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. 1997 Jan;135(1):41-50.
doi: 10.1046/j.1469-8137.1997.00631.x.

A stay-green mutation of Lolium perenne affects NO3 - uptake and translocation of N during prolonged N starvation

Anne Kjersti Barken  1 , James Macduff  2 , Mervyn Humphreys  2 , Neil Raistrick  2
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Free article

A stay-green mutation of Lolium perenne affects NO3 - uptake and translocation of N during prolonged N starvation

Anne Kjersti Barken et al. New Phytol. 1997 Jan.
Free article

Abstract

Apparent Km and Vmax for net NOS″ uptake and short-term translocation patterns of recently absorbed N were compared in a stay-green mutant and wild-type selection line of Lolium perenne L. by means of a series of depletion studies using 18 NO3 , performed over 12 d under conditions of progressively increasing N deprivation. In view of the greater retention of N in senescent leaves of the stay-green phenotype, it was predicted that NOS″ uptake would be up-regulated relative to the normal line, and that a proportionally higher fraction of recently absorbed N would be allocated to young leaves. It was shown that the stay-green trait had significant phenotypic consequences for plant N relations, with higher 'sink strength' of shoots for recently absorbed N, and higher Vmax for NO3 uptake compared with those of normal plants. The stay-green mutation had no effect on the Km of the nitrate uptake system. Although the N-use efficiency might he expected to be lower in stay-green than in normal plants, there were no differences in rates of dry matter production.

Keywords: Lolium perenne L.; N starvation; N translocation; nitrate uptake; stay-green.

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