کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4509905 1624687 2015 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Post-flowering photoperiod and radiation interaction in soybean yield determination: Direct and indirect photoperiodic effects
ترجمه فارسی عنوان
تعامل فتوتراپی پس از گلدهی و تعامل تابش در تعیین عملکرد محصول: اثرات نور مستقیم و غیر مستقیم
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم زراعت و اصلاح نباتات
چکیده انگلیسی


• Radiation and photoperiod interact to determine soybean yield.
• Long days increase pods and seeds per m2 by increasing nodes per m2.
• A model to discriminate direct and indirect photoperiod effects on yield is proposed.
• Long days have both direct and indirect effects on nodes per m2.

Soybean (Glycine max (L.) Merrill) exposure to long days during the post-flowering phase increases total biomass, nodes, pods and seeds per plant, and also the post-flowering duration, increasing the radiation offer. This work aims to identify the main mechanisms responsible for yield increases in response to long days, separating direct photoperiodic effects on yield determination, from the indirect effect associated with changes in cumulative radiation when the crop cycle is modified by photoperiod. Two field experiments were conducted with an indeterminate soybean cultivar. A factorial combination of two radiation levels (unshaded and shaded), and two or three photoperiod regimes (control, extended 1.5 and 3 h) was imposed from flowering to maturity. Yield tended to be reduced by shade and increased by extended photoperiod mainly through their effects on nodes per m2, and thereby affecting pods and seeds per m2. Photoperiod extension increased node number due to both increased cumulative radiation (indirect effect) and delayed reproductive development (direct effect). As a result, more pods were established per unit of cumulative radiation under extended photoperiod. The results suggest that photoperiod extension enhanced yield radiation use efficiency due to the alleviation of intra-nodal interferences. The direct post-flowering photoperiodic effect on node number and the resultant effects on pod and seed number, provide evidence of direct photoperiodic effects on soybean yield determination.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Field Crops Research - Volume 176, May 2015, Pages 45–55
نویسندگان
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