Physiological variations in herbicide tolerance among Chickpea (Cicer arietinum L.) genotypes
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Date
2016
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Punjab Agricultural University, Ludhiana
Abstract
The present investigation was carried out in field area of the Department of Plant Breeding
and Genetics, Punjab Agricultural University, Ludhiana during rabi season 2015-16 to
evaluate the variations in herbicide tolerance in chickpea genotypes. A field experiment was
conducted in factorial randomized block design using twenty four genotypes and three
treatments (unsprayed, imazethapyr and carfentrazone-ethyl). According to our studies, both
herbicides caused change in phenological development of plants. The early flowering and
maturity was found in herbicide tolerant genotypes. Significant variations were recorded in
physiological parameters (leghaemoglobin content, leaf area index, photosynthetic efficiency,
hill reaction activity, cellular respiration and malondialdehyde content) during reproductive
phase displaying that herbicides affect physiological processes in the plant. There was an
upregulation in malondialdehyde content in sensitive genotypes. A negative effect of
herbicidal treatments on yield attributes (yield/plant, pods/plant and 100-seed weight) was
observed. From physiological parameters and yield attributes, genotypes were assorted as
tolerant and sensitive from each treatment. Six genotypes (three sensitive GL 12021, GLW
125, GL 27023 and three tolerant GLW 11, GL 10047, PDG 4) following carfentrazone-ethyl
treatment and (three sensitive JG 1362, GL 28203, GL 12021 and three tolerant GL 11026,
GLW 44, PBG 5) following imazethapyr treatment were further evaluated for biochemical
evaluation. It was shown that during reproductive phase, total soluble sugars, total proteins,
total free amino acids and proline content in leaves were elevated in tolerant genotypes of
each treatment. Anti-oxidative defence system was studied from leaves and it was found to be
hiked in tolerant genotypes. This work emphasizes that genpotypes GLW 11, GL 10047, PDG
4 and GL 11026, GLW 44, PBG 5 are apt for the post-emergence herbicide tolerance.
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