تأثیر جایگاه بذر بر گیاه مادری و تنش شوری بر خصوصیات جوانه‌زنی بذر گیاه اکالیپتوس

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استادیار دانشکدة منابع طبیعی و کویرشناسی دانشگاه یزد، یزد، ایران

2 کارشناس ارشد مدیریت مناطق بیابانی، یزد، ایران

3 دانشجوی کارشناسی ارشد مدیریت مناطق بیابانی، دانشکدة منابع طبیعی و کویرشناسی دانشگاه یزد، یزد، ایران

چکیده

به ‏منظور بررسی تأثیر ارتفاع قرارگیری بذر روی درخت، تنش شوری و تأثیر متقابل این دو عامل بر جوانه‌زنی بذر گیاه اکالیپتوس آزمایشی به‏ صورت فاکتوریل در قالب طرح کاملاً تصادفی در سه تکرار و با سطوح شوری 0، 50، 100، 150، 200 میلی‏مولار سدیم کلرید روی بذرهای جمع‏آوری‌شده در سه ارتفاع بالا، میانی، و پایین تاج‏پوشش درخت انجام شد. همچنین، هدایت الکتریکی برگ گیاه و وزن هزاردانة بذر در سه ارتفاع اندازه‌گیری شد. نتایج نشان داد وزن هزاردانة بذر و هدایت الکتریکی برگ در سه ارتفاع اختلاف معنادار (05/0p<) دارد. بیشترین هدایت الکتریکی برگ و بیشترین وزن هزاردانه مربوط به بذرهای میانی تاج‏پوشش گیاه بود. همچنین، نتایج نشان داد افزایش غلظت نمک درصد و سرعت جوانه‏زنی، متوسط جوانه‏زنی روزانه، شاخص جوانه‏زنی طول ریشه‏چه و ساقه‏چه، و بنیة بذر را به صورت معنا‏دار (01/0p<) کاهش می‌دهد. با این حال، روند کاهش این صفات در بذرهای قرارگرفته در ارتفاعات مطالعه‌شده متفاوت بود. بیشترین شاخص جوانه‏زنی، سرعت جوانه‏زنی روزانه، سرعت جوانه‏زنی، طول ریشه‏چه و ساقه‏چه، و بنیة بذر از آنِ بذرهای جمع‏آوری‌شده از ارتفاع میانی تاج‌پوشش درخت و بیشترین درصد جوانه‌زنی در بذرهای پایینی بود.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of the Seed Location on the Mother Plant and Salinity Stress on Seed Germination Characteristics of Eucalyptus comaldulensis Dehnh

نویسندگان [English]

  • Hamid Sodaeizade 1
  • Mahdiyeh Tajamolian 2
  • Mojdeh Khojasta 3
1 Assistant Professor, Yazd University, Yazd, I.R. Iran
2 M. Sc. of Dry Lands and Deserts Management, Yazd, I.R. Iran
3 M. Sc. Student of Dry Lands and Deserts Management, Faculty of Natural Resources, Yazd University, Yazd, I.R. Iran
چکیده [English]

The present study was conducted to evaluate the effects of these two factors as well as their interaction on seed germination of eucalyptus (E. camaldulensis). A factorial experiment based on a completely randomized design with three replications was used. Five salinity levels including 0, 50, 100, 150, 200 mM sodium chloride were tested on seed collected at top, middle and bottom of the tree. Also the electrical conductivity of leaves as well as 1000 - seed weight were measured in three different tree heights. Result showed that 1000 - seed weight and electrical conductivity of leaves were significantly different (p<0.05) in three heights. Maximum leaves electrical conductivity and 1000 - seed weight were obtained in seeds collected from middle Crown depth. Furthermore, total seed germination percentage, speed of germination, mean daily germination, Germination index, shoot and root length, as well as seed vigor were significantly reduced (p<0.01) with increasing the salinity stress. However, the responses were difference based on location of seeds on the mother tree. Highest mean daily germination, Germination index, speed of germination, root and shoot length and seed vigor were obtained in seeds collected from the middle Crown depth, whereas maximum seed germination percentage was related to seeds located at the lower high of the tree.

کلیدواژه‌ها [English]

  • Germination percentage
  • leaves electrical conductivity
  • Seed vigor
  • Yazd
  • 1000 - seed weight
 

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