Indian Society of Genetics & Plant Breeding

Physiological and morphological evaluation of MABB derived lines under drought stress in bread wheat (Triticum aestivum L. em. Thell.)

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The present study was conducted to assess the
performance of advanced lines developed through marker
assisted backcross breeding (MABB) program for different
morphological and physiological traits under drought
stress. A popular widely grown but drought susceptible
Indian bread wheat variety, HD2733 was improved by
transferring QTLs linked to traits like chlorophyll content,
canopy temperature, normalized difference vegetation index
(NDVI) and grain yield under drought stress, from a known
drought tolerant variety, HI1500. The backcross derived lines
were phenotyped at BC2F3 and BC1F4 generation and a
significant difference (at P<0.05) was observed for traits
such as NDVI, chlorophyll content, thousand kernel weight
and grain yield/plot at phenotypic level. Few backcross
derived lines showed enhancement over recipient parent
for morpho-physiological traits as well as yield under
drought stress. Distinctness, uniformity and stability (DUS)
characters in selected backcross derived lines were similar
to the recipient parent indicating higher recovery of the
recipient parent genome. We selected 20 lines in BC2F3 and
9 lines in BC1F4 (with average yield of 265.39gm/plot) on
the basis of their superior performance against parental
genotypes HD2733 (242.31gm/plot) and HI1500 (253.74gm/
plot). Among the 29 lines, five lines were identified to be
superior during assessment in multi-location yield trials.
 

Keywords: QTLs, morpho-physiological traits, drought stress, DUS characters

Info

Year: 2018
Volume: 78
Issue: 4
Article DOI: 10.31742/IJGPB.78.4.3
Print ISSN: 0019-5200
Online ISSN: 0975-6906

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