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Abstract The role of Zinc in alleviating B-toxicity in terms of adventitious root formation (ARF) in cuttings of mung bean was studied. The toxic level of B in addition, to the promotory conc. of Znsalt was determined. Two of Zn-salts were tested (sulphate, and chloride), auxin was supplied as inductive treatment to enhance rooting response. 1. The toxic level of boron was 150 (µg/ml), this reduced growth parameters in terms of rooting response to 50% compared to control. 2. Zinc sulfate at conc. 1 (ppm) and Zinc chloride at 5 (ppm) developed the highest rooting response in mung bean cuttings. 3. For Boron detoxification, Zn-(sulphate and chloride) were supplied as pre-treatment, posttreatment or simultaneously with toxic-B. The best treatment for boron detoxification occurred completely by supplying Zinc sulphate and chloride prior to toxic-B treatment (pre-treatment), but after supplying auxin inductive treatment. 4. The protective role of Zinc-sulphate and chloride significantly enhanced the average of root number/cutting to its highest level in control treatment.

اﳋلاﺻة ﺇﻥ ﺩﻭﺭ ﺍﻟﺰﻧﻚ ﰲ ﲣﻔﻴﺾ ﺳﻤﻴﺔ ﺍﻟﺒﻮﺭﻭﻥ ﺑﺪﻻﻟﺔ ﺗﻜﻮﻳﻦ ﺍﳉﺬﻭﺭ ﺍﻟﻌﺮﺿﻴﺔ ﰲ ﻋﻘﻞ ﺍﳌﺎﺵ ﻗﺪ ﺩﺭﺱ ﺑﻌﺪ ﲢﺪﻳﺪ ﺍﻟﱰﻛﻴﺰ ﺍﻟﺴﺎﻡ ﻣﻦ ﺍﻟﺒﻮﺭﻭﻥ ﻭﺍﻟﱰﺍﻛﻴﺰ ﺍﳌﺤﻔﺰﺓ ﻟﻜﻞ ﻣﻦ ﻛﱪﻳﺘﺎﺕ ﻭﻛﻠﻮﺭﻳﺪ ﺍﻟﺰﻧﻚ ﺣﻴﺚ ﺟﻬﺰ ﺍﻻﻭﻛﺴﲔ ﻛﻤﻌﺎﻣﻠﺔ ﺍﺳﺘﺤﺜﺎﺛﻴﺔ ﻟﺘﺤﻔﻴﺰ ﺍﻟﺘﺠﺬﻳﺮ ﻭﻗﺪ ﺑﻴﻨﺖ ﺍﻟﻨﺘﺎﺋﺞ ﺍﻵﰐ: ( ﺣﻴﺚ ﺃﺧﺘﺰﻝ ﻣﺆﴍ ﺍﻟﻨﻤﻮﺍﳌﺘﻤﺜﻞ ﺑﻌﺪﺩ ﺍﳉﺬﻭﺭ ﺍﻟﻌﺮﺿﻴﺔ  .1 1- )ﻣﺎﻳﻜﺮﻭﻏﺮﺍﻡ. ﻣﻞ150ﺍﻥ ﺍﻟﱰﻛﻴﺰ ﺍﻟﺴﺎﻡ ﻣﻦ ﺍﻟﺒﻮﺭﻭﻥ ﺍﳌﺘﻜﺸﻔﺔ ﰲ ﺍﻟﻌﻘﻞ ﺍﱃ ﺍﻟﻨﺼﻒ ﺗﻘﺮﻳﺒﺎ ﻣﻘﺎﺭﻧﺔ ﺑﻌﻘﻞ ﺍﻟﺴﻴﻄﺮﺓ. ﺃﻋﲆ ﺍﺳﺘﺠﺎﺑﺔ ﻟﺘﺠﺬﻳﺮ ﻋﻘﻞ ﺍﳌﺎﺵ.  .2 (ppm) 5 ﻳﻠﻴﻬﺎ ﻛﻠﻮﺭﻳﺪ ﺍﻟﺰﻧﻚ ﻋﻨﺪ ﺍﻟﱰﻛﻴﺰ (ppm) 1ﺣﻘﻘﺖ ﻛﱪﻳﺘﺎﺕ ﺍﻟﺰﻧﻚ ﻋﻨﺪ ﺍﻟﱰﻛﻴﺰ ﺍﻭﲠﺪﻑ ﲣﻔﻴﻒ ﺳﻤﻴﺔ ﺍﻟﺒﻮﺭﻭﻥ ﻓﻘﺪ ﺟﻬﺰﺕ ﻛﱪﻳﺘﺎﺕ ﻭﻛﻠﻮﺭﻳﺪ ﺍﻟﺰﻧﻚ ﻗﺒﻞ ﻭﺑﻌﺪ ﺍﻟﺘﻌﺮﺽ ﻟﻠﺴﻤﻴﺔ ﺍﻟﺒﻮﺭﻭﻥ ﻭﺳﻮﻳﺔ  .3 ﻭﻛﺎﻧﺖ ﺍﳌﻌﺎﻣﻠﺔ ﺍﻷﻓﻀﻞ ﰲ ﺍﺯﺍﻟﺔ ﺳﻤﻴﺔ ﺍﻟﺒﻮﺭﻭﻥ ﻋﻨﺪ ﲡﻬﻴﺰ ﺍﻟﻜﱪﻳﺘﺎﺕ ﺍﻭﻛﻠﻮﺭﻳﺪ ﺍﻟﺰﻧﻚ ﺑﻮﺟﻮﺩ ﺍﻻﻭﻛﺴﲔ ﻗﺒﻞ ﺍﻟﺘﻌﺮﺽ ﻟﻠﱰﻛﻴﺰ ﺍﻟﺴﺎﻡ ﺣﻴﺚ ﲤﺖ ﺍﺯﺍﻟﺔ ﺳﻤﻴﺔ ﺍﻟﺒﻮﺭﻭﻥ ﺑﺎﻟﻜﺎﻣﻞ ﻟﻜﻦ ﻣﻦ ﺧﻼﻝ ﲡﻬﻴﺰﻫﺎ ﻻﺣﻘﺎﹰ ﺑﺎﻻﻭﻛﺴﲔ. ﹰ  .4 ﺍﻥ ﺍﻟﺪﻭﺭ ﺍﻟﻮﻗﺎﺋﻲ ﻟﻠﻜﱪﻳﺘﺎﺕ ﻭﻛﻠﻮﺭﻳﺪ ﺍﻟﺰﻧﻚ ﲢﻘﻖ ﻣﻦ ﺧﻼﻝ ﺍﻟﺘﺸﺠﻴﻊ ﺍﳌﻌﻨﻮﻱ ﳌﻌﺪﻝ ﻋﺪﺩ ﺍﳉﺬﻭﺭ ﺍﳌﺘﻜﺸﻔﺔ ﻭﺻﻮﻻ ﺍﱃ ﻣﺴﺘﻮﺍﻫﺎ ﰲ ﻣﻌﺎﻣﻠﺔ ﺍﻟﺴﻴﻄﺮﺓ.

Zinc --- B-toxicity --- adventitious root --- mung bean. --- ﺍﻟﺰﻧﻚ، ﺳﻤﻴﺔ ﺍﻟﺒﻮﺭﻭﻥ، ﺍﳉﺬﻭﺭ ﺍﻟﻌﺮﺿﻴﺔ، ﻋﻘﻞ ﺍﳌﺎﺵ