بررسی تاثیر تنش خشکی ناشی از پلیاتیلن گلیکول بر مولفههای جوانهزنی
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اصل مقاله (116.51 K)
عنوان دوره: سیزدهمین کنگره زراعت و اصلاح نباتات ایران
نویسندگان
1دانشجوی کارشناسی ارشد پردیس ابوریحان دانشگاه تهران،
2استاد پردیس ابوریحان دانشگاه تهران
3استادیار پردیس ابوریحان دانشگاه تهران
چکیده
زﻧﻴﺎن ﺑﺎ ﻧﺎم ﻋﻠﻤﻲ )Carum copticum L.( ﮔﻴﺎﻫﻲ ﻋﻠﻔﻲ و ﻳﻜﺴﺎﻟﻪ از ﺗﻴﺮه ﭼﺘﺮﻳﺎن اﺳﺖ. ﺟﻮاﻧﻪزﻧﻲ ﻛﻪ اوﻟﻴﻦ ﻣﺮﺣﻠﻪ در ﭼﺮﺧﻪ زﻧﺪﮔﻲ ﮔﻴﺎه اﺳﺖ ﻧﻘﺶ ﺗﻌﻴﻴﻦ ﻛﻨﻨﺪهای در اﺳﺘﻘﺮار ﮔﻴﺎﻫﭽﻪ دارد. ﺑﻪ ﻣﻨﻈﻮر ﻣﻄﺎﻟﻌﻪ اﺛﺮ ﺗﻨﺶ ﺧﺸﻜﻲ ﻧﺎﺷﻲ از ﭘﻠﻲاﺗﻴﻠﻦ ﮔﻠﻴﻜﻮل )(PEG ﺑﺮ درﺻﺪ ﺟﻮاﻧﻪزﻧﻲ، ﺳﺮﻋﺖ ﺟﻮاﻧﻪزﻧﻲ، ﻃﻮل رﻳﺸﻪﭼﻪ و ﺳﺎﻗﻪﭼﻪ در 21ﺗﻮده زﻧﻴﺎن، آزﻣﺎﻳﺸﻲ ﺑﻪ ﺻﻮرت ﻓﺎﻛﺘﻮرﻳﻞ و در ﻗﺎﻟﺐ ﻃﺮح ﺑﻠﻮکﻫﺎی ﻛﺎﻣﻞ ﺗﺼﺎدﻓﻲ ﺑﺎ 2 ﻓﺎﻛﺘﻮر و 3 ﺗﻜﺮار اﻧﺠﺎم ﺷﺪ. ﺗﻴﻤﺎرﻫﺎی آزﻣﺎﻳﺶ ﺷﺎﻣﻞ ﺗﻮده در 21 ﺳﻄﺢ و ﺳﻄﻮح ﺧﺸﻜﻲ در 5 ﺳﻄﺢ )4- ، 3- ، 2 - ، 1- ،0 ﺑﺎر( ﺑﻮد. ﻧﺘﺎﻳﺞ ﺑﺪﺳﺖ آﻣﺪه ﻧﺸﺎن داد از ﻧﻈﺮ ﻛﻠﻴﻪ ﺻﻔﺎت ﻣﻮرد ﺑﺮرﺳﻲ ﺑﻴﻦ ﺗﻮدهﻫﺎ و ﺑﻴﻦ ﺳﻄﻮح ﺧﺸﻜﻲ اﺧﺘﻼف ﻣﻌﻨﻲداری وﺟﻮد داﺷﺘﻪ اﺳﺖ. ﺑﻪ ﻃﻮری ﻛﻪ ﺑﺎ ﻛﺎﻫﺶ ﭘﺘﺎﻧﺴﻴﻞ آب ﻫﻤﻪ ﻣﺆﻟﻔﻪﻫﺎی ﺟﻮاﻧﻪزﻧﻲ در ﺗﻤﺎﻣﻲ ﺗﻮدهﻫﺎی زﻧﻴﺎن ﻛﺎﻫﺶ ﻳﺎﻓﺖ. ﻫﻤﭽﻨﻴﻦ ﺑﺎ ﻣﻘﺎﻳﺴﻪ ﺗﻮدهﻫﺎ ﺗﻮﺳﻂ ﻣﻮﻟﻔﻪﻫﺎی ﻣﻮرد ﺑﺮرﺳﻲ ﻣﺸﺨﺺ ﺷﺪ ﻛﻪ ﺗﻮدهﻫﺎی ﻳﺰد و ﻗﻢ در ﻣﺮﺣﻠﻪ ﺟﻮاﻧﻪزﻧﻲ ﻣﻘﺎوﻣﺖ ﺑﻴﺸﺘﺮی در ﺑﺮاﺑﺮ ﺗﻨﺶ ﺧﺸﻜﻲ دارﻧﺪ. ﺻﻔﺖ ﻃﻮل رﻳﺸﻪﭼﻪ ﺑﻪ دﻟﻴﻞ وارﺛﺖ ﭘﺬﻳﺮی ﺑﺎﻻ ﻣﻲﺗﻮاﻧﺪ ﺑﻪ ﻋﻨﻮان ﺻﻔﺘﻲ ﻗﺎﺑﻞ اﻃﻤﻴﻨﺎن در ﮔﺰﻳﻨﺶ ﻣﻮرد اﺳﺘﻔﺎده ﻗﺮار ﮔﻴﺮد.
کلیدواژه ها
Title
Effect of drought stress on germination related traits of some accesions of Ajowan ( Carum copticum L.)
Authors
Abstract
Ajowan (Carum copticum L.) is an annual grass from Apiaceae family. Germination which is the first stage
in the life cycle of plant has a decisive role in seedling establishment. To study the effect of drought stress
induced by polyethylene glycol (PEG) on percentage and rate of germination, length of root and shoot in 21
Ajowan accessions an experiment in a randomized complete block design with two factors and three
replications was conducted. Treatments included genotypes (21 accessions) and drought stress including five
levels of water potential simulated by PEG (0, -1, -2, -3 and -4 bar). The results showed that for all traits
there were significant differences among genotypes and among different drought levels. All germination
components reduced with decreasing in water potential in all Ajowan accessions. Also with comparing the
accessions regarding the germination components it was determined that the accession of Qom and Yazd
were more resistant to drought stress at germination stage. Because of the length of root had the highest
heritability it has high potential for reliable selection in breeding programs.
in the life cycle of plant has a decisive role in seedling establishment. To study the effect of drought stress
induced by polyethylene glycol (PEG) on percentage and rate of germination, length of root and shoot in 21
Ajowan accessions an experiment in a randomized complete block design with two factors and three
replications was conducted. Treatments included genotypes (21 accessions) and drought stress including five
levels of water potential simulated by PEG (0, -1, -2, -3 and -4 bar). The results showed that for all traits
there were significant differences among genotypes and among different drought levels. All germination
components reduced with decreasing in water potential in all Ajowan accessions. Also with comparing the
accessions regarding the germination components it was determined that the accession of Qom and Yazd
were more resistant to drought stress at germination stage. Because of the length of root had the highest
heritability it has high potential for reliable selection in breeding programs.
Keywords
Ajowan, drought stress, germination, PEG