08 kg/ha. Average value of inbreeding depression for days to silking and pollen-shedding was calculated as 2.02 and 2.21 days, respectively. Average values of inbreeding depression for plant height and ear-height were recorded as 21.50 cm and 4.87 cm, respectively. While, for ear-length, ear-diameter, number of ears/row, kernel rows/ear and 100 grain weight, the average value of inbreeding depre