PJB-2000-12
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.
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