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Carbon and nitrogen allocation and partitioning in traditional and modern wheat genotypes under pre‐industrial and future CO 2 conditions
Author(s) -
Aljazairi S.,
Arias C.,
Nogués S.
Publication year - 2015
Publication title -
plant biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.871
H-Index - 87
eISSN - 1438-8677
pISSN - 1435-8603
DOI - 10.1111/plb.12280
Subject(s) - biology , labelling , anthesis , photosynthesis , cultivar , shoot , genotype , nitrogen , seedling , carbon fibers , nutrient , botany , horticulture , agronomy , ecology , gene , chemistry , biochemistry , materials science , organic chemistry , composite number , composite material
The results of a simultaneous 13 C and 15 N labelling experiment with two different durum wheat cultivars, Blanqueta (a traditional wheat) and Sula (modern), are presented. Plants were grown from the seedling stage in three fully controllable plant growth chambers for one growing season and at three different CO 2 levels ( i.e . 260, 400 and 700 ppm). Short‐term isotopic labelling (ca. 3 days) was performed at the anthesis stage using 13 CO 2 supplied with the chamber air and 15 NH 4 ‐ 15 NO 3 applied with the nutrient solution, thereby making it possible to track the allocation and partitioning of 13 C and 15 N in the different plant organs. We found that photosynthesis was up‐regulated at pre‐industrial CO 2 levels, whereas down‐regulation occurred under future CO 2 conditions. 13 C labelling revealed that at pre‐industrial CO 2 carbon investment by plants was higher in shoots, whereas at future CO 2 levels more C was invested in roots. Furthermore, the modern genotype invested more C in spikes than did the traditional genotype, which in turn invested more in non‐reproductive shoot tissue. 15 N labelling revealed that the modern genotype was better adapted to assimilating N at higher CO 2 levels, whereas the traditional genotype was able to assimilate N more efficiently at lower CO 2 levels.