اثر تیمارهای پوشش‏دهی بذر بر سبزشدن و رشد گیاهچه کلزا و رشد قارچ‏های بیمارگر

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد

2 عضو هیات علمی دانشگاه تهران

چکیده

این تحقیق به‏منظور بررسی اثر تیمارهای پوشش‏دهی بذر بر استقرار گیاهچه کلزا در شرایط شاهد، تنش شوری و خشکی و رشد قارچ‏های بیمارگر، در پردیس ابوریحان دانشگاه تهران در سال 1395 انجام شد. به این منظور بذرهای کلزا (رقم نپتون) در 10 تیمار مختلف پوشش‏دهی شدند (T1 تا T10) که از لحاظ نوع پرایمینگ، نوع پوشش و مصرف قارچکش تفاوت داشتند. کمی‏سازی سبزشدن بذرهای پوشش‏دار شده با کمک مدل چاپمن- ریچاردز صورت گرفت و مقایسه تیمارها با کمک پارامترهای مدل انجام شد. نتایج نشان داد که تیمارهای بذری که در آنها بذرها با هیومیک اسید پرایمینگ شده بودند (T3، T6 و T9)، سرعت و درصد سبزشدن بهتری در هر سه شرایط داشتند. در شرایط شاهد بیشترین وزن خشک گیاهچه مربوط به تیمار T3 (077/0 گرم) و T9 (074/0 گرم) بود که در آنها بذرها با هیومیک اسید پرایم شده بودند. تیمار حبه‏کردن بذر با قارچ‏کش بیشترین اثر بر کاهش رشد قارچ‏های بیمارگر داشت و هر سه قارچ مورد مطالعه کمترین رشد قارچ را در شرایط حبه‏کردن و مصرف قارچکش داشتند. به‏طورکلی، نتایج این تحقیق نشان داد که شرایط تنش موجب اثرات منفی بر سبزشدن و رشد گیاهچه کلزا گردید که استفاده از تیمارهای بهبود بذر و پوشش‏دهی تا حدی توانست این اثرات را تخفیف دهد. در مجموع، در میان تیمارهای مورد مطالعه، حبه‏کردن بذر به همراه قارچکش و کاربرد هیومیک اسید به‏صورت پرایمینگ (یعنی T6) بهترین تیمار بود.

کلیدواژه‌ها


عنوان مقاله [English]

The effects of seed coating treatments on seedling emergence and growth of rapeseed and the growth of pathogenic fungi

نویسندگان [English]

  • Shirin Taghi zoughi 1
  • Elias Soltani 2
  • Iraj Allah dadi 2
  • Reza Sadeghi 2
چکیده [English]

In order to investigate the effect of accelerated ageing and priming on biochemical and germination indices of cumin, a two factors experiment was conducted based on completely random design with four replications. Experimental factors were included seed deterioration in four levels (control, 12, 24, 36 hours) and priming in five levels (urea and KH2PO4 in two Osmotic potentials of -1 and -1.5 Mpa, and hydro-priming with distilled water). The highest catalase and ascorbate peroxidase activities as well as soluble protein content were observed in the non-deteriorated seeds primed with KH2PO4 -1.5 Mpa. Also that the highest germination percentage (86%) and germination rate (2.34 seed day-1), seedling length vigor index (4.90) and the lowest mean germination time (8.4 day) related to the non-deteriorated seeds primed with KH2PO4 -1.5 Mpa. The biggest shoot (3.52cm) and root (2.32cm) length attained from not deteriorate seeds that primed with urea -1.5 Mpa. Generally, the results showed that priming by KH2PO4 with osmotic potential of -1.5 Mpa could improve vigor of deteriorated seed of cumin.

کلیدواژه‌ها [English]

  • Antioxidant enzyme
  • Cumin
  • Germination
  • Osmopriming
  • Soluble protein
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