The effects of suboptimal environment temperatures during and immediately after germination on the morphology of root system in pea (Pisum sativum) plants
Seeds of three different pea genotypes were sown in styrofoam transplant trays filled with vermiculite and later placed in two different growth chambers, respectively at air temperatures of 10 and 15°C. In both chambers the relative humidity was maintained at 90%, PPFD 180 µmol m‑2 s‑1 and the photoperiod 12 h. At DAS 7 and 15, ten plant from each treatment were selected randomly, dissected and separated into roots and shoots. The root system was scanned and analyzed and subsequently, all plant organs were dried (65°C, 48 h) and weighted separately. The environment temperature affected the dry matter accumulation of newly emerged pea plants. Low temperature significantly reduced the overall plant dry matter, but it favored a higher proportion of root dry matter versus the total plant matter. However, depending less on environment temperature, root to whole plant ratio gradually decreased alongside plant growth. The morphology of root system was also highly influenced by the environment temperature. Under suboptimal environmental temperatures, the root system of pea plants is less branched, i.e., the number of tips and forks was significantly reduced. Total root length, root projected area, root surface area and root volume were significantly smaller as well, while the average root diameter was strongly increased. Significant differences regarding root morphology parameters were also found among different genotypes.
Sallaku, G. and Balliu, A. (2021). The effects of suboptimal environment temperatures during and immediately after germination on the morphology of root system in pea (Pisum sativum) plants. Acta Hortic. 1326, 287-294
dry matter, relative growth rate, root length, root surface area, root volume