پاسخ جوانه زنی، رشد اولیه و فنولوژی جو به پیش تیمار بذر و محلول پاشی سالیسیلیکاسید تحت شرایط تنش شوری

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی پیشین کارشناسی ارشد، گروه تولید زراعی و اصلاح نباتات، دانشکده کشاورزی، دانشگاه شیراز، شیراز، ایران

2 استاد،گروه تولید زراعی و اصلاح نباتات، دانشکده کشاورزی، دانشگاه شیراز، شیراز، ایران

3 استادیار پژوهش، مرکز ملی تحقیقات شوری، سازمان تحقیقات، آموزش و ترویج کشاورزی، یزد، ایران

چکیده

در این پژوهش، اثر غلظت و زمان پیش­تیمار بذر با سالیسیلیک اسید بر جوانه­زنی و رشد اولیه و اثر روش­های کاربرد آن تحت شرایط تنش شوری بر فنولوژی گیاه جو رقم ریحان در دو آزمایش جداگانه مورد مطالعه قرار گرفت.برای این منظور، اثر غلظت (در پنج سطح شاهد، 5/0، 75/0، 1 و 5/1 میلی­مولار) و زمان (در سه سطح 6، 12 و 24 ساعت) پیش­تیمارسالیسیلیکاسید در آزمایش اول و روش­های متفاوت کاربرد آن (بدون کاربرد، پیش­تیمار و محلول­پاشی در مراحل استقرار، برجستگی دوگانه و گلدهی) تحت شرایط متفاوت شوری (بدون تنش و تنش­های شوری 6 و 12 دسی­زیمنس برمتر) در آزمایش دوم بررسیشد. هر دو آزمایش بر پایه طرح کاملاً تصادفی با چهار تکرار در دانشکده کشاورزی دانشگاه شیراز در سال 1393 طراحی و اجرا شد. نتایج آزمایش اول نشان داد کهپیش­تیمار سالیسیلیکاسید با غلظت 5/1 میلی­مولار به­مدت 12 ساعت بیشترین تأثیر مطلوب را بر جوانه­زنی و رشد اولیه گیاهچه داشت که برای آزمایش بعدی انتخاب شد.نتایجآزمایش دوم نشان داد که تنش شوری 6 دسی­زیمنس برمتر موجب کاهش طول دوره­های کاشت تا گلدهی و کاشت تا رسیدگی فیزیولوژیک و شوری 12 دسی­زیمنس برمتر موجب کاهش طول دوره­های کاشت تا آبستنی، کاشتتا گلدهی و کاشتتا رسیدگی فیزیولوژیک شد. پیش­تیمار سالیسیلیکاسید موجب افزایش طول دوره­های رشد شد، درحالی­که تأخیر در کاربرد سالیسیلیکاسید از تأثیر مثبت آن کاست. محلول­پاشی در مرحله استقرار، طول دوره کاشت تا آبستنی، کاشت تا گلدهی و کاشت تا رسیدگی فیزیولوژیک را افزایش داد،اما محلول­پاشی در مرحله گلدهی تأثیری بر فنولوژی بوته­های جو نداشت. به­طور کلی، پیش­تیمار بذر یا محلول­پاشی سالیسیلیکاسید در مراحل اولیه رشد موجب تعدیل تسریع مراحل نمویناشی از تنش شوری شدو با افزایش شدت تنش شوری، کاربرد زودهنگام سالیسیلیکاسید از اهمیت بیشتری برخوردار بود.

کلیدواژه‌ها


عنوان مقاله [English]

Responses of germination, early growth and phenology of barley to salicylic acid under salinity stress conditions

نویسندگان [English]

  • Seyedeh Elahe Hashemi 1
  • Yahya Emam 2
  • Hadi Pirasteh-Anosheh 3
1 FormerM. Sc. Student, Dept. of Crop Production and Plant Breeding, Faculty of Agriculture, Shiraz University, Shiraz, Iran
2 Prof., Dept. of Crop Production and Plant Breeding, Faculty of Agriculture, Shiraz University, Shiraz, Iran
3 Research Assist. Prof., National Salinity Research Center, Agricultural Research, Education and Extension Organization (AREEO), Yazd, Iran
چکیده [English]

In this research, the effect of concentration and time of seed priming with salicylic acid on germination and early growth and it’s application methods under salinity stress conditions on phenology characteristics of barley, variety Reyhan, was studied in two separate experiments. The effect of concentration (in five levels, control, 0.5, 0.75, 1.0 and 1.5 mM) and time (in three levels, 6, 12 and 24 h) of seed priming by salicylic acid (SA) in the first experiment and different application methods of SA (no application, priming and spraying at the stages of establishment, double ridges and anthesis) under different salinity conditions (no stress and salinity of 6 and 12 dS.m-1)in the second experiment was evaluated. Both experiments were conducted as completely randomized design with four replications at College of Agriculture, Shiraz University, Iran, in 2014. The results of the first experiment showed that SA-priming with 1.5 mM for 12 h had the highest positive effect on germination and early growth, which was selected for the second experiment. The results of the second experiment showed that salinity stress of 6 dS.m-1 reduced the planting to anthesis period as well as planting to physiological ripening and 12 dS.m-1salinity stress also reduced the planting to booting, planting to anthesis and planting to physiological ripeningperiods. Seed priming with SA prolonged the growth periods, whereas the delay in SA application decreased its positive effect. Foliar application at establishment increased planting to booting, planting to anthesis as well as planting to physiological ripening periods,however foliar application at anthesis had no significant effect on phenology of barley plants. In total, seed priming or foliar application at establishment at early growth stages ameliorated the acceleration of the developmental stages due to salinity stress and early application of SA was found to be more important with increasing salinity stress.

کلیدواژه‌ها [English]

  • Anthesis
  • Booting
  • Development
  • Ripening
  • Seedling establishment
 

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