کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2055843 1075781 2014 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Short-term supply of elevated phosphate alters the belowground carbon allocation costs and functions of lupin cluster roots and nodules
ترجمه فارسی عنوان
تامین کوتاه مدت فسفات بالا باعث کاهش هزینه های تخصیص کربن زیر زمین و عملکرد ریشه ها و گره های خوشه لوپین می شود
کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم زراعت و اصلاح نباتات
چکیده انگلیسی

SummaryLupins can rely on both cluster roots and nodules for P acquisition and biological nitrogen fixation (BNF) respectively. The resource allocation (C, N and P) between cluster roots and nodules has been largely understudied during P-deficient conditions. The aim of this investigation was therefore to determine the changes in resource allocation between these organs during fluctuations in P supply. Lupinus albus was cultivated in sand culture for 3 weeks, with either sufficient (2 mM high) or limiting (0.1 mM low) P supply. Although variation on P supply had no effect on the total biomass, there were significant differences in specialised below-ground organ allocation to cluster roots and nodule formation. Cluster root formation and the associated C-costs increased during low P supply, but at sufficient P-supply the construction and growth respiration costs of cluster roots declined along with their growth. In contrast to the cluster root decline at high P supply, there was an increase in nodule growth allocation and corresponding C-costs. However, this was not associated with an increase in BNF. Since cluster roots were able to increase P acquisition under low P conditions, this below-ground investment may also have benefited the P nutrition of nodules. These findings provide evidence that when lupins acquire N via BNF in their nodules, there may be a trade-off in resource allocation between cluster roots and nodules.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Plant Physiology - Volume 171, Issue 8, 1 May 2014, Pages 648–654
نویسندگان
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