@article { author = {Arumugam, M. and Rajanna, M. P. and Gowda, R.}, title = {Seed dormancy and seedling vigour as influenced by planting time environment and date of harvest in rice (Oryza sativa L.)}, journal = {Caspian Journal of Environmental Sciences}, volume = {6}, number = {1}, pages = {1-9}, year = {2008}, publisher = {University of Guilan}, issn = {1735-3033}, eissn = {1735-3866}, doi = {}, abstract = {Seed dormancy is a genetically inherited trait whose intensity is modified by the environment during seed development and maturation. In order to study the effect of harvest time on the seed quality and optimum time of sowing to obtain good quality seeds, freshly threshed seeds of ten diverse rice genotypes harvested from six environments were evaluated for seed dormancy and seedling vigour index as a measure of seed quality. There were significant differences in germination in different genotypes in all the six environments as well as days after harvest. The germination percentage was initially low and gradually increased with increasing in days after harvest (0. 15, 30 and 45th day after harvest). Out of these six genotypes viz., IET 8116, KMP 101, IR 30864, KRH-1, IR-64 and MTU 1001 were found dormant, immediately after harvest. The studies indicated that sowing in the first (June 2nd fortnight) and second environment (July 1st fortnight) were resulted in production of non-dormant seeds. Whereas all the six environments were favorable to take up seed production of new promising rice genotype KMP 101.   REFERENCES Abdul Baki, A.A and Anderson, J.D. (1973) Vigour determination in soybean seeds by multiple criteria. Crop Sci. 13, 630-633. Agarwal, P.K. (1981) Genotyic variation in seed dormancy of paddy and simple methods to break it. Seed Res. 9(1), 20-27. Allard, R.W. and Bradshaw, A.D. (1964) Implication of genotype- environment interaction in applied plant breeding. Crop Sci. 4, 503-507. Angrish, R. and Panwar, D.V.S. (1995) Seed dormancy and viability in some rice genotypes. Seed Res. 23(2), 118-120. Arumugam, M. (2002) Stability of rice genotypes over extended dates of sowing during wet season under cauvery command area in Karnataka. MSc. (Agri.) Dissertation submitted to University of Agricultural Sciences, Bangalore, India. Biradar, B.B. and Mahadevappa, M. (1993) Dormancy and germination studies in CTH 1 a cold tolerant rice. Seed special. 10, 494-497. CRRI, (1996) Central Rice Research Institute, Souvenir of 1996. CRRI, Cuttack, India. pp. 18-25. Hindu, (2002) The Hindu Survey of Indian Agriculture. pp.5-7. Hussaini, S.H. Ahmed, J. and Dhanraj, A. (1988) Effect of accelerated ageing in germination Vigour and yield of maize. Seed Res. 16, 68-74. ISTA, (1996) International rules for seed testing. Seed and Technol. 24, 335-342. Karuna, M.N and Aswathaiah, B. (1989) Effect of seed Vigour on field performance in beetroot and carrot. Seeds and Farm. 15, 40-47. Naylor, J.M. (1983) Studies on the genetic control of some physiological processes in seeds. Canadian Journal of Botany. 61, 3561- 3567. UAS (2000) Package of Practices for higher yields, University of Agricultural Sciences, Bangalore, India, pp. 17-43. Padma, V. and Murali mohan reddy, B. (2000) Evaluation of rice genotypes for Arumugam et al. 9 dormancy duration and seed storability under natural and accelerated ageing. Seed Res. 28, 158-165. Padmaja R. (1994) Studies on seed dormancy in traditional rice varieties as affected by seasons. Indian J. Plant Physiol. 37(2), 113 - 115. Rame, G., Swarnna, C., Devaraju, P.J. and Vidya Chandra, B. (2003) Dissipation of seed Dormancy and its breaking methods I KRH-2 hybrid rice and its parental lines. Seed research. 31, 102-104. Singh, A.R. and Borikar, S.T. (1985) seed quality and storability as influenced by time of harvesting in sorghum. J. Mahastra Agri. Univ. 10, 167-169. Sukumara Dev, V.P. (1982) Post harvest dormancy of important high yielding paddy varieties cultivated in Kerala. Seed Res. 11, 167-171.}, keywords = {Environment,Seed Dormancy,Seedling vigour,Sowing Date,rice}, url = {https://cjes.guilan.ac.ir/article_1002.html}, eprint = {https://cjes.guilan.ac.ir/article_1002_f23e7dd5f81cdd55e5ebfbceeacfa76d.pdf} }