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首页> 外文期刊>Pedobiologia >Phenology, morphology, aboveground biomass and root-associated soil respiration of Arabidopsis thaliana down-regulated cell wall mutants of MYB75, KNAT7, and CCR1
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Phenology, morphology, aboveground biomass and root-associated soil respiration of Arabidopsis thaliana down-regulated cell wall mutants of MYB75, KNAT7, and CCR1

机译：拟南芥下调MYB75，KNAT7和CCR1细胞壁突变体的物候，形态，地上生物量和根系土壤呼吸

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The growth pattern (phenology), resource allocation (morphology) and biomass accumulation of plant above-ground components is expected to have a feedback on root-associated processes in soil like water uptake, nutrient cycling and gas production. The aim was to see how above-ground plant characteristics (phenology, morphology and biomass) would impact water depletion, mineral nitrogen (N) concentration and carbon dioxide (CO_2-C) and nitrous oxide (N_2O-N) production from root-associated soil of Arabidopsis thaliana lines (wild ecotypes and down regulated mutants of MYB75, KNAT7 and CCR1 having altered lignin concentration in secondary cell walls) at various plant developmental stages. Phenology and morphology were determined on A. thaliana lines grown to maturity in peat moss-based substrate under controlled conditions. Plant biomass, water use, soil mineral N concentration and root-associated soil respiration were measured at various growth stages of A. thaliana lines grown in un-drained plastic pots containing clay-loam soil. The CCR1 mutant line had delayed maturation. While MYB75 and KNAT7 had similar morphology as the wild ecotype, the CCR1 line had fewer and smaller viable fruits, less crown cover of rosette leaves and lower biomass than the wild ecotype. The CCR1 mutant line had lower evapotranspiration than the wild ecotype. Respiration of root-associated soil planted with MYB75 and KNAT7 was similar to the wild ecotype. Higher N_2O production from soil planted with CCR1 was attributed to higher soil moisture content and mineral N concentration of bulk and rhizosphere soil than the wild ecotype. Morphology and biomass exerts strong influence on water content, mineral N concentration and soil respiration. Due to prolonged vegetative growth phase, reduced fecundity and biomass, the CCR1 mutant lowered evapotranspiration and left more mineral N in root-associated soils, which explained the higher N_2O emission from soil during its growth and development.
机译：地上植物的生长模式（物候学），资源分配（形态）和生物量积累预计将对土壤中与根相关的过程（如水分吸收，养分循环和产气）产生反馈。目的是了解地上植物的特性（物候，形态和生物量）如何影响根系相关水分的消耗，矿质氮（N）的浓度以及二氧化碳（CO_2-C）和一氧化二氮（N_2O-N）的产生不同植物发育阶段的拟南芥品系土壤（野生型和MYB75，KNAT7和CCR1的下调突变体，木质素在次级细胞壁中的浓度发生了变化）。在可控条件下，在基于泥炭藓的基质中生长至成熟的拟南芥品系上确定物候和形态。在不排水的塑料壤土盆中生长的拟南芥品系的不同生长阶段，测量了植物生物量，水分利用，土壤矿质氮浓度和根系相关的土壤呼吸。 CCR1突变株已延迟成熟。尽管MYB75和KNAT7的形态与野生生态型相似，但CCR1品系的果实却比野生生态型越来越少，花冠叶的冠冠较少，生物量也较低。 CCR1突变体的蒸散量低于野生生态型。种植MYB75和KNAT7的根系相关土壤的呼吸作用与野生生态型相似。与野生生态型相比，CCR1种植的土壤产生的N_2O较高，归因于块状和根际土壤的水分含量和矿质N浓度较高。形态和生物量对水含量，矿质氮含量和土壤呼吸影响很大。由于营养生长期延长，繁殖力和生物量减少，CCR1突变体降低了蒸散作用，并在根系相关土壤中留下了更多的矿质氮，这说明了土壤在生长和发育过程中排放的N_2O较高。

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