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ارزیابی اثرات تنش خشکی آخر فصل بر عملکرد و برخی صفات ژنوتیپ های کلزای زمستانه | ||
| پژوهش های کاربردی زراعی | ||
| دوره 35، شماره 3 - شماره پیاپی 136، مرداد 1402، صفحه 66-46 اصل مقاله (752.83 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/aj.2023.355332.1555 | ||
| نویسندگان | ||
| الهه شادان* 1؛ حمید نجفی زرینی1؛ بهرام علیزاده2؛ غفار کیانی3؛ غلامعلی رنجبر4 | ||
| 1گروه اصلاح نباتات و بیوتکنولوژی، دانشگاه علوم کشاورزی و منابع طبیعی ساری. ایران | ||
| 2دانشیار موسسه تحقیقات اصلاح و تهیه نهال و بذر | ||
| 3دانشیار گروه اصلاح نباتات، دانشگاه علوم کشاورزی و منابع طبیعی ساری | ||
| 4گروه اصلاح نباتات و بیوتکنولوژی، دانشگاه علوم کشاورزی و منابع طبیعی ساری | ||
| چکیده | ||
| بهمنظور ارزیابی اثر تـنش خـشکی بـر صفات مورفو-فنولوژیک، فیزیولوژیک و زراعی و شناسـایی ژنوتیپهای متحمل به خشکی با عملکرد بالا، آزمایشی در موسسه تحقیقات اصلاح و تهیه نهال و بذر کرج به مدت دوسال زراعی (95-97) در شرایط آبیاری کامل و اعمال تنش خشکی آخر فصل (مرحله آغاز غلافدهی) بر روی برخی ژنوتیپهای جدید کلزا در قالب طرح بلوکهای کامل تصادفی با سـه تکـرار انجام شد. نتایج تجزیه مرکب نشان داد اثر خشکی بر اکثر صفات مـورد ارزیـابی بهغیر از روز تا پایان گلدهی، طول گلدهی و درصد روغن معنیدار بود. تنش خشکی سبب کاهش عملکرد دانه، اجزای عملکرد، ارتفاع بوته، کلروفیل a ، bو کاروتنوئیدها، محتوای نسبی آب برگ و تعداد روز تا رسیدگی شد، در حالی که عدد SPAD را افزایش داد. عملکرد دانه در اثر تنش خشکی به میزان 5/25درصد کاهش یافت. میانگین عملکرد در شرایط نرمال و تنش به ترتیب 4/3601 و 8/2681 کیلوگرم در هکتار بود. با انجام تجزیه عاملی در شرایط نرمال و تنش سه عامل شناسایی شدند که به ترتیب در مجموع 7/79 و 5/82 درصد تغییرات را توجیه کردند. عامل اول در شرایط نرمال و تنش به ترتیب 39 و 45 درصد تغییرات را توجیه کرد. بنابرنتایج تجزیه به مولفههای اصلی، رسم بایپلات و تجزیه خوشهای بر اساس این شاخصها، ژنوتیپهای، نفیس، Vesuvio، Medea، HL3721 و HL2012 به عنوان ژنوتیپهای متحمل به تنش خشکی آخر فصل با عملکرد بالا شناسایی شدند. از این ژنوتیپها میتوان در کرج و مناطقی که دارای شرایط اقیلمی مانند کرج هستند استفاده کرد | ||
| کلیدواژهها | ||
| بایپلات؛ تجزیه چند متغیره؛ صفات زراعی؛ صفات فیزیولوژیک؛ شاخصهای تحمل به تنش | ||
| عنوان مقاله [English] | ||
| Evaluation of the Effects of Terminal Drought Stress on yield and Some Traits of Winter Oilseed Rape Genotypes | ||
| نویسندگان [English] | ||
| Elahe Shadan1؛ hamid najafi zarini1؛ Bahram Alizadeh2؛ Ghaffar Kiani3؛ Gholamali Ranjbar4 | ||
| 1Department of Plant Breeding and Biotechnology, Sari Agricultural Sciences and Natural Resources University, Sari, Iran | ||
| 2Mahdasht Ave. Nahal-o-Bazr Township Oilseeds Research Department | ||
| 3Department of Plant Breeding, Sari Agricultural Sciences and Natural Resources University | ||
| 4Department of Plant Breeding and Biotechnology, Sari Agricultural Sciences and Natural Resources University, Sari, Iran | ||
| چکیده [English] | ||
| Introduction Rapeseed is a main oilseed crop in the world. Water deficiency is the main cause of reduced crop yield under drought stress. The highest rapeseed yield reduce was resulted when water deficit occurred at flowering and pod developmental stages (Kahrizi and Allahvarand, 2012). Knowing about the traits that affect grain yield, so that by improving these traits, grain yield can be increased, plays an important role for being successful breeding programs. Factor analysis of multivariate statistical methods is for a deeper understanding of the relationships between traits and is an effective statistical method in reducing data volume (Cooper, 1983). The aim of this study was to study the effect of late-season drought stress on some traits affecting the yield of studied rapeseed genotypes and to identify genotypes