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| 001 | u159232 | ||
| 003 | SIRSI | ||
| 008 | 100310s2008 ua ss b 0 eng d | ||
| 040 | _aEAL | ||
| 041 |
_aeng _bara |
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| 090 | _aART AJARX V53 No1 12 | ||
| 100 | 1 | _aShetta, N.D. | |
| 240 | 1 | 0 |
_aAlexandria journal of agricultural research, 2008 v. 53 (1) _h[electronic resource]. |
| 245 | 1 | 0 |
_aTest the resistance to ultraviolet irradiation and low vacuum pressure on germination of some woody tree seeds _h[electronic resource]. |
| 246 | 1 | 5 | _aاختبار مدى مقاومة بعض بذور الاشجار الخشبية للتعرض للأشعة الفوق بنفسجية والضغط المنخفض تحت تفريغ. |
| 300 | _ap. 95-103 | ||
| 504 | _aIncludes reference. | ||
| 520 | _aThis study was carried Out in Laboratory of Rhizosphére biology in INRA- Versailles. France. from April 2005 to January 2006 in two experiments repeated under the same laboralory conditions. The objeclive of the study was to test the resistance of some woody tree seeds to condition found in space (Ultraviolet -C and low vacuum pressure). Seeds of four tree species. Acacia saligna. Leucaenia leucocephylla. as the hard coat seeds and Casuarina cunninghamiana and Eucalyptus cammaldulensis as the light coat seeds, were exposed to Ultraviolet ( λ= 254 nm.) and low vacuum pressure (1. 33x 10̄̄⁻¹ Pa) to study the efficts on seeds germination. The results indicated that, both the Ultraviolet and low vacuum pressure affected seed germination. Leucaenia leucoeephylla seeds were the most toterant to exposure to the Ultraviolet 254 nm irradiation. while the low sensitive ones were Acacia saligna and Casuarina cunninghamiana seeds. The lowest exposure period did not affect germination of the tree seeds hardly was 6 hours, while the most effective exposure period was 24 hours. | ||
| 546 | _aSummary in Arabic. | ||
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_aPlants _xEffect of ultraviolet radiation on. |
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_aSeeds _xIrradiation. |
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_aSeeds _xGrowth. |
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| 650 | 0 | _aTrees. | |
| 650 | 0 | _aElectromagnetic waves--Environmental aspects. | |
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_tAlexandria journal of agricultural research. _g 2008 v. 53 (1) _x 0044-7250 _7nnas _wu15848 |
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| 856 | 4 | 0 |
_uhttp://nile.enal.sci.eg/EALE/2008/AJARX/5308/1/95.pdf _zFull Text Article. |
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