Estimation of Leaf Area in Coneflower (Echinacea purpurea L.) Using Independent Variables

محورهای موضوعی : مجله گیاهان زینتی

Mohammad Hossein Aminifard ¹ (Department of Horticultural Science, College of Agriculture, University of Birjand, Birjand, Iran)
Mahdi Khayyat ² (Department of Horticultural Science, College of Agriculture, University of Birjand, Birjand, Iran)
Hassan Bayat ³ (Department of Horticultural Science, College of Agriculture, University of Birjand, Birjand, Iran)

تاریخ دریافت : 1394/12/17 تاریخ پذیرش : 1395/03/04 تاریخ انتشار : 1395/09/11

کلید واژه: Leaf length, Leaf width, Linear model, Non-destructive methods,

چکیده مقاله :

Leaf area information is required in various horticultural and physiological studies and it will be more useful if done via non-destructive methods. The objective of this study was to establish equations to estimate leaf area (LA) using length (L), width (W), fresh weight (FW), dry weight (DW), length × length (L2), width × width (W2), length × width (L×W), length + width (L+W), fresh weight × fresh weight (FW2) and dry weight × dry weight (DW2) of coneflower (Echinacea purpurea L.) leaves as a medicinal and landscape plant. An open field experiment was carried out to study relationship between leaf dimension and weight with leaf area of this plant. Observed leaf area was obtained by an automatic measuring device and leaf dimensions were measured by a ruler. A linear model employing L × W as an independent variables [LA = 0.575 (L × W) - 0.934] resulted in the most accurate estimation (R2 = 0.874, RMSE = 2.33) of coneflower leaf area. Validation of the regression model showed that the correlation between measured and simulated values by using this equation was quite acceptable.

چکیده انگلیسی:

سطح برگ یک متغیر کلیدی برای مطالعات فیزیولوژیکی است، بنابراین مدل­های دقیـق و سـاده­ای کـه بتواننـد سـطح بـرگ گیاهان را تعیین کنند در موارد زیادی اهمیت دارند. هدف از این تحقیق تعیین معادله­هایی برای تخمین سطح برگ گیاه با استفاده از طول (L)، عرض (W)، وزن تر (FW)، وزن خشک (DW)، طول × طول، عرض × عرض، طول × عرض، طول + عرض، وزن تر × وزن تر و وزن خشک × وزن خشک برگ­های گیاه سرخارگل (Echinaceapurpurea L.) به عنوان گیاه زینتی دارویی بود. بدین منظور آزمایشی در شرایط مزرعه برای بررسی رابطه بین ابعاد و وزن برگ با سطح برگ انجام شد. سطح برگ گیاه با استفاده از دستگاه اندازه­گیری اتوماتیک و ابعاد برگ با خط کش اندازه گیری شدند. مدل خطی با استفاده از طول × عرض (L×W) به عنوان متغیرهای مستقل [LA = 0.575 (L × W) - 0.934] از دقیق­ترین تخمین (R2 = 0.874, RMSE = 2.33) یرای تعیین سطح برگ گیاه سرخارگل بدست آمد. تایید مدل رگرسیونی نشان داد که همبستگی داده­های اندازه­گیری شده با داده­های تخمینی توسط معادله کاملا قابل قبول بود. 

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