Indian Society of Genetics & Plant Breeding

Morpho-physiological and biochemical characterization of maize genotypes under nitrogen stress conditions

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Forty maize inbred lines were assessed at seedling,
vegetative and flowering plant growth stages for nitrogen
use efficiency under nitrogen sufficient and deficient soil
conditions. Significant variations were observed in the
morpho-physiological and agronomical traits. Inbred lines
were classified into two major clusters based on the
response of morphological and physiological traits to
nitrogen limiting conditions. Cluster 1(C1) I included DMI
4, DMI 5, DMI 22, DMI 27 and DMI 56 inbred lines-derived
from the drought or thermal tolerant parents HKI335 and
LM17 with less reduction in growth-related parameters as
compared to cluster CII inbred lines, which were derived
from sensitive genotypes MGUD22 and HKI1015wg8. The
enzymatic activities of nitrate reductase (NR) and glutamine
synthetase (GS) were observed to be more critical for
screening in the early growth stage. The identified inbred
lines have the potential for developing maize hybrids with
improved nitrogen use efficiency.

Keywords: Maize, inbred line, SPAD, Nitrogen Harvest Index, anthesis-silking-interval

Info

Year: 2021
Volume: 81
Issue: 2
Article DOI: 10.31742/IJGPB.81.2.8
Print ISSN: 0019-5200
Online ISSN: 0975-6906

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