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Defoliation affects the root competitive balance for N between poa annua plants grown in a split‐root box

Grassland Research 2022年第2期1卷 94-102页

作者： Sayuki Mori Louis John Irving School of Life and Environmental Sciences University of TsukubaTsukubaJapan

Background:Plants compete aboveground for light and belowground for patchily distributed nutrients.Defoliation causes an immediate loss of leaf area and photosynthetic capacity,leading to reduced root growth,with hypothesised implications for nutrient uptake and nitrogen use efficiency.Methods:In Experiment 1,we grew single plants in split root boxes with N supplied equally or unequally,with half the plants subject to repeated defoliation to quantify the impact of each treatment.In Experiment 2,we grew pairs of poa annua plants in three‐chamber split root boxes,with N supplied either to the outer chambers(no competition)or to a shared centre chamber(competition),to quantify the influence of defoliation on root competition.Results:In Experiment 1,defoliation caused a significant decrease in root mass but did not affect root distribution between chambers,while differential N supply led to an 11%increase in shoot mass.In Experiment 2,strong root competition was seen in undefoliated plants under competitive conditions.Where one plant was defoliated,the other exhibited increased shoot mass and N content in competitive,but not noncompetitive conditions.Conclusions:Our data suggest that plant belowground competitive success following defoliation may be strongly influenced by the spatial distribution of soil resources.

关键词： competition defoliation differential growth nitrogen nitrogen use efficiency poa annua root

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No difference in activity of Sod-1 genotypes of poa annua to short-term treatment of ambient gaseous organic pollution

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Journal of Environmental Sciences 2005年第5期17卷 866-868页

作者： CAI Yue-wei CHEN Xiao-yong Shanghai Key Laboratory for Ecological Processes and Restoration in Urban Areas Department of Environmental Sciences East China Normal University Shanghai 200062 China

Our previous studies indicated that genotypes at locus Sod-1 of poa annua changed clinally along a gradient of gaseous organic pollution. In the present study, we aimed to know whether there were differential responses of activities of different superoxide dismutase （SOD） genotypes to short-term treatment of ambient gaseous organic pollution. Significant bias from Hardy-Weinberg equibrium was observed on locus Sod-1, and no genotype Sod- l-BB was found. Significantly increased activities were observed in most treatments for genotype Sod-1-AA and in one treatment for genotype Sod-1-AB. However, no significant difference in SOD activities was found between the two genotypes. It was interpreted that fitness difference between the two genotypes was small and treatment duration was too short or extent of ambient organic pollution was too low to lead to differential responses. Other environmental factor effects on activities of superoxide dismutases can also explain the results.

关键词： superoxide dismutase genotype activity gaseous organic pollution poa annua

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