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اثر پیشتیمار اسید سالیسیلیک بر جوانهزنی بذرهای خیار و هندوانه تحت تنش شوری | ||
علوم و تحقیقات بذر ایران | ||
مقاله 2، دوره 3، شماره 4، دی 1395، صفحه 15-27 اصل مقاله (928.21 K) | ||
نوع مقاله: مقاله پژوهشی | ||
نویسندگان | ||
سالومه طاهری* ؛ طاهر برزگر؛ افسانه زعیم زاده | ||
دانشگاه زنجان | ||
چکیده | ||
تنش شوری یکی از مهمترین تنشهای محیطی میباشد که رشد و عملکرد گیاهان را تحت تاثیر قرار میدهد. بهمنظور بررسی اثر شوری و اسید سالیسیلیک بر جوانهزنی بذرهای خیار رقم سوپر دومینوس و هندوانه رقم کریمسون سوئیت، دو آزمایش بهصورت فاکتوریل در قالب طرح کاملا تصادفی با سه تکرار انجام شد. تیمارهای هر دو آزمایش شامل شوری در چهار سطح صفر، 2، 4 و 6 دسیزیمنس بر متر، کلرید سدیم و اسید سالیسیلیک در سه سطح صفر، 5/0 و 1 میلیمولار بود. درصد و سرعت جوانهزنی، طول ریشهچه و ساقهچه، وزن تر و خشک ریشهچه و ساقهچه، شاخص بنیه بذر و انرژی جوانهزنی بذر اندازهگیری شد. نتایج نشان داد که شوری بهطور معنیداری جوانهزنی و رشد گیاهچه را کاهش داد. کمترین درصد جوانهزنی در خیار (65/86 درصد) و هندوانه (63/69 درصد) و سرعت جوانهزنی در خیار (79/18) و هندوانه (33/10) و شاخص بنیه بذر در خیار (93/17) و هندوانه (59/9) در سطح شوری 6 دسیزیمنس بر متر مشاهده شد. اسید سالیسیلیک شاخصهای جوانهزنی بذرهای خیار و هندوانه را بهبود بخشید. بیشترین درصد جوانهزنی در تیمار 1 میلیمولار اسید سالیسیلیک در شرایط بدون شوری حاصل شد. با توجه به نتایج، میتوان پیشتیمار بذرهای خیار و هندوانه با غلظت 1 میلیمولار اسید سالیسیلیک را برای بهبود جوانهزنی و سرعت رشد گیاهچه در شرایط شوری توصیه نمود. | ||
کلیدواژهها | ||
انرژی جوانهزنی؛ تیمار؛ رشد گیاهچه؛ شاخص بنیه بذر؛ طول ریشهچه | ||
مراجع | ||
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