Effect of Gibberellic Acid on Morphological and Floral Traits, Outcrossing, Seed Yield and Quality in Parental Lines of Hybrid Rice and Efficacy of Ultra Low Volume Sprayer in Economisation of Dose of Gibberellic Acid
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Authors
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SUDIPTA BASU
Department Of Genetics and Plant Breeding, College of Agriculture, Acharya N.G.Ranga Agricultural University, Rajendra Nagar, Hyderabad-500030
Author
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H.A.KHAN
Department Of Genetics and Plant Breeding, College of Agriculture, Acharya N.G.Ranga Agricultural University, Rajendra Nagar, Hyderabad-500030
Author
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ILYAS AHMED
Department Of Genetics and Plant Breeding, College of Agriculture, Acharya N.G.Ranga Agricultural University, Rajendra Nagar, Hyderabad-500030
Author
Keywords:
Hybrid rice, parental lines, gibberellic acid, morphological and floral traits, outcrossing percentage, seed yield, seed quality, sprayerAbstract
An investigation was undertaken with two CMS lines, IR58025A and IR62829A with their respective maintainers in split plot design to determine the optimum dose and stage of application of gibberellic acid (GA) in parental line seed multiplication plot of hybrid rice. In addition, effect of GA, on morphological and floral traits, outcrossing percentage, seed yield and quality with efficacy of ultra low volume (ULV) sprayer in economisation of dose of above chemical was also evaluated. Spraying was done @30, 60, 90, 120 and 150g/ha with knapsack sprayer (KS) and @ 30, 45, 60 and 75g/ha with ULV sprayer at late boot leaf, five per cent panicle exsertion and flowering stage. Results of the study indicated that application of GA, @ 120 and 150g/ha with KS and @ 60 and 75g/ha with ULV sprayer were superior and spraying at five per cent panicle exsertion and flowering gave better results than application at late boot leaf stage. There was significant enhancement in plant height, panicle exsertion, floral traits i.e. duration and angle of spikelet opening, stigma exsertion, outcrossing percentage and seed yield with increment of GA, dose but had no effect on 100 seed weight and seed quality. The correlation studies indicated that the angle and duration of spikelet opening and outcrossing percentage were the main factors in enhancing the seed yield. The results showed that the yield realized per rupee investment on GA, reduced at higher doses. The study highlighted the efficacy of ULV sprayer in economisation of the dose. Although, GA, has established its inevitability in hybrid rice seed production but the study emphasized the need of its judicious and timely application at optimum dose for economizing the seed production.
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References
1. OKA, 11.1. & H. MORISHMA (1967). Variations in the breeding systems of a wild rice Oryza perennis. Evolution, 21: 249-258.
2. DUAN, X. M. & 11.S. MA. (1992). Effects of gibberellic acid application on seed yield and quality of hybrid rice. Seed Sci. & Technol., 20: 209-214.
3. KALAVATHI, D., A. ANANTHAKALAISELVI & J. VIJAYA. (2000). Economization of GA, use in hybrid rice seed production by supplementing with other nutrients. Seed Res., 28 (1): 10-12.
4. SIDDIQ, E.A., P.J. JACHUCK, M. MAHADEVAPPA, F.U. ZAMAN, VIJAYA KUMAR, B. VIDYACHANDRA, G.S. SIDHU, 1. KUMAR, M.N. PRASAD, M. RANGASWAMY, M.P. PANDEY, D.V.S. PANWAR & ILYAS AHMED. (1994). Hybrid rice research in India. In Hybrid Rice Technology: new developments and future. (Ed). S.S. Virmani. International Rice Research Institute, Manila, Philippines. pp 157-171.
5. PANDEY, S., S.P.SHARMA AND M. DADLANI. (2003). Effect of gibberellic acid application on floral and morphological traits, seed yield and storability of parental lines in hybrid rice(Oryza sativa). Indian J. of Agric. Sci. 73(7):376-380.
6. JAGADEESHWARI, P., S. SUDHEER KUMAR, M. GANESH & G. ANURADHA. (1998). Effect of foliar application of gibberellic acid on seed yield and quality in hybrid rice. Oryza, 35 (1): 26-30.
7. JAGADEESHWARI, P., S.P.SHARMA AND M.DADLANI. (2004). Effect of different chemicals on traits favouring outcrossing and optimization of GA, for seed production of cytoplasmic male sterile line in hybrid rice. Seed Sci. & Technol. 32:473-483.
8. ANONYMOUS. (1994). Annual Report, Directorate of Rice Research, Hyderabad. PP 35.
9. ISTA (1985). International Seed Testing Association. International Rules for Seed Testing. Seed Sci. & Technol. 13: 307-355.
10. KITTOCK, D.L. & A.G. LAW. (1968). Relationship of seedling vigour to respiration and tetrazolium chloride reduction by germinating wheat seeds. Agro. J. 60: 286-288.
11 YUAN, L.P. (1992). Hybrid seed production and MS line multiplication, In: National Rice Seed Production Training course. Directorate of Rice Research, Hyderabad, 7-12 October.
12. VIRMANI, S.S., G.S. KHUSH & R.C. YANG. (1980). Natural outcrossing on cytoplasmic male sterile lines of rice under tropical conditions. International Rice Research Newsletter, 5: 5-6.
13. NAMAI, H. & Η. ΚΑΤΟ. (1987). Number of pollen grains deposited upon a pistil assuring seed setting of male sterile seed parent in rice (Oryza sativa L.). Japan. J. Breed. 37 (1): 98-102.
14. NAMAI, H. & H. KATO. (1988). Improving pollination characteristic of Japonica rice. In Hybrid rice, International Rice Research Institute, Manila, Philippines. pp. 165-173.
15. ANONYMOUS (1988). Annual Report, International Rice Research Institute, Manila, Philippines. pp 18-28.
16. PARMAR, K.S., E.A. SIDDIQ & M.S. SWAMINATHAN. (1979). Variation in anther and stigma characteristics in Rice. Ind. J. Genetics, 39: 551-559.
17. SHARMA, H.L. (1991). Floral biology of rice in relation to outcrossing. In: National Hybrid Rice Seed Production Training Course. Directorate of Rice Research, Hyderabad, 7-12 October.
18. VIRMANI, S.S. (1994). Prospects of hybrid rice in the tropics and sub-tropics. In: Hybrid rice technology: new developments and future prospects, (Ed.) S.S. Virmani. International Rice Research Institute, Manila, Philippines, Pp 7-19.
19. PRABAGARANA, S.R. & A.S. Ponnuswamy. (1997). Determination of optimum growth stage for gibberellic acid application in hybrid rice seed production. Madras Agri. J., 84 (4): 231-232.
