Searching chromosomal landmarks in Indian lentils through EMA-based Giemsa staining method

Area of Science:

• * Botany
• * Genetics
• * Agronomy

Background:

• * Lentil (Lens culinaris) is an ancient, protein-rich legume crop with significant cultivation in India.
• * Six wild and one cultivated species exist, all sharing a 2n=14 chromosome count.
• * Understanding interspecific relationships is crucial for lentil breeding and germplasm utilization.

Purpose of the Study:

• * To identify chromosomal landmarks in five Indian lentil species using a specific staining method.
• * To analyze gametic chromosomes, tendril formation, and seed morphology for interspecific relationship assessment.
• * To establish distinct groupings among lentil species based on cytological and morphological traits.

Main Methods:

• * Enzymatic maceration and air drying (EMA)-based Giemsa staining for chromosome analysis.
• * Karyotypic analysis to identify chromosomal landmarks, including specific chromosome types.
• * Meiotic analysis and observation of tendril formation and seed morphology.

Main Results:

• * Lens culinaris, Lens orientalis, and Lens odemensis exhibit intercalary sat chromosomes with similar karyotypes.
• * Lens nigricans and Lens lamottei possess unique terminal sat chromosomes, serving as distinct landmarks.
• * Lentil species were categorized into two groups based on chromosomal features, tendril development, and seed morphology.

Conclusions:

• * Terminal sat chromosomes in Lens nigricans and Lens lamottei are significant chromosomal landmarks.
• * Cytological and morphological data effectively differentiate the studied lentil species.
• * Findings can enhance conventional and biotechnological lentil breeding and hybrid identification.