Metabolic changes in roots and nodules of lentil genotypes with imazethapyr treatment
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Date
2021
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Punjab Agricultural University, Ludhiana
Abstract
Lentil (Lens culinaris) is an important pulse crop. Weed infestation affects the yield of lentil
as it is a poor competitor of weeds due to their short stature and sluggish growth rate. The
present study was to screen lentil genotypes of imazethapyr treatment. Twenty lentil
genotypes were sown under three treatments: weed check (T1), weed-free (T2) and sprayed
with imazethapyr (T3). Four contrasting genotypes comprising of two imazethapyr tolerant
(LL1397 and LL1612) and two susceptible (Flip 2004-7L and PL07) genotypes were selected
based on their morpho-physiological traits, number of pods/plant, 100-seed weight and yield.
Activity of acetolactate synthase (ALS), carbon (alkaline/acid invertase, sucrose synthase and
malate dehydrogenase) and nitrogen (glutamate dehydrogenase, glutamine synthetase and
glutamate synthase) metabolizing enzymes were analyzed in four contrasting genotypes in
both roots and nodules under three treatments. Imazethapyr inhibits the synthesis of
acetolactate synthase (ALS), an enzyme responsible for the synthesis of branched-chain
amino acids in plants. Higher activity of ALS in roots and nodules of LL1397 and LL1612
might be responsible for their better plant growth as compared to Flip 2004-7L and PL07.
Higher activity of alkaline invertase, sucrose synthase, malate dehydrogenase (MDH),
glutamate dehydrogenase (GDH), glutamine synthetase (GOGAT) and glutamate synthase
(GS) in both roots and nodules might be helping their growth and nodule metabolism in
LL1612 and LL1397 as compared to Flip 2004-7L and PL07 lentil genotypes.
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Citation
Alisha (2021). Metabolic changes in roots and nodules of lentil genotypes with imazethapyr treatment (Unpublished M.Sc. thesis). Punjab Agricultural University, Ludhiana, Punjab, India.