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Impact of defoliation frequency on regrowth and carbohydrate metabolism in contrasting varieties of Lolium perenne
- Source :
- Functional Plant Biology, Functional Plant Biology, CSIRO Publishing, 2007, 34, pp.418-430. ⟨10.1071/FP06286⟩
- Publication Year :
- 2007
- Publisher :
- CSIRO Publishing, 2007.
-
Abstract
- International audience; The aims of the study were to gain a better understanding of fructan metabolism regulation during regrowth of Lolium perenne, and to evaluate the role of fructans of remaining tissues as well as carbon assimilation of new leaf tissues in refoliation. Two varieties that contrast for carbohydrate metabolism, Aurora and Perma, were subject to severe and frequent or infrequent defoliations before regrowth. Aurora, which had a greater content of fructans in leaf sheaths than Perma before defoliation, produced more leaf biomass within the 4 days following the. first cut. At the end of the regrowth period, Aurora produced more leaf biomass than Perma. Photosynthetic parameters, which were barely affected by defoliation frequency, could not explain these differences. Fructan synthesising activities [sucrose: sucrose 1-fructosyltransferase (1-SST) and fructan: fructan 6G-fructosyltransferase (6G-FFT)], declined after defoliation. In elongating leaf bases, corresponding transcript levels did not decline concomitantly, suggesting a post-transcriptional regulation of expression, while in leaf sheaths the gene expression pattern mostly followed the time-course of the enzyme activities. Regulation of Lp1-SST and Lp6G-FFT gene expression depends, therefore, on the sink-source status of the tissue after defoliation. During the phase of reserve accumulation, fructosyltransferase activities together with corresponding transcripts increased more in frequently defoliated plants than in infrequently defoliated plants.
- Subjects :
- 0106 biological sciences
Ecophysiology
GENE EXPRESSION
Sucrose
CARBON ASSIMILATION
Plant Science
Carbohydrate metabolism
Photosynthesis
01 natural sciences
Lolium perenne
03 medical and health sciences
chemistry.chemical_compound
Fructan
[SDV.BV]Life Sciences [q-bio]/Vegetal Biology
DEFOLIATION
030304 developmental biology
0303 health sciences
Biomass (ecology)
RAY GRASS ANGLAIS
biology
fungi
food and beverages
ECOPHYSIOLOGIE
biology.organism_classification
FRUCTANS
Agronomy
chemistry
Agronomy and Crop Science
Developmental biology
010606 plant biology & botany
Subjects
Details
- ISSN :
- 14454408
- Volume :
- 34
- Database :
- OpenAIRE
- Journal :
- Functional Plant Biology
- Accession number :
- edsair.doi.dedup.....e5efa6fb569c2a0b86cf04baba602388