India’s rainfed sorghum improvement: Three decades of genetic gain assessment for yield, grain quality, grain mold and shoot fly resistance

Abstract

Sorghum is a climate-resilient cereal and staple food crop for more than 200 million people in arid and semi-arid countries of Asia and Africa. Despite the economic importance, the productivity of sorghum in India is constrained by biotic and abiotic stresses such as incidences of shoot fly, grain mold and drought. Indian sorghum breeding focused on dual-purpose (grain and fodder), short-duration varieties with multiple resistance/tolerance to pests and diseases and improved nutritional quality (high protein, iron and zinc and low fat). In this context, it is important to ascertain the genetic progress made over 30 years by assessing the efficiency of past achievements in genetic yield potential and to facilitate future genetic improvement. The current study determined the genetic gain in 24 sorghum varieties developed by the national and state level research systems during 1990-2020. The 24 varieties were evaluated for three years (2018-2020) at six locations in Telangana state for yield, nutritional characteristics and tolerance to shoot fly and grain mold. The absolute grain yield genetic gain from the base year 1990 is 44.93 kg/ha/yr over the first released variety CSV 15. The realized mean yield increased from 2658 kg/ha of the variety CSV 15 in 1990s to 4069 kg/ha of SPV 2579 developed in 2020s. The absolute genetic gain for grain mold resistance is -0.11 per year with an overall relative gain of 1.46% over CSV 15. The top varieties for grain yield (SPV 2579, SPV 2678 and SPV 2578), fodder yield (PYPS 2, SPV 2769 and SPV 2679), shoot fly tolerance (PYPS 8, PYPS 2 and SPV 2179), mold tolerance (PYPS 8, PYPS 2 and SPV 2579) and high protein (PYPS 8, PYPS 2 and SPV 2769) were identified for possible scale up and further use in breeding program diversification. The study revealed that sorghum varieties bred with diverse genetic backgrounds such as landraces and with tolerance to pests and diseases had stable yield performance. Application of genomics and other precision tools can double genetic gains for these traits to strengthen sorghum cultivation in rainfed areas serving food and nutrition security.

Effect of Drought Stress on Morpho Phenological and Yield Parameters in Sorghum Genotypes

“…Morpho-phenological traits, such as plant height, flowering time, and leaf structure, play a vital role in a plant's ability to withstand and adapt to water scarcity. Yield parameters, including grain yield and water use efficiency, are critical for determining a crop's productivity under challenging environmental conditions [3]. By examining how various sorghum genotypes cope with drought stress, this study aims to unravel the genetic and physiological mechanisms underlying their adaptability [4].…”

Seed Germination and Early Seedling Growth of Sorghum (<i>Sorghum bicolor</i> L. Moench) Genotypes Under Salinity Stress

“…Presently, sorghum is one of the major food cereal crops, which ranks fifth after rice, wheat, maize, and barley in terms of importance and production. It constitutes the main food grain for over 750 million people who live in the semi-arid tropics of Africa, Asia, and Latin America [2]. More than 70% of the world's total production of sorghum comes from developing countries in Asia and Africa, where the crop is the mainstay of resources and technology-poor farmers, and is grown with limited inputs of water and nutrients.…”

Optimizing rabi crop diversification strategies for sustainable agriculture: A case study from Adilabad, Telangana

“…During the Rabi season (October-November to March-April), it serves as a vital crop for arid areas due to its drought tolerance. Sorghum grain is predominantly utilized for human consumption, fodder, feed, and fuel, while its seeds are used in popcorn and various culinary dishes (Saikat et al, 2012; Nagesh Kumar et al, 2022;Poshadri et al, 2023) [17,9,13] . Expanding sorghum cultivation to moisture-deficient zones could bolster food security, given its resilience and high yield potential under rainfed conditions, requiring minimal inputs.…”