روند جوانه‌زنی و پیشبینی ضرایب قابلیت حیات بذر سورگوم دانهای رقم کیمیا تحت شرایط مختلف انبارداری

نوع مقاله : مقاله پژوهشی

نویسنده

دانشیار، مرکز تحقیقات کشاورزی و منابع طبیعی استان یزد

چکیده

شرایط نامساعد انبارداری،به‌خصوص رطوبت نسبی زیاد محیط انبار و دمای زیاد، به‌شدت بر کیفیت بذر اثر می‌گذارد. به‌منظور کمّی‌سازی اثر دما و رطوبت بر زوال بذر و تعیین ضرایب حیات، این آزمایش در آزمایشگاه مرکز تحقیقات کشاورزی و منابع طبیعی استان یزد اجرا شد. به این منظور، چهار تیمار دمایی (5، 15، 25 و 35 درجة سانتی‌گراد) و سه تیمار رطوبتی (6، 10 و 14 درصد) استفاده شدند. ضرایب قابلیت حیات با استفاده از معادلة الیس و روبرتس و از طریق تجزیة پروبیت مقایسه شدند. روند جوانه‌زنی بذر سورگوم در شرایط مختلف انبارداری نشان داد با افزایش دورة انبارداری، درصد جوانه‌زنی کاهش یافت و این کاهش در دماها و رطوبت‌های مختلف متفاوت بود. با افزایش رطوبت و دمای انبارداری، کاهش درصد جوانه‌زنی بیشتر بود، به‌طوری‌که در دمای 35 درجة سانتی‌گراد و رطوبت 14 درصد بعد از 90 روز انبارداری، جوانه‌زنی به 11 درصد رسید. کمترین سطح زوال در دمای 5 درجة سانتی‌گراد با محتوای رطوبت 6 درصد مشاهده شد که بعد از 200 روز انبارداری، جوانه‌زنی از 84 به 76 درصد کاهش یافت. نتایج نشان داد کهمقدار KE، CW، CH و CQ به‌ترتیب 49/9، 30019/6- ، 02725/0 و 00057/0-  بود. به‌طور کلی می‌توان گفت که با افزایش درجة حرارت و رطوبت بذر در طی انبارداری، درصد زنده‌مانی بذر کاهش می‌یابد. سرعت کاهش زنده‌مانی بذرها در دماها و رطوبت های بالاتر، بیشتر است.

کلیدواژه‌ها

عنوان مقاله [English]

Determination of seed viability constants in sorghum under various storage conditions

نویسنده [English]

  • Seyyed Ali Tabatabaei
Faculty Member, Agricultural and Natural Resources ReasearchCenter of Yazd, Iran
چکیده [English]

Adverse environmental storage conditions including high temperature and relative humidity could affect seed quality. The objective of this investigation was to quantify relationship between temperatures and seed moisture on seed deterioration and determination viability constants in sorghum. Four storage temperatures (5, 15, 25 and 35oC) and three moister content levels (6, 10 and 14%) were used. We carry out coefficients viability with use of Ellis and Roberts equation and were compared using Probit analysis. Process of germination of Sorghum seeds indicated that germination percentage decreased as the storage period progressed. Increased of moister and temperature of storage decreased germination.  Germination percentage of seeds with 14% moisture content stored at 35oC and 6% moister was 11%. According to the results, seeds with 6% moisture content stored at 5oC and 6% moister content had the highest germination percentage and the least deteriorated state even after 200 days. Estimates of KE, CW, CH and CQ were 2.49, -0.30019, 0.00725 and -0.00057 respectively. Moreover, our results provide convincing evidence that storage in various storage conditions can reduced seed viability.  Also the results show that with increasing in moisture content, in each temperature, especially in high temperature, seed longevity decrease, is higher with increase in moisture content.

کلیدواژه‌ها [English]

  • Germination percentage
  • Seed viability constants
  • Sorghum
  • storage

مراجع

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سابقه مقاله

  • تاریخ دریافت: 08 تیر 1392
  • تاریخ بازنگری: 29 اردیبهشت 1394
  • تاریخ پذیرش: 09 بهمن 1392
  • تاریخ انتشار: 01 مهر 1393

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