کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4555742 1628111 2006 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Response of nodulated alfalfa to water supply, temperature and elevated CO2: productivity and water relations
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک بوم شناسی، تکامل، رفتار و سامانه شناسی
پیش نمایش صفحه اول مقاله
Response of nodulated alfalfa to water supply, temperature and elevated CO2: productivity and water relations
چکیده انگلیسی

Exposing plants to long-term CO2 enrichment generally leads to increases in plant biomass, total leaf area and alterations on leaf net photosynthetic rates, stomatal conductance and water use efficiency. However, the magnitude of such effects is dependent on the availability of other potentially limiting resources. The aim of our study was to elucidate the effects of elevated CO2, applied at different temperature and water availability regimes, on nodulated alfalfa plants. Regardless of water supply, elevated CO2 enhanced plant growth, especially when combined with increased temperature although no differences were detected until 30 days of treatment. Absence of differences in leaf relative growth rate, and gas exchange measurements, suggested that plants grown in a low water regime adjusted their growth to the amount of available water. Elevated CO2 enhanced water use efficiency because of reduced water consumption and a greater dry mass production. Increased dry matter production of plants grown under elevated CO2 and temperature was the result of stimulated photosynthetic rates, greater leaf area and water use efficiency. Lack of CO2 effect on photosynthesis of plants grown at ambient temperature might be consequence of down-regulation phenomena. Plants grown at 700 μmol mol−1 CO2 maintained control nitrogen levels, discarding enhanced nitrogen availability as the main factor explaining enhanced dry matter.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Environmental and Experimental Botany - Volume 55, Issues 1–2, January 2006, Pages 130–141
نویسندگان
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