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Abstract The present study was carried out 011 ()pIJllIJU Fir.:lls-indicll and Agave sisalana (Both arc xcrophyts) to get some clue information about the following objecti yes: A) Improving the seedling emergence of O. Ficus indica by controlling its seed dormancy by using specific growth regulators, growth co-factors,. moisture-cold stratification, scarification by concentrated H2S04, and seed subjection under thermal alternation. B) Growth behaviour of cladode, flowering, and fruit development of O. Ficus indica. e) Effect of some growth regulators on fruit growth and development of O. Ficus indica. D) Effect of different NxK rates on specific available mineral accumlations and nitrate reductase activity of Agal’c sisal ana Perine, seedlings. To approach the aim of this investigation. series of studies were carried out during the periods extended from 1992 till 1994, improving the seedlings emergence of O. Ficus indica experiments were carried out under the green house of Desert R,esearch Center, Cairo. Also. the experiment of Agave sisalana nutrients uptake was carried out on the same Center, while other experiments on the \ growth pattern of cladodes or fruits were carried out in many locations. The following results may be summarized as follows: A) Improving the seedling emergence of O. Ficus indica. 1- The highest germination percentage and index were gained when seeds of O. FICUS indica soaked in mixture of L ppm, NAA + 2 ppm BA + 5 ppm GAJ 2- All treatments with growth co-factors increased significantly the net gain of O. Ficus indica seedling emergence. 3- The highest stimulatory effect on seedling emergence was gained by: a) The application of 1 ppm AA alone or by GA3 + SA (5+ I ppm) without AA. . b) When seeds were exposed to moist-cold stratification for nine days only. this stimulatory effect decreased with increasing the time of stratification. c) Externally supplement by I ppm AA + 1 ppm colchicin + hydrolytic enzymes. d) When seeds were soaked in KN03 solution containing 30 ppm followed by 5 ppm IAA. B) Growth behaviour of cladode, flowering. and fruit development of O. Ficus-indica. 1- The juvenile cladode reached fan expansion after 33 days, also, length and width reach the maximum after 3 1 days from the beginning’ of bud stage. 2- The best growth and higher cladode formation was gained under Maryut conditions than under Ras Sudr. 3- The plant gave two waves of flowering and fruiting under Maryut conditions, while under Matariya conditions it gave only one wave of flowering and fruiting. 4- The fruit development of O. Ficus indica look about 104 days from the instillation of flowering but . till full narvcstabte maturity. C) Effect of some growth regulators on fruit growth and development of O. Ficus-indica: 1- Painting GA.~ or NAA affected slightly fruit growth parameters of O. Ficus-indica. 2- Injection of GA3 or NAA and 8A affected on fruit growth parameters of O. Ficus-indica were gave the following results: a) The highest stimulatory effect on fruit length and fruit fresh weight was gained when used 50 ppm GA3 in the presence of 25 ppm 8A and 0.0 ppm NAA. b). The highest proportion of fleshy edible portion was obtained by using 50 ppm GA3 + 100 ppm NAA + 0.0 ppm SA. c) The formation of mature seeds per one fruit decreased significantly under 100 ppm GA3 and 100 ppm NAA. This decrement increased with increasing their used rate, while, SA stimulated the seeds formntion. d) There are negative correlation between seed number and 100 seed weight. e) The high concentration (accumulation) of ascorbic acid and fruit pigments were gained when plants treated with highest concentrations of NAA and GA3 when applied alone or when they used the three substances as combined treatment. D) Effect of different NxK rates onspecific available mineral accumulations and nitrate reductase activity of Agave sisalana Prine, seedlings: 1- The dominant form of available inorganic nitrogen in both tested seedling part was always the nitrate-No 2- K play apart in the accumulation of nitrate-ammonia-N. 3- K concentration mostly decreased with increasing N level. 4- The main dominant available cation in A. sisalana seedling was N a followed by K. 1\1g. Fe, 7.11 and Mu 5- N application minimized the available Mg cocncntration whi lc the moderate of K stimulated slightly. 6- The moderate N or K stimulated the accumulation of available Fe. |