Genetic analysis of tolerance to transient waterlogging stress in pigeonpea (Cajanus cajan L. Millspaugh)

Basavaraj, P S and Rane, J and Boraiah, K M and Gangashetty, P I and Harisha, C B (2023) Genetic analysis of tolerance to transient waterlogging stress in pigeonpea (Cajanus cajan L. Millspaugh). Indian Journal of Genetics and Plant Breeding, 83 (3). pp. 316-325. ISSN 0975-6906

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Abstract

Pigeonpea (Cajanus cajan L. Millspaugh) is mainly grown in the rainfed ecosystem during the monsoon season on deep vertisols, and it often faces transient waterlogging problems due to continuous and heavy downpours during early monsoon seasons. Thus, waterlogging has become a significant issue in most of the pigeonpea growing areas of the semi-arid tropics due to heavy rain during the initial crop growth stage, which causes 30 to 40% economic yield loss in India and around the world. Only a few sources of waterlogging tolerant genotypes are available in pigeonpea but are not in the required duration. Hence, the present investigation was carried out to identify waterlogging tolerant pigeonpea genotypes in different durations suitable for different agroecologies of India and to find ideal selection indices as appropriate strategies to identify waterlogging tolerant genotypes. In this study, 162 genotypes were screened under in vitro conditions for 2, 4, 6, and 8 days by submerging seeds. Of these, 33 genotypes could survive for eight days. Further, following a standard screening protocol; these 33 pigeonpea genotypes were screened under pot culture for two years (2020 and 2021). Based on different morpho-physiological parameters and waterlogging tolerant coefficient, genotypes ICP-10397, ICP-7507, ICP-7869, ICP-7148, ICP-4903 ICP-16309, ICP-7375, ICP-6815, ICP-7507, and ICP-6128 were identified as tolerant to transient waterlogging. In addition, this study reports the existence of substantial genetic variation for waterlogging tolerant traits in pigeonpea. Stress indices, such as stress tolerance index) (STI), mean relative performance (MRP) and relative efficiency index (REI) were identified as the ideal selection index. Therefore, identified genotypes are further validated and can be deployed in waterlogging tolerance pigeonpea breeding programs.

Item Type:	Article
Divisions:	Global Research Program - Accelerated Crop Improvement
CRP:	UNSPECIFIED
Uncontrolled Keywords:	Waterlogging, pulse, flood, pigeonpea, abiotic stresses
Subjects:	Others > Abiotic Stress Others > Floods Mandate crops > Pigeonpea
Depositing User:	Mr Nagaraju T
Date Deposited:	22 Feb 2024 07:51
Last Modified:	22 Feb 2024 07:51
URI:	http://oar.icrisat.org/id/eprint/12503
Official URL:	https://www.isgpb.org/journal/index.php/IJGPB/arti...
Projects:	UNSPECIFIED
Funders:	UNSPECIFIED
Acknowledgement:	The authors thank ICRISAT, Hyderabad, for sharing seeds and ICAR-NIASM for supporting this study. Authors acknowledge the ICAR-NICRA for funding this research.
Links:	Google Scholar

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