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IMPACTS OF DELAYED FIELD CURING ON RICE SEED QUALITY IN A TROPICAL ENVIRONMENT
Published online by Cambridge University Press: 05 April 2018
Summary
Three upland rice species, viz. Oryza sativa, Oryza glaberrima and an O. sativa × O. glaberrima interspecific hybrid, were grown in Ghana, harvested, and field cured under open (wet) and within ventilated but rainproof containers (dry) conditions for 5 weeks. Seeds from both environments were assessed weekly for physical, physiological and pathological quality. The relationships between air temperature and relative humidity, and seed moisture content (MC) and water activity differed between curing environments but within curing environments, relationships between seed MC and water activity were comparable among species. Prolonged field curing resulted in structural damage evidenced by the formation of multiple cracks in the endosperm; these were more frequent in wet cured seeds. Diverse fungal species were isolated from wet (22 species) and dry (23 species) cured seeds with a number of soil-borne species in the wet environment. Curing environment did not influence levels of fungal infection in O. glaberrima seeds but dry curing was associated with higher levels of fungal infection in O. sativa and O. sativa × O. glaberrima. Seed germinability in all the three species was higher in the dry cured seeds although vigour was relatively lower than wet cured seeds. Field curing the seeds of these three species within a dry environment could potentially improve subsequent seed viability, aid in moisture management and minimize structural damage to the endosperm; however, research on how fungal infection could be curbed under such conditions is needed.
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- Copyright © Cambridge University Press 2018
References
REFERENCES
Bam, R. K., Craufurd, P. Q., Dorward, P. T., Asiedu, E. A., Kumaga, F. K. and Ofori, K. (2007). Introducing improved cultivars: Understanding farmers’ drying and storage practices in Central Ghana. Experimental Agriculture 43:301–317.Google Scholar
Bonner, F. T., Vozzo, J. A., Elam, W. W. and Land, S. B. (1994). Tree seed technology training course. Instructors manual. General Technical Report SO-106. New Orleans, L.A.: US Department of Agriculture, Forest Service, Southern Forest Experiment Station, p. 160.Google Scholar
Ellis, R. H., Hong, T. D. and Roberts, E. H. (1983). Procedures for removal of dormancy from rice seed. Seed Science and Technology 11:77–112.Google Scholar
Fisher, P. J. and Petrini, O. (1992). Fungal saprobes and pathogens as endophytes of rice (Oryza sativa L.). New Phytologist 120:137–143.Google Scholar
Groot, S. P. C., Surki, A. A., de Vos, R. C. H. and Kodde, J. (2012). Seed storage at elevated partial pressure of oxygen, a fast method for analysing seed ageing under dry conditions. Annals of Botany 110:1149–1159.Google Scholar
Harris, D., Pathan, A. K., Gothkar, P., Joshi, A., Chivasa, W. and Nyamudeza, P. (2001). On-farm seed priming: Using participatory methods to revive and refine a key technology. Agricultural Systems 69:151–164.Google Scholar
Hay, F. R., de Guzman, F., Ellis, D., Makahiya, H., Borromeo, T. and Hamilton, N. R. S. (2013). Viability of Oryza sativa L. seeds stored under genebank conditions for up to 30 years. Genetic Resource and Crop Evolution 60:275–296.Google Scholar
Hay, F. R. and Timple, S. (2016). The longevity of desorbing and adsorbing rice seeds. Seed Science Research 26:306–316. doi:10.1017/S0960258516000222Google Scholar
Hogan, J. T. and Karon, M. L. (1955). Hygroscopic equilibria of rough rice at elevated temperatures. Journal of Agricultural and Food Chemistry 3:855–860.Google Scholar
International Seed Testing Association (ISTA). (2005). International rules for seed testing. Edition 2005. Switzerland, The International Seed Testing Association.Google Scholar
ISTA (2001). International rules for seed testing. Rules Amendments. Seed Science and Technology 29:1–127.Google Scholar
Kunze, O. R. (2008). Effect of drying on grain quality: Moisture re-adsorption causes fissured grains. Agricultural Engineering International: the CIGR Ejournal Invited Overview X (1): 17.Google Scholar
Kunze, O. R. and Choudhury, M. S. U. (1972). Moisture adsorption related to tensile strength of rice. Cereal Chemistry 49:684–696.Google Scholar
Marthur, S. B. and Kongsdal, O. (2003). Common Laboratory Seed Health Testing Methods for Detecting Fungi, 2nd edn. Switzerland: International Seed Testing Association.Google Scholar
Mousa, W., Ghazali, F. M., Jinap, S., Ghazali, H. M. and Radu, S. (2011). Modelling the effect of water activity and temperature on growth rate and aflatoxin production by two isolates of Aspergillus flavus on paddy. Journal of Applied Microbiology 111:1262–1274.Google Scholar
Nagata, K., Sasaki, R. and Ohdaira, Y. (2013). Cultivar differences in the grain cracking of rice under the high air temperature conditions during grain filling. Japanese Journal of Crop Science 82:42–48.Google Scholar
Nghiep, H. V. and Gaur, A. (2004). Role of Bipolaris Oryzae in producing abnormal seedlings of rice (Oryza sativa). Omonrice 12:102–108.Google Scholar
Notteghem, J. L., Roux-Cuvelier, M., André, F. and Roumen, E. (1997). Rice diseases in the Carmargue, France. In Maladies Du riz En Region Médditerranéenne et les Possibilités D'amélioration de sa Résistance, 15, 41–44 (Eds Chataigner, J.). Montepellier: Cashiers Options Méditerranéennes.Google Scholar
Nyaaba, S. A. (2015). Effects of storage material on the seed quality characteristics of four rice varieties in Ghana. M. Phil. dissertation. Kwame Nkrumah University of Science and Technology, Ghana. Unpublished. 75 pp.Google Scholar
Ou, S. H. (1985). Rice Diseases, 2nd ed. Kew, England: Commonwealth Agricultural Bureaux, Commonwealth Mycological Institute.Google Scholar
Rao, N. K. and Jackson, M. T. (1996). Seed longevity of rice cultivars and strategies for their conservation in genebanks. Annals of Botany 77:251–260.Google Scholar
Raviv, B., Aghajanyan, L., Granot, G., Maover, V., Frenkel, O., Gutterman, Y. and Grafi, G. (2017). The dead seed coat functions as a long-term storage for active hydrolytic enzymes. PLoS One 12 (7):e0181102.Google Scholar
Rossi, V., Scandolara, A. and Battilani, P. (2009). Effect of environmental conditions on spore production by Fusarium verticillioides, the causal agent of maize ear rot. European Journal of Pathology 123:159–169.Google Scholar
TeKrony, D. M., Egli, D. B. and Phillips, A. D. (1979). Effect of field weathering on viability and vigour of soybean seed. Agronomy Journal 72:749–753.Google Scholar
Topani, V. A., Rachana, M. R., Navi, S. S., Thakur, P. P., Bandyopadhyay, R., Varanavasiappan, S. and Seetharama, N. (2007). Effect of temperature and relative humidity regimes on grain mold sporulation and seed quality in sorghum (Sorghum bicolor (L.) Moench.). Archives of Phytopathology and Plant Protection 40:113–127.Google Scholar
Vertucci, C. W. and Leopold, A. C. (1987). Water binding in legume seeds. Plant Physiology 85:224–231.Google Scholar
Bam et al. supplementary material
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