Changes in shoot and root biomass of the 36-day-old (A) and changes in leaf number and biomass of the 64-day-old (B) Tragopogon pratensis plants affected by sand burial in different depths. Data are expressed as per cent values relative to unburied control plants and are means ± SE from five individual replicates. Columns or symbols marked with the same letter for the particular parameter are not statistically significantly different (p < 0.05)

Contexts in source publication

Context 1

... burial resulted in a significant increase of shoot and root biomass for the 36-day-old T. pratensis plants irrespective of burial intensity. Still, the stimulative effect of shoot growth in 3 cm treatment was significantly higher than that of 2 cm treatment (Fig. 4A). When the experiment with the 64-day-old plants was terminated after 40 days of the beginning of treatment, it appeared that burial resulted in a significant reduction in the number of older and younger leaves to a similar extent (Fig. 4B). However, the fresh mass of both older and younger leaves increased at 3 cm burial depth, but ...

Context 2

... stimulative effect of shoot growth in 3 cm treatment was significantly higher than that of 2 cm treatment (Fig. 4A). When the experiment with the 64-day-old plants was terminated after 40 days of the beginning of treatment, it appeared that burial resulted in a significant reduction in the number of older and younger leaves to a similar extent (Fig. 4B). However, the fresh mass of both older and younger leaves increased at 3 cm burial depth, but only biomass accumulation of younger leaves was significantly stimulated with further increase in burial depth, but biomass of older leaves significantly decrease at 9 cm burial. The growth response of T. pratensis shoots due to burial was ...

Context 3

... responses to the moderate sand burial of the two species. Moderate burial intensity for the 36-day-old plants resulted in pronounced linearly increased shoot biomass accumulation in T. heterospermus with a tendency for decreased root growth (Fig. 2C). Still, in T. pratensis of the same age, both shoot and root growth were slightly stimulated (Fig. 4A). Moreover, while positive shoot growth response had a significant lag phase for the 64-day-old T. heterospermus plants (Fig. 1D), there was no such response regarding T. pratensis plants of the same age (Fig. ...

Context 4

... T. pratensis (Fig. 3B). In contrast, the elongation response of actively growing leaves (12-day-old seedlings) started immediately after burial (Fig 1B) or within a few days after burial for the 36-days-old plants (Fig. 1C). However, leaf elongation of the 36-day-old T. pratensis plants was evident only ten days after the start of the treatment (Fig. ...

Context 5

... seems that more extended period of preserving tissue elongation competence at leaf bases of T. heterospermus compared to T. pratensis acts as a significant component of tolerance to the moderate burial of the former. Also, the physiological ability to reallocate resources to shoot was seen for T. heterospermus (Fig. 2), but not for T. pratensis (Fig. 4). This mechanism has also been demonstrated for other species tolerant to sand burial (Maun, 1998). However, even for burial-tolerant primary sand dune coloniser species such as Sporobolus virginicus, the elongation of internodes of buried shoots was not accompanied by a decrease in root to shoot ratio ( FrosInI et al., 2012). ...

Context 6

... stages, established plants could tolerate 24% sand burial intensity relative to plant height, showing increased shoot growth by more than 100% and resource allocation from roots (Fig. 2). In contrast, dry meadow species T. pratensis, with no apparent adaptation to shifting sand conditions, showed a maximum increase of shoot biomass only by 35% (Fig. ...