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Partitioning and Remobilization of Nitrogen during Regrowth in Nitrogen-Deficient Ryegrass

Laboratoire de Physiologie et de Biochemie Végétales. Inst. de Recherches en Biologie Appliquéé, Université, 14032 Caen Cedex, France

J. Salette

Dép. d'Agronomie, INRA, Centre Recherches d'Angers, Beaucouzé, F,49000 Angers, France

^* Corresponding author.

Little is known about the relative importance of different sources of N during crop regrowth after defoliation. This study was conducted to determine the effect of N deficiency on N uptake and redistribution throughout plants during a 14-d period of regrowth following cutting in ryegrass (Lolium perenne L.). Eight-week-old plants grown in hydroponic culture, were labeled for 5 d with ¹⁵N prior to cutting treatment. Regrowth occurred during 14 d with a low or high N supply in the growth medium and ¹⁵N amounts recovered in plants were used to estimate both N uptake from the medium and N remobilization from roots and stubble to regrowing leaves. Comparison of clipped plants regrowing under nonlimited and limited N conditions showed that N deficiency reduces the growth of leaves. Nitrogen starvation decreases N uptake from the medium and protein N remobilization of roots, while N remobilization from stubble remains unaffected. After 14 d on N-starved medium, about 69% of N in new regrowing leaves was obtained from endogenous compounds accumulated in roots and stubble, while only 40% was remobilized from these tissues in plants grown on a nonlimited N medium. Consequently, there is an important deficit between net N outflow and net N inflow, particularly in stubble of N limited plants. The overall results demonstrated that stubble tissues contribute to remobilization of N compounds during regrowth after defoliation in proportion to the level of N deficiency in the medium, while remobilization of protein N of roots was decreased with a low supply of N in the medium.

Received for publication October 2, 1989.

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