首页|The maize low-lignin brown midrib3 mutant shows pleiotropic effects on photosynthetic and cell wall metabolisms in response to chilling

The maize low-lignin brown midrib3 mutant shows pleiotropic effects on photosynthetic and cell wall metabolisms in response to chilling

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  • NSTL
  • Elsevier
Maize (Zea mays L.) is one of the major cereal crops in the world and is highly sensitive to low temperature. Here, changes in photosynthetic and cell wall metabolisms were investigated during a long chilling exposure in inbred line F2 and a low-lignin near-isogenic brown midrib3 mutant (F2bm3), which has a mutation in the caffeic acid Omethyltransferase (COMT) gene. Results revealed that the plant biomass was reduced, and this was more pronounced in F2bm3. Photosynthesis was altered in both lines with distinct changes in photosynthetic pigment content between F2bm3 and F2, indicating an alternative photoprotection mechanism between lines under chilling. Starch remobilization was observed in F2bm3 while concentrations of sucrose, fructose and starch increased in F2, suggesting a reduced sugar partitioning in F2. The cell wall was altered upon chilling, resulting in changes in the composition of glucuronorabinoxylan and a reduced cellulose level in F2. Chilling shifted lignin subunit composition in F2bm3 mutant to a higher proportion of p-hydroxyphenyl (H) units, whereas it resulted in lignin with a higher proportion of syringyl (S) residues in F2. On average, the total cell wall ferulic acid (FA) content increased in both genotypes, with an increase in ether-linked FA in F2bm3, suggesting a greater degree of cross-linking to lignin. The reinforcement of the cell wall with lignin enriched in H-units and a higher concentration in cell-wall-bound FA observed in F2bm3 as a response to chilling, could be a strategy to protect the photosystems.

bm3Caffeic acidO-MethyltransferasePhotosynthetic pigmentsNon-structural sugarsHydroxycinnamic acidZea mays LMISCANTHUS X GIGANTEUSZEA-MAYSLOW-TEMPERATUREBIOMASS RECALCITRANCEREDUCES RECALCITRANCEETHANOL-PRODUCTIONCOLD-TOLERANCESOLUBLE SUGARSBM3 MUTATIONFERULIC ACID

Garzon, Catalina Duran、Lequart, Michelle、Charras, Quentin、Fournet, Francoise、Bellenger, Leo、Sellier-Richard, Helene、Giauffret, Catherine、Vermerris, Wilfred、Domon, Jean-Marc、Rayon, Catherine

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Univ Picardie Jules Verne

Aix Marseille Univ

Transfrontaliere BioEcoAgro

AgroImpact

Univ Florida

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2022

10.1016/j.plaphy.2022.05.006

Plant Physiology and Biochemistry

Plant Physiology and Biochemistry

SCI
ISSN：0981-9428
年,卷(期)：2022.184
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