Abstract Seeds of ten different pea genotypes were sown in styrofoam transplant trays filled with vermiculite and kept in two different growth chambers, respectively at air temperatures of 10 °C and 15 °C. In both chambers the relative humidity was maintained at 90%, PPFD 180 μmol m−2 s−1and the photoperiod 12 h. At DAS 15 and 31, ten plant of each treatment were selected randomly, dissected and separated into roots and shoots. Root system was scanned and acquired root images were analyzed. Subsequently, all plant organs were dried (65 °C, 48 h) and weighed separately. Significant genetic variation was identified regarding root traits. Rather than with the drought resistance and N foraging capability the genetic variation was associated with P foraging capability of the root system. Despite significant genotype differences, root traits were remarkably affected by environment temperature. The suboptimum temperature reduced growth and delayed root development processes. The decrease of temperature from 15 °C to 10 °C was followed by a significant decrease in the dry matter of plant, but the ratio of root dry matter to plant dry matter was significantly increased. The total root length was also significantly decreased, almost totally due to a significant decrease in the lateral root length. Only slight effects were found regarding tap root length. Water and nutrient uptake capabilities of pea plants were enhanced under optimum temperature conditions, mostly due to increased lateral root density and extended root branching zone deeper into the soil. Either the differences in lateral root (LR) density or the length of branching zone seems to be related with the effects of temperature to the length of development time from LR initiation to LR emergence.

中文翻译：

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环境温度影响豌豆 (Pisum sativum L) 植物的萌发后生长和根系结构

摘要 将十种不同基因型豌豆种子播种在填充有蛭石的泡沫聚苯乙烯移植托盘中，并分别保存在空气温度为 10 °C 和 15 °C 的两个不同生长室中。在两个室中，相对湿度保持在 90%，PPFD 180 μmol m-2 s-1 和光周期 12 小时。在DAS 15和31，每个处理随机选择10株植物，解剖并分离成根和芽。扫描根系统并分析获取的根图像。随后，将所有植物器官干燥（65°C，48 小时）并分别称重。在根性状方面发现了显着的遗传变异。与抗旱性和 N 觅食能力不同，遗传变异与根系的 P 觅食能力有关。尽管存在显着的基因型差异，根系性状受环境温度影响显着。次优温度降低了生长并延迟了根系发育过程。温度从 15 ℃降低到 10 ℃，植物干物质显着减少，但根干物质与植物干物质之比显着增加。总根长也显着减少，几乎完全是由于侧根长度的显着减少。对主根长度仅发现轻微影响。豌豆植物的水分和养分吸收能力在最佳温度条件下得到增强，这主要是由于侧根密度增加和根分枝区深入土壤。