ﻓﻌﺎﻟﯿﺖ ﻓﺘﻮﺳﯿﺴﺘﻢ II زﻧﺠﯿﺮه اﻧﺘﻘﺎل اﻟﮑﺘﺮون ﻓﺘﻮﺳﻨﺘﺰي ﮐﻠﺰا ﺗﺤﺖ ﺳﻄﻮح ﻣﺨﺘﻠﻒ آﺑﯿﺎري ﺑﺎ ﮐﺎرﺑﺮد ﻫﯿﻮﻣﯿﮏ اﺳﯿﺪ

Photosystem II activity in electron transport flux of rapeseed photosynthesis under different watering conditions with humic acid application

ﺑﺮاي ﻣﻘﺎﺑﻠﻪ ﺑﺎ اﺛﺮات ﻣﺨﺮب ﺗﻨﺶ ﮐﻤﺒﻮد آب و ﺑﻬﺒﻮد ﻋﻤﻠﮑﺮد ﮔﯿﺎﻫﺎن زراﻋﯽ، ﻫﯿﻮﻣﯿﮏ اﺳﯿﺪ ﺑﺮ ﻓﻌﺎﻟﯿﺖ ﻓﺘﻮﺳﻨﺘﺰي ﮐﻠﺰا ﺗﺤﺖ ﺗﻨﺶ ﺧﺸﮑﯽ ﭘﺮداﺧﺘﻪ ﺷﺪ. آزﻣﺎﯾﺶ ﺑﻪ ﺻﻮرت ﻓﺎﮐﺘﻮرﯾﻞ دو ﻋﺎﻣﻠﯽ ﺑﺮ ﭘﺎﯾﻪ ﻃﺮح ﺑﻠﻮك ﮐﺎﻣﻞ ﺗﺼﺎدﻓﯽ در ﺳﻪ ﺗﮑﺮار ﺑﻪ اﺟﺮا در آﻣﺪ. ﻋﺎﻣﻞ اول ﺳﻄﻮح ﻣﺨﺘﻠﻒ آﺑﯿﺎري ﺷﺎﻣﻞ 50 )ﺷﺎﻫﺪ،( 80 )ﺗﻨﺶ ﻣﻼﯾﻢ( و 110 )ﺗﻨﺶ ﺷﺪﯾﺪ( ﻣﯿﻠﯽﻣﺘﺮ ﺗﺒﺨﯿﺮ از ﺗﺸﺘﮏ ﺗﺒﺨﯿﺮ ﮐﻼس A و ﻋﺎﻣﻞ دوم ﺗﯿﻤﺎر 500 ﻣﯿﻠﯽ ﮔﺮم ﺑﺮ ﻟﯿﺘﺮ ﻫﯿﻮﻣﯿﮏ اﺳﯿﺪ ﺑﻪ ﻫﻤﺮاه ﺷﺎﻫﺪ )ﺑﺪون ﺗﯿﻤﺎر ﺑﺎ اﺳﯿﺪ ﻫﯿﻮﻣﯿﮏ( ﺑﻮد. ﻧﺘﺎﯾﺞ ﺣﺎﺻﻞ از آزﻣﺎﯾﺶ ﻧﺸﺎن داد ﮐﻪ ﺗﯿﻤﺎر ﻫﯿﻮﻣﯿﮏ اﺳﯿﺪ ﻓﻌﺎﻟﯿﺖ ﮐﻤﭙﻠﮑﺲ ﺗﺠﺰﯾﻪ ﮐﻨﻨﺪه آب در ﻓﺘﻮﺳﯿﺴﺘﻢ II، ﺟﺮﯾﺎن اﻧﺘﻘﺎل اﻟﮑﺘﺮون در واﺣﺪ ﻣﺮﮐﺰ واﮐﻨﺸﯽ، ﺣﺪاﮐﺜﺮ ﻋﻤﻠﮑﺮد ﻓﺘﻮﺷﯿﻤﯿﺎﯾﯽ ﮐﻮاﻧﺘﻮﻣﯽ ﻓﺘﻮﺳﯿﺴﺘﻢ II را ﺑﻪ ﺗﺮﺗﯿﺐ ﺑﻪ ﻣﯿﺰان 22 ،21 و درﺻﺪ ﺑﻄﻮر ﻣ5 ﻌﻨﯽ داري ﻧﺴﺒﺖ ﺑﻪ ﻋﺪم ﮐﺎرﺑﺮد آن ﺗﺤﺖ ﺳﻄﻮح ﻣﺨﺘﻠﻒ آﺑﯿﺎري اﻓﺰاﯾﺶ داد. ﺑﻨﺎﺑﺮاﯾﻦ، اﻋﻤﺎل روش ﻫﺎي ﺻﺤﯿﺢ ﻣﺪﯾﺮﯾﺖ زراﻋﯽ ﻫﻤﭽﻮن اﺳﺘﻔﺎده از ﻣﻮاد آﻟﯽ ﻫﯿﻮﻣﯿﮏ اﺳﯿﺪ ﻣﯽﺗﻮاﻧﺪ ﺿﻤﻦ ﺑﻬﺒﻮد ﻓﻌﺎﻟﯿﺖ ﻓﺘﻮﺳﻨﺘﺰي ﮔﯿﺎﻫﺎن در رﺷﺪ و ﺗﻮﻟﯿﺪ ﻣﺤﺼﻮﻻت ﮐﺸﺎورزي ﻣﻮﺛﺮ ﺑﺎﺷﺪ.

To resolve and to improve crop performance, the role of humic acid as organic material on photosynthetic activity of rapeseed plants under water stress condition was evaluated. A factorial experiment based on RCBD design with three replicates was conducted. First factor was different levels of watering as 50mm (control), 80mm (middle water stress) and 110mm (severe water stress) evaporation from class A pan and the second factor was application of 500 mg/l humic acid and without application of humic acid as control. The results indicated that application of humic acid significantly increased the activity of the water-splitting complex on the donor side of PSII, electron transport flux per RC and maximum quantum yield of PSII photochemistry 21, 22 and 5 percent respectively, compared to control under different watering condition. Therefore, to increases and sustainability of crop productivity, application of humic acid can increase plants photosynthesis activity and crop productivity