Genetic variation for tolerance to post-emergence herbicide, imazethapyr in lentil (Lens culinaris Medik.)

ABSTRACT

Weeds pose a serious constraint to lentil production. Identification and deployment of post-emergence herbicide tolerance in improved varieties can help reduce the production cost and increase the productivity and area under lentil cultivation. Imazethapyr, a post-emergence herbicide was tested on 180 lentil genotypes for two consecutive years. Significant variation among the genotypes was observed for tolerance to imazethapyr. On a 1–5 scale, 12 genotypes were found tolerant, 46 moderately tolerant, 112 sensitive and 10 highly sensitive during the first season, and 11 genotypes were found tolerant, 51 moderately tolerant, 110 sensitive and 8 highly sensitive during the second season. Based on the first year’s result, 30 genotypes, representing tolerant, moderately tolerant, sensitive and highly sensitive reactions, were evaluated to determine the effect of herbicide on morpho-physiological and yield traits. The adverse effect of imazethapyr was significant on growth and yield attributes of lentils. Five genotypes namely LL699, LL1397, IPL406, EC78452 and LL1203 demonstrated tolerance to imazethapyr with limited phytotoxic effect on various morpho-physiological traits. These genotypes showed less reduction (<19%) for seed yield in imazethapyr treated plots as compared to control. These genotypes offer scope for developing post-emergence herbicide tolerant cultivars in lentil.

KEYWORDS:

• Herbicide tolerance
• morpho-physiological trait
• weed flora
• chlorophyll content

Acknowledgments

The authors would like to acknowledge National Bureau of Plant Genetic Resources (NBPGR), New Delhi, India and International Center for Agricultural Research in the Dry Areas (ICARDA), Rabat, Morocco for providing germplasm for evaluation. This work was undertaken as part of, and funded by, the CGIAR Research Program on Grain Legumes in collaboration with ICARDA.

Disclosure statement

No potential conflict of interest was reported by the authors.

Supplementary material

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Additional information

Funding

This work was supported by the CGIAR Research Program on Grain Legumes in collaboration with ICARDA [ICARDA fund];