compatible with normal and drought stress conditions using some stress tolerance indices. Material and Methods This experiment was carried out at the research field of Seed and Plant Improvement Institute, Karaj, Iran, on 2016-2018 growing seasons under full irrigation conditions and late-season drought stress (from beginning pod setting stage) on new winter rapeseed genotypes in a randomized complete block design with three replications. Some of morphological, physiological, phenological traits, yield and yield components were measured. Factor analysis was performed to determine the most influential variables. To identify drought tolerance genotypes, drought tolerance indices such as tolerance index (TOL), stress susceptibility index (SSI), mean productivity (MP), geometric mean productivity (GMP), harmonic mean (HMP), stress tolerance index (STI), Yield index (YI), Sensitivity drought index (SDI) and yield stability index (YSI) were used. Results and Discussion The combined analysis of variance showed that the effect of drought stress on all evaluation traits was significant except for height of the first branch, days to end of flowering, flowering period and oil percentage. The results showed that drought stress decreased Grain yeald, Pods per plant, Seeds per pod, 1000 Seed weight, plant height, Chlorophyll a and b, Cartenoid, Relative water content and Days to maturity; while it increased Chlorophyll Index (SPAD). The results of factor analysis exhibited three factors in normal and drought stress conditions, which explained 79.7% and 82.51% of the variation, respectively. This factors in normal conditions were named "Yield", "Plant pigment", "Phenological traits" respectively, and in stress conditions were named " productivity", "Plant pigment" and " sink" , respectively. It seems that its seams possible to use these traits as selection criteria in breeding programs for improve grain yield of winter rapeseed genotypes results showed that GMP, MP, HMP and STI indices were positively correlated with grain yield under both stress and non-stress conditions. Therefore, they can be exploited not only to screen drought tolerance but also to identify superior genotypes for both stress and non-stress field conditions (Fernandez, 1992). Principal component analysis using grain yield under both conditions and drought tolerance indices showed that the genotypes Nafis, Vesuvio, Medea, HL3721 and HL2012 were the most tolerant genotypes to drought conditions, while the genotypes Extorm, Excalibur, Danube and Expower were the most sensitive genotypes. With cluster analysis using WARD procedure based on drought tolerance, the studied genotypes were grouped in 3 separate clusters. The first group consisted of genotypes that have high yield and drought tolerant and had appropriate and reliable values of indices such as STI, MP, GMP, HMP. Therefore, this group (genotypes Nafis, Vesuvio, Medea, HL3721 and HL2012) are drought tolerant group. The second group had genotypes with low values of STI, MP, GMP, HMP as well as Ys and Yp and higher values of SSI. Therefore, genotypes Danube, Excalibur, Expower, Harnus and Extorm with low yield and drought sensitivity were placed in this cluster. The next group (Okapi, Ahmadi, Nima, Natalie, SLM046, Artist) with average yield in both non-stress and stress conditions, and less sensitivity to drought stress condition, were stable in yield, and therefore considered as semi-resistant cultivars. | ||
| کلیدواژهها [English] | ||
| Bi-plot, Multivariate analysis, Agronomic traits, Physiological traits, Stress tolerance indices | ||
| مراجع | ||
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