| Pak. J. Bot., 32(1): 69-75, 2000. | Back to Contents | ||||
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Updated: 08-04-11 | ||||
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GENETIC IMPROVEMENT AND CORRELATION IN CORN NIAZ AHMAD KHAN, AFSARI SHARIF*, ABDUL GHAFOOR**, MUHAMMAD ASLAM** AND MUHAMMAD ASHRAF**
Abstract: Four population of maize drived from a broad based population
CIMMYT 31 on the basis of silking and black layer formation after four breeding
cycle were evaluated for 10 quantitative characters. Significant improvement alongwith
expected transgressive segregants for maturity and yield potential was observed
and suggested to be exploited for maize production. Major emphasis was given to
develop different populations on the basis of maturity phases and correlation
of BLF with other physiological and agronomic charaters revealed significant association
of BLF with silking in EE, EL and LE populations but insignificant correlation
in LL. The characters like Kernels per row, grain weight, kernels per plant, grain
yield and leaf area did not exhibit any significant association between BLF and
other yield contributing characters which might be due to linkage among genes
responsible for phenotypic expression of these characters which can be broken
by using selective diallel following recurrent selection. There was a reduction
in grain yield in early population whereas, high variance observed in LE population
alongwith early maturity suggested a potential source for earliness and high yield
which could be attained by repeating more breeding cycles and finally to develop
a composite variety within each population especially in LE population. Wheat Research Station (Rainfed), Murree Road, Rawalpindi, Pakistan.
Department of Biological Sciences, Quaid-e-Azam University, Islamabad, Pakistan. |
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