Tolerance to post-emergence herbicide Imazethapyr in chickpea

Abstract

The present research work aimed at identification of
sources of tolerance to herbicide Imazethapyr for their
possible utilization in development of herbicide tolerant
chickpea. Sixty five genotypes (55 desi and 10 kabuli)
screened included accessions from ICRISAT core collection,
advanced breeding lines and cultivars. The herbicide
tolerance score ranged from 1.9 to 5.0. Nine tolerant to
moderately tolerant and three susceptible genotypes were
further evaluated under control and sprayed condition.
Genotype x environment interactions were observed for
days to 50% flowering, NDVI, days to maturity, seed yield,
biomass, harvest index, 100-seed weight and branched
chain amino acids (BCAA) viz., valine, leucine and isoleucine
content. Highly significant reduction in seed yield was
observed in all the genotypes except ICCV 10, ICCL 82104
and ICC 1710 as revealed by pairwise comparison of means
using Tukey’s test. The spraying of herbicide reduced the
total biomass production. Analysis of BCAA content in
sample revealed non-significant differences for percent
valine content in ICCIL 04001, ICCV 00305, ICCV 96003 and
ICCL 82104, for isoleucine content in all the genotypes
except, ICCV 3 and ICCV 96003 and for leucine content in
case of ICCV 03407, ICCIL 04001, ICCV 10, ICCV 96003, ICC
1710, ICCV 00108 and ICCL 82104. The genotypes tolerant
to post-emergence herbicide Imazethapyr identified based
on non-significant reduction in the yield attributes and
BCAA content in the sample were ICC 82104, ICCV 10, ICCV
96003, ICC 00305 and ICC 1710. These genotypes can be
used to study the genetics of herbicide tolerance in chickpea
and in breeding programs for developing lines with
tolerance to post-emergence herbicide Imazethapyr.