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PHYSIOLOGICAL BASIS FOR GENETIC DIVERSITY IN MAIZE (Zea mays L.)

KrishiKosh

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Title PHYSIOLOGICAL BASIS FOR GENETIC DIVERSITY IN MAIZE (Zea mays L.)
 
Creator BANSILAL, D
 
Contributor VISHNU VARDHAN REDDY, D.
 
Subject Physiological, genetic, diversity, maize
 
Description The present investigation was undertaken to estimate the genetic variability
and genetic diversity in maize and to carry out yield component analysis through
estimation of seed characters, seedling vigour and physiological parameters, yield
and yield components in 3 Parents, 2 Hybrids, 3 Composites, 2 Sweet corn and 2
Pop corns. The laboratory and field experiments were carried out at Department of
Plant Physiology and Student’s Farm, College of agriculture, Rajendranagar,
Hyderabad.
There was a significant difference between genotypes for all the characters,
which revealed wide range of variability and high heritability. The genetic advance
as percent of mean was high for grain yield per plant, ear height, plant height,
number of kernels per row, number of kernel rows per ear, ear length, ear girth and
100 grain weight indicating additive gene action for these traits. It was observed in
hybrids for seed weight, embryo dry weight, endosperm dry weight and embryo to
endosperm ratio which has been attributed to the nourishment provided to mother
plant in the form of large seed.
Higher per se estimation of yield per plant, dry weight of cob, total grain
filling rate, number of kernels per cob, number of kernels per row, total dry weight
of plant, dry weight of leaves, dry weight of stem and Crop Growth Rate (CGR),
Leaf Area Index (LAI) and plant height of Parents, Hybrids and varieties have
directly contributed to their diversity. In addition, these traits were also positively
and highly significantly correlated with biological yield and grain yield.
Cob length, harvest index, 100 grain weight, grain filling period, cob girth,
and embryo dry weight had medium diversity with moderate correlation with grain
yield and biological yield suggesting that these physiological parameters might be
playing an equal and important role along with genetic factors in diversity.
Endosperm dry weight, tassel dry weight, Net Assimilation Rate (NAR) and
Relative Growth Rate (RGR) had least difference between hybrids and parents in
per se estimated values resulting in low or negative diversity indicating meager or
no role of these factors for the diversity manifestation.
 
Date 2016-07-30T10:31:45Z
2016-07-30T10:31:45Z
2009
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/70210
 
Language en
 
Relation D8528;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY RAJENDRANAGAR, HYDERABAD