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GrainGenes Reference Report: ANB-89-11

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Reference	ANB-89-11
Title	Effects of a stay-green mutation on plant nitrogen relations in Lolium perenne during N starvation and after defoliation
Journal	Annals of Botany
Year	2002
Volume	89
Pages	11-21
Author	MacDuff JH Humphreys MO Thomas H
Abstract	Summary: The stay-green mutation of the nuclear gene sid results in inhibition of chlorophyll degradation during leaf senescence in grasses, reducing N remobilization from senescing leaves. Effects on growth of Lolium perenne L. were investigated during N starvation (over 18 d) and after severe defoliation, when leaf growth depends on the remobilization of internal N. Rates of dry matter production, partitioning between shoots and roots, and re-partitioning of N from shoots to roots were very similar in stay-green and normal plants under N starvation. Km and Vmax for net uptake of NH4+ were also similar for both genotypes, and Vmax increased with the duration of N deprivation. The mutation had little effect on recovery of leaf growth following severe defoliation, but stay-green plants recommenced NO3(-) and K(+) uptake 1 d later than normal plants. Import of remobilized N into new leaves was generally similar in both lines. However, stay-green plants remobilized less N from stubble compared with normal plants. It was concluded that the sid locus stay-green mutation has no significant adverse effect on the growth of L. perenne during N starvation, or recovery from severe defoliation when plants are grown under an optimal regime of NO3(-) supply both before and after defoliation. The absence of any effect on leaf dry matter production implies that the difference in foliar N availability attributable to this mutation has little bearing on productivity, at least in the short to medium term
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