PHOTOPERIODIC INDUCTION 0F FLOWERING IN SUGARCANE | ||||
| Journal of Plant Production | ||||
| Article 6, Volume 31, Issue 9, September 2006, Page 5575-5586 PDF (172.66 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2006.236150 | ||||
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| Authors | ||||
| H. H. El-Hlnnawy.1; E. A. Mahmoud1; B. D. Mohamed2; E. M. Mehareb2 | ||||
| 1Agronomy Department. Faculty of Agric..Cairo Univ..Giza.Egypt. | ||||
| 2Sugar Crops Res. Inst. Agric. Res. Center.Giza.Egypt | ||||
| Abstract | ||||
| Twenty-two sugarcane genotypes were subjected to either 30 or 50 photo- inductive days at a constant 12.5 hrs daylength then followed by decreasing daylength at a rate of 30 secay until reach to 11.5 hrs daylength to investigate their flowering performance. Results of individual and combined analysis of variance over two inductive cycles revealed significant differences among genotypes for duration of pre-flag leaf stage. duration of flag leaf stage. duration of emergence stage. minimum days to flower. maximum days to flower. duration of flowering period and percent of total flowered plants.The difference between inductive cycles was significant for all characters except for duration of panicle emergence and duration of flowering period.The genotypes I inductive cycles interactions were significant for all studied characters. The twenty-two sugarcane genotypes under study were classified into four groups. The first included ten genotypes; NCO 310. G 99-165. F146. F161. CP57- 614. EH94-1B1-1. Ph 7115, UP34-3B. CP31-294 and 30 50. that responded to 30 and 60 inductive cycles. therefore the number of inductive cycles required to complete flower induction of these genotypes probably ranged between 30 and 60 inductive cycles.The second group consisted of two genotypes: EH 94-119-72 and R00 1. that flowered only under 30 inductive cycles therefore 30 inductive cycles was the optimum treatment for these two genotypes.The twelve genotypes that responded and reached to complete flowering under 30 day cycles. could be considered as easy to flower genotypes.The third group ‘mcluded five genotypes; BO 55. G 95-21.Crystallina. CP 67-412 and G 98-24 that flowered only under 60 inductive cycles which indicate that 60 inductive cycles could be considered the optimum treatment for these genotypes. The fourth group Included five genotypes; CP 44-101.CP 704517.00 301. GT 54-9 and G 53-33. that did not show any response neither under 30 nor under 60 inductive cycles which inclcates that these genotypes are shy to flower or need more inductive cycles to induce flowering. Therefore. the twenty tivo evaluated sugarcane genotypes varied considerably among themselves in their response to flowering under the used photoperiod inductive cycles. | ||||
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