بررسي پرايمينگ شوري و سطوح مختلف شوري روي خصوصيات جوانه‌زني سه رقم سورگوم

Evaluation of NaCl priming and salinity levels on germination trait in three cultivar of sorghum (Sorghum bicolor L.)

به منظور بررسي اثر پرايمينگ شوري روي جوانه‌زني سورگوم، آزمايشي به صورت فاكتوريل در قالب طرح كاملاً تصادفي در 3 تكرار انجام گرفت. فاكتور اول شامل سه رقم كيميا، جامبو و اسپيدفيد و فاكتوردوم شامل سطوح مختلف پرايمينگ در سه سطح شوري 0، 5/0،و1 مولاركلريد سديم به مدت 8 ساعت نگهداري بذور در اين محلول‌ها و فاكتورسوم، غلظت محلول كلريد سديم شامل محلول‌هاي 3-، 6-، 9- ،12- بار و آب مقطر (شاهد) بود. نتايج نشان دادكه پرايمينگ شوري روي خصوصيات جوانه‌زني سورگوم اثرمعني‌داري دارد به طوري‌كه بذورپرايم شده درمحلول‌هاي 5/0 و1مولار شوري، بجز سرعت جوانه‌زني در بقيه صفات جوانه‌زني به طور معني‌داري نسبت به شاهد كاهش نشان دادند. در ضمن مشخص گرديد كه ارقام تحت بررسي از نظر درصد جوانه‌زني، وزن خشك ريشه‌چه و ساقه‌چه و سرعت جوانه‌زني با يكديگر اختلاف معني‌داري دارند هرچنداين اختلاف درطول ريشه‌چه وساقه‌چه مشاهده نگرديد. رقم كيميا مقاومترين و رقم اسپيدفيد حساسترين رقم به شوري بود.

In order to study of Evaluation of NACL priming and salinity levels on germination traits in three cultivars of sorghum (Sorghum bicolor L.), an experiment was conducted under laboratory conditions in Tehran University in 2006. This study was carried out Factorial experiment based on RCD design with 3 replications to determine the influence of priming (0.5, 1 molar Nacl solution and control with distilled water), Salinity (0,-3, -6,-9,-12 bar) and sorghum varieties (Kimia, Jambo and Speedfid). Seeds of three cultivars of sorghum were subjected to salt priming pre-treatments in order to improve the germination and emergence at normal temperature, for this reason seeds were primed with 0.5 and 1.0 M NaCl solutions with control treatment that was named nonprimed for 8 hour. Plants were then germinated at 0, -3, -6, -9 and -12 bar solution of NaCl. The effect of seed priming on germination traits were different depending on both the NaCl concentration were applied for seed priming and the NaCl concentration were applied for pre-emergence salt treatments. Results indicated that seed priming treatments were significantly decreased germination percent, root weight, plumule weight and were significantly increased germination rate, Root length and plumule length, meanwhile it was observed that the cultivars under consideration had significantly differences in germination percentage, root weight, plumule weight and germination rate but they had no significantly differences in root length and plumule length. The cultivar of Kimia was the most resistant and Spidfid was the most sensitive to salt stress condition.