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- Title
Exploring nitrogen remobilization for seed filling using natural variation in Arabidopsis thaliana.
- Authors
Masclaux-Daubresse, Céline; Chardon, Fabien
- Abstract
Nineteen Arabidopsis accessions grown at low (LOW N) and high (HIGH N) nitrate supplies were labelled using 15N to trace nitrogen remobilization to the seeds. Effects of genotype and nutrition were examined. Nitrate availability affected biomass and yield, and highly modified the nitrogen concentration in the dry remains. Surprisingly, variations of one-seed dry weight (DW1S) and harvest index (HI) were poorly affected by nutrition. Nitrogen harvest index (NHI) was highly correlated with HI and showed that nitrogen use efficiency (NUE) was increased at LOW N. Nitrogen remobilization efficiency (NRE), as 15N partitioning in seeds (15NHI), was also higher at LOW N. The relative specific abundance (RSA) in seeds and whole plants indicated that the 14NO3 absorbed post-labelling was mainly allocated to the seeds (SEEDS) at LOW N, but to the dry remains (DR) at HIGH N. Nitrogen concentration (N%) in the DR was then 4-fold higher at HIGH N compared with LOW N, whilst N% in seeds was poorly modified. Although NHI and 15NHI were highly correlated to HI, significant variations in NUE and NRE were identified using normalization to HI. New insights provided in this report are helpful for the comprehension of NUE and NRE concepts in Arabidopsis as well as in crops and especially in Brassica napus.
- Subjects
ARABIDOPSIS thaliana; NITROGEN fertilizers; NITROGEN in agriculture; SEEDS; EXPERIMENTAL botany
- Publication
Journal of Experimental Botany, 2011, Vol 62, Issue 6, p2131
- ISSN
0022-0957
- Publication type
Article
- DOI
10.1093/jxb/erq405