اﺛﺮ ﺗﻨﺶ ﻗﻠﻴﺎﻳﻲ ﺑﺮ ﺷﺎﺧﺺ ﻫﺎی ﺟﻮاﻧﻪ زﻧﻲ و رﺷﺪ ﮔﻴﺎﻫﭽﻪ ﮔﺎوداﻧﻪ (Vicia ervilia L)

The aim of this study was to evaluate the effects of Na2CO3 levels (0, 5, 10, 15, 20 and 25 mM) on seed germination and seedling vigour of three local bitter vetch cultivars (Buinzahra, Shahreza and Tarom). The experimental design was factorial arranged in a completely randomized design. The results indicated that increasing Na2CO3 concentrations caused decrease in Germination percentage (GP), germination rate (GR), seedling length and seedling dry weight (SLDW). In 5 and 10 mM levels of Na2CO3, the reduction of germination percentage was negligible and there was no significant difference between these concentrations with control treatment. The decreasing germination rate occurring between 0 and 10 mM Na2CO3 was considered negligible in Buinzahra cultivar. For other cultivars, the significant decline in germination rate was observed in concentrations more than 5 mM. The rate of reduction in shoot length in comparison with the control in different concentrations of Na2CO3 was detected from Buinzahra as 30-92%, Shahreza 39-97% and Tarom 13-83%. Decrease in root length was more than shoot length in all the cultivars at each Na2CO3 level, as compared to the control. There was remarkable decrease in seedling dry weight under 5 mM Na2CO3 for Buinzahra and Shahreza, but seedling dry weight of Tarom did not show significant difference between the control and 5 mM alkalinity.