ارزیابی شاخص های تحمل به خشکی و همبستگی بین آنها در لاین های چغندرقند

نوع مقاله: کامل علمی - پژوهشی

نویسندگان

استادیار مؤسسه تحقیقات اصلاح و تهیه بذر چغندرقند، سازمان تحقیقات، آموزش و ترویج کشاورزی، ایران

چکیده

در بهار سال 1391، به منظور تعیین بهترین شاخصهای کمی تحمل به خشکی در ژنوتیپهای چغندرقند، آزمایشی بهصورت طرحکرتهای خرد شده در قالب بلوکهای کامل تصادفی در سه تکرار در ایستگاه تحقیقاتی مرحوم مطهری مؤسسه تحقیقات چغندرقند درکمالشهر کرجانجام گرفت. دو تیمار آبیاری شامل آبیاری نرمال پس از 90-80 میلیمتر و آبیاری با اعمال تنش پس از 270 میلیمتر تبخیر از تشتکتبخیر کلاس A در کرتهای اصلی و 36 ژنوتیپ چغندرقند در کرتهای فرعی قرار داده شدند. شاخصهای حساسیت به تنش (SSI)، میانگین هارمونیک (Harm)، تحمل (TOL)، بهرهوری متوسط (MP)، پایداری عملکرد (YSI)، واکنش نسبت به خشکی (DRI)، تحمل تنش (STI)، میانگین هندسی بهرهوری (GMP)، عملکرد (YI)، مقاومت به خشکی (DI)، تحمل به تنش تغییر یافته (MSTI)، میزان محصول محیط غیرتنش و تنش(SNPI)، تحمل به تنشهای غیر-زیستی (ATI)، درصد حساسیت به تنش (SSPI)، و کاهش نسبی عملکرد (RDY) تعیین گردیدند. بر پایه دستورالعمل فرناندز، هشت ژنوتیپ‌ 3، 35، 32، 5، 34، 13، 26 و 36 جزو گروه A (عملکرد بالا در شرایط نرمال و تنش) قرار گرفتند. مقایسه 16 شاخص‌ مختلف تحمل نیز نشان داد که هفت شاخص‌ GMP، Harm و MSTI (بر مبنای K2STISNPI، STI،YI و YS توانستند هشت ژنوتیپ متعلق به گروه A را به‌درستی تشخیص دهند. اگرچه، مطالعه ضرایب همبستگی بین شاخص‌های تحمل و عملکرد شکرخام در شرایط نرمال و تنش حاکی از برتری شاخص‌هایSSPI،ATI، MP، TOL، GMP، STI، RDY، Harm،YI،SNPI و DI بود.

کلیدواژه‌ها


عنوان مقاله [English]

Evaluation of drought tolerance indices and their correlations in sugar beet lines

نویسندگان [English]

  • Saeed Sadeghzadeh Hemayati
  • F. Fasahat
Assistant Professor of Sugar Beet Seed Institute (SBSI)- Agricultural Research Education and Extension Organization (AREEO), Iran.
چکیده [English]

Current study aimed at determining the most reliable drought tolerant criteria for identification of sugar beet genotypes. A split plot design based on randomized complete block design with three replications was applied at Motahari Research Station, Karaj, Iran in 2012. Two irrigation treatments including normal irrigation after 80-90 mm and irrigation after 270 mm evaporation (stress condition) from class A evaporation pan were allocated to main plots and 36 sugar beet genotypes to sub-plots. Stress susceptibility index (SSI), harmonic mean (Harm), tolerance (TOL), mean productivity (MP), yield stability (YSI), drought response (DRI), stress tolerance (STI), geometric mean productivity (GMP), yield index (YI), drought resistance (DI), modified stress tolerance (MSTI), stress non-stress production (SNPI), abiotic tolerance index (ATI), stress susceptibility percentage (SSPI), relative decrease in yield (RDY) indices were estimated. According to the abovementioned criteria, genotypes 3, 35, 32, 5, 34, 13, 26, and 36 with high yield under both normal and stress conditions were ranked in group A. Comparison of the 16 indices showed that GMP, Harm, MSTI (based on K2STI), SNPI, STI, YI and YS indices could identify the group A genotypes accurately. However, the results of correlation coefficient between drought tolerance indices and raw sugar yield under normal and stress conditions showed the indices SSPI, ATI, MP, TOL, GMP, STI, RDY, Harm, YI, SNPI and DI as superior criteria.

کلیدواژه‌ها [English]

  • drought tolerance indices
  • Efficiency
  • genotype
  • sugar beet
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