ﺟﻮاﻧﻪ زﻧﯽ ﺑﺬر ﺧﺎﮐﺸﯿﺮ Descurainia sophia ﺗﺤﺖ ﺗﻨﺶ ﮐﻠﺮﯾﺪ ﺳﺪﯾﻢ

Germination of Flixweed (Descurainia Sophia) under NaCl stress

ﺟﻮاﻧﻪ زﻧﯽ ﻣﻮﻓﻖ ﺑﺬرﻫﺎ ﺑﺴﺘﮕﯽ ﺑﻪ وﺟﻮد ﻧﯿﺎزﻫﺎي ﻣﻌﻤﻮل ﺟﻮاﻧﻪ زﻧﯽ، و ﺳﻄﻮح ﻗﺎﺑﻞ ﺗﺤﻤﻞ ﻋﻮاﻣﻞ ﻣﺤﺪودﮐﻨﻨﺪه، در ﺻﻮرت وﺟﻮد، دارد. ﺷﻮري ﯾﮑﯽ از ﻋﻮاﻣﻞ ﻣﺤﯿﻄﯽ اﺳﺖ ﮐﻪ ﺳﺒﺐ ﻧﻘﺼﺎن ﺟﻮاﻧﻪ زﻧﯽ ﻣﯽ ﺷﻮد. اﯾﻦ آزﻣﺎﯾﺶ ﺑﺮاي ارزﯾﺎﺑﯽ اﺛﺮات ﺳﻄﻮح ﻣﺨﺘﻠﻒ ﻏﻠﻈﺖ ﮐﻠﺮﯾﺪ ﺳﺪﯾﻢ ﺷﺎﻣﻞ ﺻﻔﺮ ﺑﻌﻨﻮان ﺷﺎﻫﺪ، 1-، 2-، 3-، 4-، 5-، 6-، 7- و 8- ﺑﺎر ﺑﺮ ﺧﺼﻮﺻﯿﺎت ﺟﻮاﻧﻪ زﻧﯽ ﺧﺎﮐﺸﯿﺮ ) Descurainia sophia( در ﻗﺎﻟﺐ ﻃﺮح ﮐﺎﻣﻼ ﺗﺼﺎدﻓﯽ ﺑﺎ ﺳﻪ ﺗﮑﺮار ﺑﻪ اﺟﺮا در آﻣﺪ. ﻧﺘﺎﯾﺞ ﺣﺎﮐﯽ از اﺛﺮ ﻗﺎﺑﻞ ﻣﻼﺣﻈﻪ ﻏﻠﻈﺖ ﮐﻠﺮﯾﺪ ﺳﺪﯾﻢ ﺑﺮ ﺻﻔﺎت ﺟﻮاﻧﻪ زﻧﯽ ﺧﺎﮐﺸﯿﺮ ﺑﻮد؛ ﺑﻪ ﻧﺤﻮي ﮐﻪ ﺷﺮاﯾﻂ ﺗﻨﺶ ﺳﺒﺐ ﺑﺎزدارﻧﺪﮔﯽ ﺟﻮاﻧﻪ زﻧﯽ ﺷﺪ. روﻧﺪ ﮐﺎﻫﺸﯽ ﺑﺮاي درﺻﺪ، ﺳﺮﻋﺖ و ﺿﺮﯾﺐ ﺳﺮﻋﺖ و ﯾﮑﻨﻮاﺧﺘﯽ ﺟﻮاﻧﻪ زﻧﯽ ﻣﺸﺎﻫﺪه ﺷﺪ. در ﻣﻘﺎﺑﻞ زﻣﺎن ﻣﻮردﻧﯿﺎز ﺑﺮاي وﻗﻮع ﻣﻘﺪار ﻣﻌﯿﻦ ﺟﻮاﻧﻪ زﻧﯽ اﻓﺰاﯾﺶ ﯾﺎﻓﺖ. ﺟﻮاﻧﻪ زﻧﯽ در ﻏﻈﺖ ﻫﺎي -7و -8 ﺑﺎر رخ ﻧﺪاد. ﺑﺮاﺳﺎس ﻧﺘﺎﯾﺞ اﯾﻦ آزﻣﺎﯾﺶ ﻣﯽ ﺗﻮان اﻇﻬﺎر داﺷﺖ ﮐﻪ ﺧﺎﮐﺸﯿﺮ ﺣﺴﺎﺳﯿﺖ ﻗﺎﺑﻞ ﺗﻮﺟﻬﯽ ﺑﻪ ﺳﻄﻮح ﺑﺎﻻي ﻧﻤﮏ ﮐﻠﺮﯾﺪ ﺳﺪﯾﻢ دارد.

Successful germination of seeds depends on availability of germination usual requirements, and tolerable level of environmental limiting factors, if exist. Salinity is one of the environmental causes that curtail germination. This experiment was conducted for investigating the effects of different NaCl concentration levels including zero as a control, -1, -2, -3, -4, -5, -6, -7, and -8 bar on germination characteristics of Flixweed (Descurainia sophia) in a completely randomized design with three replicates. Result demonstrated that germination traits of Flixweed are greatly affected by NaCl; where germination was inhibited under stress condition. Reducing trend were observed for germination percentage, rate, and velocity and uniformity coefficient. On the contrary time needed for occurring a certain extent of germination increased. No germination occurred at NaCl concentration of -7 and -8 bar. Drawn from the results of this study, it can be concluded that flixweed is a sensitive species to salinity.