TITLE Evaluation of seed health of some rice varieties under different conditions
AUTHOR M.Sh. Islam
Senior Scientific Officer, Agronomy Division, Bangladesh Rice Research Institute, Gazipur, Bangladesh
Q.S.A. Jahan
Scientific Officer, Plant Pathology Division, Bangladesh Rice Research Institute, Gazipur, Bangladesh
K. Bunnarith
Agronomist, Combodia-IRRI-Australia IPM project, Cambodia
S. Viangkum
Quarantine Officer, Laos-IRRI project, Laos
S.D. Merca
Assistant Scientist, Seed Health Unit, International Rice Research Institute, Los Banos, Philippines
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ABSTRACT An experiment was conducted at the International Rice Research Institute (IRRI) to evaluate the seed quality of some rice varieties under different treatment conditions. Significant variation in respect of germination (%) and pathogenic infection was observed in different varieties and treatments. Among the varieties, C-4/Malaqkit (V1) and IR59 (V2) had the higher % of germination in all treatments except chemical treatment (T2). In case of pathogen, Alternaria padwickii was dominant, and its incidence was the highest in best seed (T1) & Farmer's original seed (T3) for all varieties except R30 (V4). There was no pathogen in chemically treated seeds. For both in-soil and in-between paper germination test, V1 had the highest and V4 had the lowest percent of normal seedlings in all the treatments. The percent of abnormal seedlings of all varieties was statistically similar in in-soil test but dissimilar for in-between paper test. The percent of abnormal seedlings in between paper test and dead seeds for in-soil test were higher in case of V2 & V4. Variety V2 had the highest while V4 had the lowest vigor in all treatments. Among the treatments, the vigor and normal seedling were the highest in T1 irrespective of varieties. The highest lethal seed infection was caused by Fusarium moniliforme. Alternaria padwickii and Curvularia spp. also caused lethal seed infection.
KEYWORD Lethal seed infection; Rate of germination index; Seed health; Seed vigor;
ARTICLE INFO Botanical Bulletin of Academia Sinica, Volume 41 Number 4 October 2000, page 293-297, 5 pages
PUBLISHER Institute of Plant and Microbial Biology, Academia Sinica, Taipei, Taiwan, Republic of China