🧬 Lentil — Genetics and Breeding

This lesson covers lentil genetic architecture and practical breeding strategy for disease resistance, maturity adaptation, and seed quality improvement.

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Origin and Botany

Lentil (Lens culinaris Medik., 2n = 2x = 14) belongs to the family Fabaceae and is one of the oldest domesticated crops, with archaeological evidence dating back to 8000 BC in the Near East. The primary centre of origin is the Near East (present-day Turkey, Syria, Iraq). India is the largest producer and consumer of lentil in the world, with major production in Uttar Pradesh, Madhya Pradesh, and Bihar. Lentil is classified into two types based on seed size: Macrosperma (large-seeded, >6 mm diameter, flat, green/brown seed coat) and Microsperma (small-seeded, <6 mm diameter, convex, red/orange cotyledons). Indian lentils are predominantly microsperma types locally known as masoor. Lentil is a self-pollinated crop with natural outcrossing typically below 1%.

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Genetics

Lentil has a relatively small genome (approximately 4 Gbp) among legumes. Key genetic traits include seed coat colour (controlled by multiple genes with epistatic interactions), cotyledon colour (red cotyledon is dominant over yellow, controlled by the Yc gene), plant height, and days to flowering. Rust resistance is governed by both major and minor genes. Single dominant gene resistance to rust has been identified in certain ICARDA germplasm lines. The inheritance of Fusarium wilt resistance follows oligogenic control. Linkage maps based on SSR, RAPD, and SNP markers have been constructed, and QTLs for yield components, disease resistance, and quality traits have been mapped.

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Breeding Objectives and Methods

The primary breeding objectives include rust resistance (Uromyces viciae-fabae), which is the most devastating disease causing yield losses up to 70%. Wilt resistance (Fusarium oxysporum f. sp. lentis) and Stemphylium blight resistance are also important. Early maturity (90-100 days) is critical for fitting lentil into rice-based cropping systems of eastern India and for escaping terminal heat stress. Development of bold seeded types with large seed size and attractive seed coat colour fetches premium market price. High protein content (24-28%) and improved iron and zinc content for biofortification are quality targets. Tolerance to drought, waterlogging, and salinity is increasingly important under changing climate scenarios.

Breeding methods employed include pedigree selection, single seed descent (SSD) for rapid generation advancement, and backcross method for transferring specific resistance genes. Hybridization is performed by emasculating unopened flower buds and applying pollen from the desired male parent. Mutation breeding using gamma rays and EMS has been successful in generating variability for seed size, plant height, and early maturity. Notable Indian varieties include L 4076 (Pant L 406), IPL 316, HUL 57 (rust resistant), KLS 218 (bold seeded), and PL 8 (early maturing). IIPR Kanpur and ICARDA are the leading centres for lentil improvement. Marker-assisted selection for rust resistance using linked SSR markers is being routinely applied in advanced breeding programmes.

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Summary Cheat Sheet

Quick Recall Points

• Lentil is 2n=14 and predominantly self-pollinated.
• Broad groups: macrosperma and microsperma.
• Priority traits include rust resistance, early maturity, and bold seed type.

Exam Traps

• Do not confuse seed coat type with cotyledon colour inheritance.
• Early maturity in lentil is a system-fit trait, not only a yield trait.

References

2 sources • [1] [2]

[1]

Lentil: Botany, Production and Uses

Book

[2]

ICAR pulse research network

Official