PRODUCTION OF VIGOROUS TRANSPLANTS IN Swietenia mahogani ( L. ) Jacq . BY USING GA3 | ||||
| Journal of Plant Production | ||||
| Article 16, Volume 28, Issue 1, January 2003, Page 343-354 PDF (3.38 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2003.241873 | ||||
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| Author | ||||
| Faten M. Reda | ||||
| Department of Forestry and Woody Trees , Horticulture Research Institute, Agricultural Research Centre, Giza, Egypt. | ||||
| Abstract | ||||
| The current investigation was carried out during the two successive seasons of 1998/1999 and 1999/2000 in order to enhancement seed germination and produce vigorous transplants inS panish mahogany by different methods of application with GA3. Therefore , seeds of Spanish mahogany were soaked in different concentrations of GAJ ( 0.0,50 , 100 ,200 and 400 ppm) or plants, three months old, were sprayed with 25 , 50 and 100 ppm GAJ. The percentage of seed germination , vegetative growth characters , photosynthetic pigments , total sugars , endogenous phytohormones and stem anatomy of Swietenia mahogani (L.) Jacq.as affected by GAJ treatments were 'investigated . The obtained results revealed that all seed soaking treatments increased the percentage of seed germination in both studied seasons and maximum significant increase was recorded at 400 ppm GAJ which in turn being statistically indifferent with that of 200 ppm GAJ . Also , it was found that different methods of GAJ application had, in general, beneficial effects on all studied characters of vegetative growth ( plant height, total leaf area/plant and fresh and dry weights of shoot 1 plant) . The maximum beneficial effect was 0 btained at foliar application with 50 ppm GAJ which induced vigorous growth in both studied seasons . It is realized that seed soaking treatments as well as foliar application treatments with GAJ increased chloroplast pigments, total sugars and endogenous 1M and GAJ in leaves of Spanish mahogany , 10 months old ,. Whereas , endogenous ABA was decreased in this respect. Worthy to note that among seed soaking treatments, 400 ppm GAJ was the promising concentration . While , among foliar application treatments , 50 ppm GAJ was the best concentration in this concern . Moreover , it was found that foliar application with 50 ppm GAJ caused considerable thickness of main stem by increasing the thickness of all included tissues. Thickness of periderm , cortex , phloem tissue and xylem tissue as well as pith diameter were increased in treated plants. | ||||
| Keywords | ||||
| GAJ; mahogany; vegetative growth; physiology; anatomy | ||||
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