Genotypic screening for salinity tolerance of rice genotypes from Eastern and Southern Africa at seedling stage

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  • Kefrine Kennedy Lutambi
  • Amelia Henry
  • Marjorie De Ocampo
  • Dmytro Chebotarov
  • Pedersen, Ole
  • Susan Nchimbi-Msolla
  • Newton L. Kilasi
Salinity significantly reduces global rice yield, especially in Eastern and Southern Africa, necessitating the development of salinity-tolerant varieties. We collected and analyzed 201 rice varieties, including Tanzanian landraces. Using 1k-RiCA SNP markers, we found that 36 out of 201 genotypes possessed the Saltol allele, a marker for salinity tolerance. Only two genotypes, K5 and Intsindagira bigega, were both phenotypically tolerant and had the Saltol allele. Interestingly, 16 genotypes without Saltol showed salinity tolerance, suggesting other salinity tolerance QTLs. The distribution of Saltol and phenotypically tolerant genotypes varied across Tanzanian agro-ecological zones, with the Coastal Zone showing a higher proportion of tolerant genotypes, possibly due to farmer selection pressure. However, ancestral population proportion correlated with decreased salinity tolerance. This study highlights the complex relationship between environmental factors and population structure in shaping the genetic and phenotypic composition of landraces. The identified tolerant genotypes could be utilized in breeding for new salinity-tolerant-rice varieties.
OriginalsprogEngelsk
Artikelnummer2349623
TidsskriftJournal of Plant Interactions
Vol/bind19
Udgave nummer1
Antal sider11
ISSN1742-9145
DOI
StatusUdgivet - 2024

Bibliografisk note

Funding Information:
This study was made possible by the funding provided for the Climate Smart African Rice Research Project by the Danish International Development Agency (DANIDA), to whom we express our gratitude. Our appreciation also goes to TARI, IRRI, and farmers for generously sharing their seed collection and Mawazo Shitindi, Newton Kilasi and Susan Nchimbi-Msolla for collecting the seeds from farmers. We are especially thankful to Juma Omary, Hussein Abdallah, and Witness Luoga from Sokoine University of Agriculture for their unwavering support during the phenotypic screening. Additionally, we would like to acknowledge James Egdane, Marinell Ramirez, Rochelle Zantua, Caesar Arloo Centeno, Cornelia Garcia and Steve Klassen from IRRI HQ for their invaluable assistance in screenhouse, laboratory work, data analysis and GIS work. We would like to give a special mention to Damien Platten and Maria Ymber Reveche for their guidance in genotyping. K. K. L. designed the study, conducted the screening work, collected data, and drafted the manuscript. K. K. L., M. O., and D. C. conducted the data analysis. A. H., M. O., D. C., O. P., S. N., and N. L. K. reviewed and edited the manuscript.

Funding Information:
This study was funded by DANIDA though Climate Smart African Rice Research Project with Grant agreement No 18-03-KU. This study was made possible by the funding provided for the Climate Smart African Rice Research Project by the Danish International Development Agency (DANIDA), to whom we express our gratitude. Our appreciation also goes to TARI, IRRI, and farmers for generously sharing their seed collection and Mawazo Shitindi, Newton Kilasi and Susan Nchimbi-Msolla for collecting the seeds from farmers. We are especially thankful to Juma Omary, Hussein Abdallah, and Witness Luoga from Sokoine University of Agriculture for their unwavering support during the phenotypic screening. Additionally, we would like to acknowledge James Egdane, Marinell Ramirez, Rochelle Zantua, Caesar Arloo Centeno, Cornelia Garcia and Steve Klassen from IRRI HQ for their invaluable assistance in screenhouse, laboratory work, data analysis and GIS work. We would like to give a special mention to Damien Platten and Maria Ymber Reveche for their guidance in genotyping. K. K. L. designed the study, conducted the screening work, collected data, and drafted the manuscript. K. K. L., M. O., and D. C. conducted the data analysis. A. H., M. O., D. C., O. P., S. N., and N. L. K. reviewed and edited the manuscript.

Publisher Copyright:
© 2024 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.

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