Exploring the Diversity of Maize (Zea mays L.) in the Khangchendzonga Landscapes of the Eastern Himalaya

Abstract

The Sikkim Himalaya is a distinguished hub of maize biodiversity, housing a wide range of genetic resources cultivated at altitudes from 300 to 2500 m elevations. From 2010 to 2022, a field investigation combined traditional knowledge and scientific methods to morphologically characterize maize, supplemented by relevant literature. The objective was to evaluate indigenous maize varieties in the region since the 1960s. The research classified maize landraces into four groups: primitive landraces, preserved traditional popcorn races; advanced or derived landraces, selectively bred for desirable traits; recent introductions from other regions; and hybrid maize varieties resulting from crossbreeding. About 31 maize landraces were listed, emphasizing the urgent need for in-depth genetic characterization. Notably, Murali Makai, Seti Makai, Pahenli Makai, Rato Makai, Baiguney Makai, Gadbadey Makai, Tempo-Rinzing, and Lachung Makai adapted well to altitudes of 300–2500 m, showing variations in agronomic and quality traits, as well as resistance to environmental stresses. Primitive maize cultivars in the Northeastern Himalayas of India have generated interest among researchers for their high prolificacy and their link to the origin and evolution of maize. Prioritization at the species level and within specific geographic regions is necessary due to the dynamic demand for germplasm. Conservation of certain maize germplasm is crucial for food security, livelihoods, climate resilience, and research. The study identified potential risks of germplasm extinction or erosion, emphasizing the need for urgent actions to safeguard these genetic resources.