Bot Light And Uv Radiation

‫١‬

‫ﺟﺎﻣﻌﺔ اﻟﻤﻠﻚ ﺳﻌﻮد‬ ‫ﻗﺴﻢ اﻟﻨﺒﺎت واﻷﺣﻴﺎء اﻟﺪﻗﻴﻘﺔ‬
‫ﻓﺴﻴﻮﻟﻮﺟﻴﺎ اﻹﺟﻬﺎدات اﻟﻤﺘﻘﺪم ١٧٦ ﻧﺒﺖ ) ٢ + ٠(‬

‫اﻷﺷﻌﺔ ﻓﻮق اﻟﺒﻨﻔﺴﺠﻴﺔ‬
‫‪Handout UV radiation‬‬
‫ﻃﺒﻘﺎ ﻟﻤﺼﺎدر ﻋﺪﻳﺪة )‪ (NASA, FDA, andothers‬ﻳﻤﻜﻦ ﺗﻘﺴﻴﻢ اﻷﺷﻌﺔ ﻓﻮق اﻟﺒﻨﻔﺴﺠﻴﺔ ﺣﺴﺐ اﻟﻄﻮل اﻟﻤﻮﺟﻲ آﺎﻟﺘﺎﻟﻲ :‬ ‫‪400 nm - 320 nm‬‬ ‫‪UV-A‬‬ ‫‪320 nm - 290 nm‬‬ ‫‪UV-B‬‬ ‫‪290 nm - 100 nm‬‬ ‫‪UV-C‬‬‫‪http://www.physlink.com/Education/askExperts/ae300.cfm‬‬ ‫اﻟﻄﻴﻒ اﻟﻜﻬﺮوﻡﻐﻨﺎﻃﻴﺴﻲ‬ ‫)ﻡﻘﻴﺎس ﻡﻮﺱﻊ ﻟﻄﻴﻒ اﻷﺷﻌﺔ ﻓﻮق اﻟﺒﻨﻔﺴﺠﻴﺔ(‬

‫اﻟﻄﻮل اﻟﻤﻮﺟﻲ‬ ‫ﻻﻣﺘﺼﺎص اﻷوزون‬

‫اﻟﻄﻮل اﻟﻤﻮﺟﻲ‬ ‫اﻟﻤﺒﻴﺪ ﻟﻠﺠﺮاﺛﻴﻢ‬

‫اﻟﻤﺼﺪر : ‪http://www.ezuvc.com/ezuvc-what_is.htm‬‬

‫ﺻﺒﻐﺎتاﻟﺘﺸﻜﻞ اﻟﻨﺒﺎﺕﻴﺔ‬
‫‪phytomorphogenesis pigments‬‬ ‫اﻟﻤﻘﺪﻣﺔ‬ ‫ﺗﺘﻤﻴﺰ اﻟﻨﺒﺎﺗﺎت اﻟﺨ ﻀﺮاء ﺏﻌﻤﻠﻴ ﺎت ﺗ ﺴﺘﺤﺜﻬﺎ اﻹﺽ ﺎءة وﺗ ﺪﻋﻰ اﻟﻌﻤﻠﻴ ﺎت اﻷﺣﻴﺎﺽ ﻮﺋﻴﺔ ‪ Photo biological processes‬ﺣﻴ ﺚ‬ ‫أﻥﻬﺎ اﻟﻤﺴﺆوﻟﺔ ﻋﻦ ﻥﻤﻮاﻟﻨﺒﺎت وﺗﺸﻜﻠﻪ ﻓﻲ وﺝﻮد اﻹﺽ ﺎءة وه ﻮ ﻡ ﺎ یﻌ ﺮف ﺏﺎﻟﺘ ﺸﻜﻞ اﻟ ﻀﻮﺋﻲ ‪ . photomorphogenesis‬ﺗ ﺈن‬ ‫اﻟﻔﺮوق ﺏﻴﻦ اﻟﺘﺸﻜﻞ ﻓﻲ اﻟﻈﻼم واﻟﺘﺸﻜﻞ ﻓﻲ اﻹﺽﺎءة ﻥﺎﺗﺠﺔ ﻋ ﻦ ﺗﻐﻴ ﺮ ﻓ ﻲ ﺗﻌﺒﻴ ﺮ اﻟﻤﻮرﺙ ﺎت واﻟ ﺬي ﺗ ﺴﺘﺤﺜﻪ اﻹﺽ ﺎءة ‪(Ma et‬‬‫ُ‬ ‫)1002 ,.‪ al‬و )1002 ,.‪ (Tepperman et al‬و )2002 ,.‪. (Schroeder et al‬‬

