Assessment of seed viability of rice (Oryza sativa L.) after 20- 30 years of storage at the genetic resources center at IRRI

Date

4-2011

Degree

Bachelor of Science in Agriculture

Major Course

Major in Agronomy

College

College of Agriculture and Food Science (CAFS)

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Abstract

The viability of Norin 12 (Accession 7520) and Luathom (Accession 7010) after 30, 25 and 21 years in the active and base collections of the Genetic Resources Center at the International Rice Research Institute was evaluated. The viability of Norin 12 seeds from active collection was lower compared to those from base collection. The seed survival curve of Norin 12 and Luathom followed the negative cumulative distribution. Luathom showed higher Ki in 30-year old and 25-year old seeds than 21 year-old seeds. Loss of viability was rapid in the 25-year old seeds compared with those from 30 and 21 years. Low Ki value and rapid viability loss was found in all seed lots of Norin 12. Youngest seeds (21 years old) had the fastest rate of viability loss (σ=1.2 days). High moisture content during the experimental storage was observed in the youngest seeds which caused its viability to fall rapidly. The research suggests that the initial quality and rate of viability loss in germplasm accessions are important in storage in the genebanks. Proper management and drying conditions during seed production and regeneration should be done.

Location

UPLB Main Library Special Collections Section (USCS)

Document Type

Thesis

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