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Relationships between Nitrogen Utilization and Grain Technological Quality in Durum Wheat: I. Nitrogen Translocation and Nitrogen Use Efficiency for Protein
Author(s) -
Giuliani M. M.,
Giuzio L.,
De Caro A.,
Flagella Z.
Publication year - 2011
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj2011.0153
Subject(s) - agronomy , nitrogen , cultivar , chromosomal translocation , mediterranean climate , biology , irrigation , water use efficiency , water stress , grain quality , chemistry , ecology , biochemistry , organic chemistry , gene
Durum wheat ( Triticum durum Desf.) is widely cultivated in the Mediterranean area where plants generally suffer from water stress during grain‐filling period. This study was conducted to evaluate the influence of N levels and water regimes on N translocation and nitrogen use efficiency for protein (NUEP) in durum wheat grown under Mediterranean conditions. A 2‐yr experiment was performed in southern Italy using four cultivars, two water regimes (irrigated and rainfed) and three N levels (0, 60, and 120 kg ha −1 ). Among the cultivars under study, Simeto showed the highest N translocation in both years and, together with Ofanto, also the highest NUEP values, especially in rainfed condition. This highlights their good adaptability to dry southern Italy environment. Nitrogen fertilization caused a general decrease of NUEP and its components in both growing seasons; this was more evident in the first drier year, mainly due to a decrease in N uptake. Under water stress the higher N level caused a decrease in N translocation, N translocation efficiency, and grain N content. The contribution of translocated N to grain N content was 75% in the wetter year and 57% in the drier year, showing that in drought condition preanthesis N assimilation was lower. In conclusion under water stress condition the higher N level (120 kg ha −1 ), despite determining an increase in plant N content, did not imply an increase in grain N content, due to a decrease in N translocation and efficiency.