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Abstract
Rice is one of the most important staple crops consumed by a large part of the human population but the issue of salinity is one of the limiting factors affecting its productivity. The objective of this study was to identify salt tolerant genotype for deployment into salt stressed regions and also for population improvement for salinity breeding programme. Material and Methods: the study was a potted experiment using 8 korean lines and UPIA1 and UPIA2 as check in a randomized complete block design with four levels of sodium chloride concentration (0, 2, 3 and 6 dS/m) replicated three times at the University of Port Harcourt Teaching and Research Farm. Result: most of the genotype showed differential response to salinity stress. Varieties like UPN 509, UPN 216, constantly showed high mean value for Leaf Area Index, 1000 grain weight, plant height and tillering ability across the salinity concentration gradient in salinity tolerance index. Principle Component 1 and 2 contributed 46.17% and 15.17% respectively of the total variation. Total grain yield showed strong positive significant correlation with plant height, grain weight per panicle leaf area index and 1000 grain weight. In conclusion, UPN 509 which showed the highest yielding capacity and UPN 216 which showed the highest tillering ability and tolerance to salinity stress at the highest concentration level maybe promising genotypes for deployment into saline stressed environment.
Highlights
Rice (Oryza sativa) (Asian rice) and Oryza glaberrima (African rice) are two dominants and most cultivated among the oryza species
Leaf Area Index for genotypes used for the experiment ranged from 0.3-1.7 with UPN177 having the highest leaf area index and UPIA2 having the lowest leaf area index
Salinity stress affects the productivity of rice in saline environment
Summary
Rice (Oryza sativa) (Asian rice) and Oryza glaberrima (African rice) are two dominants and most cultivated among the oryza species. Rice is a staple crop and becoming as income generation for rice farmers all over the world and is one of the most important cereal and widely consumed as staple food for a large world population. As the world population is on the increase, leading to high demand in rice consumption all over the world. This become a challenge for sustainability and sufficient rice production to meet the consumption rate [1] One of the most assured ways of sustainability is to breed durable and resilient rice varieties with high yield and good agronomic traits preferred by rice stakeholders. Salinity (excess amount of soluble salts in the soil solution) is a major stress limiting the production of food crops. Salinity induces water deficit even in well-watered soils by decreasing the osmotic potential of soil solutes making it difficult for roots to extract water from their surrounding media [4]
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