نویسندگان

1 مربی، گروه زراعت و اصلاح نباتات، دانشکده کشاورزی، دانشگاه آزاد اسلامی واحد نراق، نراق

2 دانشیار، گروه زراعت و اصلاح نباتات، دانشکده کشاورزی، دانشگاه شهرکرد، شهرکرد

3 استادیار، گروه زراعت و اصلاح نباتات، دانشکده کشاورزی، دانشگاه شهرکرد، شهرکرد

چکیده

این مطالعه به منظور تعیین اثرات اندازه و فراوانی روزنه بر سرعت فتوسنتز، هدایت روزنه ای، عملکرد و همچنین تعیین مکان کروموزومی ژن های کنترل کننده این خصوصیات با استفاده از لاین های جایگزین کروموزومی رقم تایمستین در زمینه ژنتیکی رقم چاینیز اسپرینگ در قالب طرح بلوک های کامل تصادفی با سه تکرار در دو شرایط نرمال و تنش آب در مزرعه تحقیقاتی دانشکده کشاورزی، دانشگاه شهرکرد در سال 1387 انجام شد. شرایط مرحله طویل شدن ساقه (مرحله 29 زادکس) شروع شد. طول مدت تنش براساس درجه روز رشد مشخص شده در آزمایشات قبلی تعیین شد. تفاوت های معنی داری بین لاین های جایگزین در خصوص صفات مورد بررسی مشاهده شد. در شرایط بدون تنش، همبستگی عملکرد با فراوانی روزنه (**461/0 = r) و در شرایط تنش، همبستگی عملکرد و اندازه روزنه (**450/0 = r) معنی دار بود. همچنین، همبستگی عملکرد با سرعت فتوسنتز (**556/0 =r در شرایط تنش و **482/0 =r در شرایط بدون تنش) و هدایت روزنه ای (**247/0 =r در شرایط تنش و **457/0 =r در شرایط بدون تنش) هم در شرایط تنش و هم در شرایط بدون تنش معنی دار بود. بررسی کروموزوم‌های گندم نشان داد نقش ژنوم B نسبت به دو گروه دیگر در کنترل صفات مورد بررسی برجسته تر بود.

کلیدواژه‌ها

عنوان مقاله [English]

Effect of stomatal characteristics on photosynthesis and yield of the bread wheat chromosomal substitution lines under normal and stress conditions

نویسندگان [English]

  • Roghayeh Aminian 1
  • Shahram Mohammadi deh cheshme 2
  • Saadollah Houshmand 3
  • Mahmoud Khodambashi 2
  • Karim Nozad 1

چکیده [English]

This study was conducted to determine the effects of stomatal size and frequency on stomatal conductance, photosynthesis rate and yield, and to locate the genes controlling these traits. Therefore, substitution lines series of ‘Timstein’ (Tim) into genetic background of ‘Chinese Spring’ (CS) were tested in a completely randomized block design with three replications under two normal and water stress conditions in Shahrekord University research farm. Stress condition was started at elongation stage and irrigation periods were scheduled based on pre-determined ‘Growth Degree Day’ (GDD) during the length of stress period. Significant differences were found among substitution lines in terms of stomatal frequency, stomatal size, stomatal conductance, photosynthetic rate and yield. The significant correlation was found between the yield with stomatal size (r = 0.450**) and stomatal frequency (r = 0.461**) in stress and non-stress condition, respectively. In addition, there were significant correlation between yield with photosynthetic rate (r = 0.556** in stress condition and r = 0.482** in non-stress condition) and stomatal conductance (r = 0.247** in stress condition and r = 0.457** in non-stress condition). Based on the obtained results, it can be concluded that role of group B chromosomes was more prominent than the other two groups.

کلیدواژه‌ها [English]

  • Photosynthetic rate
  • Stomatal conductance
  • Stomatal Frequency
  • Stomatal size
  • Substitution lines
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