ALLIUM CEPA L. اثرات شوري بر رشد، پتانسيل آب برگ و ميزان پرولين دو رقم پياز خوراكي

Salinity effects on growth, leaf water potential and proline content in onion (Allium cepa L.) cultivars

The effects of NaCl salinity on growth traits, leaf water potential and proline content were investigated in onion (Allium cepa L. cv. Ghermez Rey and cv. Sefid Tarom Zanjan). Plants were grown by hydroponic under controlled greenhouse conditions and supplied with Hoagland solution with half-strength containing 0-100 mM NaCl. In this study, split plot design on R.C.B.D. base with 3 replications was used for traits analyzing. This pot experiment was done in sand: perlite mixture at 3:1 ratio. The results were showed that with increase in salt concentration levels, there was not found much differences between two cultivars in the values of leaf water potential and morphological characters. The increase salt concentration was caused significantly increase in proline production. Also, the role of this metabolite was high effective on salinity tolerance increasing especially in the Ghermez Rey cultivar.