نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، دانشکده کشاورزی و منابع طبیعی دانشگاه اردکان، اردکان، ایران

2 دانشیار، دانشکده کشاورزی و منابع طبیعی دانشگاه اردکان، اردکان، ایران

10.22059/ijhs.2021.323696.1929

چکیده

به­منظور بررسی تاثیر طیف­های مختلف نوری بر رشد و ویژگی­های فتوسنتزی چهار رقم گیاه حسن­یوسف ("رِد"، "بلک دراگون"، "ولوت رد" و "ایمپرود") آزمایشی درون شش اتاقک رشد مجهز به نور معمولی گلخانه (شاهد)، 100درصد نور آبی، 15درصد نور آبی+85 درصد نور قرمز، 30 درصد نور آبی+70 درصد نور قرمز، 15 درصد نور آبی+65 درصد نور قرمز+20 درصد نور سفید و 30 درصد نور آبی+50 درصد نور قرمز+20 درصد نور سفید، به­صورت فاکتوریل در قالب طرح کاملاً تصادفی انجام شد. پس از پنج هفته قرارگیری گیاهان تحت نورهای مختلف، پارامترهای بیوفیزیک فتوسنتزی و خصوصیات رشدی گیاهان بررسی شد. بیشترین میزان شاخص حداکثر کارایی کوانتومی فتوسیستم II و حداکثر فلورسانس متغیر نسبی (FM/F0) در تیمارهای ترکیبی 30 درصد آبی+70 درصد قرمز (رقم "رد")، شاهد (رقم­های "بلک دراگون" و "ولوت رد") و تیمار ترکیبی 30 درصد آبی+50 درصد قرمز+20 درصد سفید (رقم "ایمپرود") به­دست آمد. میزان جذب نور به­ازای هر مرکز واکنش (ABS/RC) در رقم "ایمپرود" با 100 درصد نور آبی، ترکیبی از 15 درصد آبی+65 درصد قرمز+20 درصد سفید و شاهد بیشتر از سایر تیمارها بود. از آنجا که PIABS می­تواند به عنوان شاخص زندگی PSII استفاده شود، نتایج حاصل از پژوهش حاضر حاکی از آن است که تیمارهای شاهد ("ولوت رد")، 30 درصد آبی+70 درصد قرمز ("رد")، 30 درصد آبی+50 درصد قرمز+20 درصد سفید (ارقام "بلک دراگون" و "ایمپرود")، تیمارهای مناسبی برای پشتیبانی از عملکرد طبیعی فتوسنتز بودند. 

کلیدواژه‌ها

عنوان مقاله [English]

Effect of different light spectra on growth characteristics and photosynthesis yield of four ‎cultivars of coleus (Solenostemon scutellarioides L.)‎

نویسندگان [English]

  • Davood Kazemi 1
  • Maryam Dehestani Ardakani 2

1 M.Sc. Student, Faculty of Agriculture & Natural Resources, Ardakan University, P.O. Box 184, Ardakan, ‎Iran

2 Assosiate Professor, Faculty of Agriculture & Natural Resources, Ardakan University, P.O. Box 184, Ardakan, Iran

چکیده [English]

In order to investigate the effect of different light spectra on growth and photosynthetic properties of four cultivars (‘Red’, ‘Black Dragon’, ‘Velvet Red’ and ‘Improd’) of coleus, in six growth chambers equipped with normal greenhouse light (control), 100 % blue light, 15 % blue light+85 %red light, 30 % blue light+ 70 % red light, 15 % Blue light+65 % red light+20 % white light and 30 % blue light+50 % red light+20 % white light, a factorial experiment as a completely randomized design was done. After five weeks of exposure of plants to different lights, photosynthetic biophysical parameters and plant growth characteristics were investigated. The maximum quantum yield of PSII (FV/FM) and relative maximal variable fluorescence (Fm/F0), significantly increased in combined treatments of 30 % blue+70 % red (‘Red’), control (cultivars ‘Black Dragon’and ‘Velvet Red’) and a combination of 30 % blue+50 % red+20 % white (‘Improd’ cultivar) was obtained. The specific energy fluxes per reaction center for energy absorption (ABS/RC) significantly increased in ‘Improd’ cultivar with 100 %blue light, a combination of 15% blue+65% red+20 % white and control treatments. Since PIABS can be used as an indicator of PSII life, the results of the present study indicate that the control treatments (‘Velvet Red’), 30% blue+70 % red (‘Red’), 30 % blue+50 % red+20 % white (‘Black Dragon’ and ‘Improd’) were suitable treatments to support the natural function of photosynthesis.

کلیدواژه‌ها [English]

  • Leaf chlorophyll fluorescence
  • light quality
  • light spectra
  • morphology‎
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