‫٢‬ ‫ﺻﺒﻐﺎت اﻷﺣﻤﺮ/اﻷﺣﻤﺮ اﻟﺒﻌﻴﺪ )اﻟﻔﺎیﺘﻮآﺮوﻣﺎت(‬ ‫ﺗﻌ ﺪ اﻟﻔﺎیﺘﻮآﺮوﻡ ﺎت ﻡ ﻦ اﻟ ﺼﺒﻐﺎت اﻟﻤﺘﺄرﺝﺤ ﺔ ﺏ ﻴﻦ ﻟ ﻮﻥﻴﻦ ﺣ ﺴﺐ ﺁﺥ ﺮ إﺽ ﺎءةﺗﻌﺮﺽ ﺖ ﻟﻬ ﺎ اﻟ ﺼﺒﻐﺔ، ﻟ ﺬﻟﻚ هﻨ ﺎك‬ ‫ﺷﻜﻠﻴﻦ ﺙﺎﺏﺘﻴﻦ ﻟﻜﻞ ﻓﺎیﺘﻜﺮوم ؛ اﻟﺸﻜﻞ اﻟﺮﺋﻴﺴﻲ ویﺒﻨﻰ ﻓﻲ اﻟﺴﺘﻮﺏﻼزم ورﻡﺰﻩ )‪ (Pr‬ﺣﻴﺚ یﻤﺘﺺ اﻟﻀﻮء ذو اﻟﻄ ﻮل اﻟﻤ ﻮﺝﻲ ﻓ ﻲ‬ ‫ُ‬ ‫ﻡﻨﻄﻘ ﺔ اﻷﺣﻤ ﺮ )٠٥٦-٠٧٦ ﻥ ﺎﻥﻮﻡﺘﺮ( ﻟﻴﺘﺤ ﻮل إﻟ ﻰ اﻟ ﺸﻜﻞاﻟﺜ ﺎﻥﻲ ورﻡ ﺰﻩ )‪ (Pfr‬واﻟ ﺬي یﻤ ﺘﺺ اﻟ ﻀﻮء ﻗ ﺮب اﻷﺣﻤ ﺮ اﻟﺒﻌﻴ ﺪ‬ ‫)٥٠٧-٠٤٧ ﻥﺎﻥﻮﻡﺘﺮ( ﻟﻴﻌ ﻮد إﻟ ﻰ اﻟ ﺸﻜﻞ اﻷول )‪] (Pr‬اﻥﻈ ﺮ اﻟﻤﺨﻄ ﻂ ﻓ ﻲ اﻟ ﺸﻜﻞ رﻗ ﻢ )٣-١([ . إن اﻟ ﺸﻜﻞ اﻟﻔﻌ ﺎل ﻓ ﺴﻴﻮﻟﻮﺝﻴﺎ‬ ‫ً‬ ‫واﻟﺬي یﺴﺘﺤﺚاﻹﺱﺘﺠﺎﺏﺔ )ﺗﻨﺸﻴﻂ أو ﺗﺜﺒﻴﻂ( هﻮ اﻟﺸﻜﻞ اﻟﺜﺎﻥﻲ )‪.(Pfr‬‬ ‫اﻟﻀﻮء اﻷﺣﻤﺮ‬
‫‪Red light‬‬ ‫‪Pr‬‬ ‫٦٦٦‪nm‬‬ ‫‪Pfr‬‬ ‫٠٣٧‪nm‬‬ ‫‪Far red light‬‬

‫اﻟﻀﻮء اﻷﺣﻤﺮ اﻟﺒﻌﻴﺪ‬ ‫اﻟﻀﻮء اﻷﺣﻤﺮ‬
‫‪Red light‬‬

‫ﺏﻨﺎء ‪synthesis‬‬‫‪Pr‬‬ ‫‪Far red light‬‬

‫‪Pfr‬‬

‫اﺱﺘﺠﺎﺏﺎت ﻓﺴﻴﻮﻟﻮﺝﻴﺔ‬
‫‪numerous responses‬‬

‫اﻟﻀﻮء اﻷﺣﻤﺮ اﻟﺒﻌﻴﺪ‬ ‫ﺗﻔﺎﻋﻼت اﻟﻈﻼم اﻟﻌﻜﺴﻴﺔ‬
‫‪Dark reversion‬‬ ‫هﺪم...