Growth and carbohydrate dynamic of perennial ryegrass seedlings during PEG-simulated drought and subsequent recovery.

Due to the increasing occurrence of drought events, drought recovery has become equally important as drought resistance for long-term growth and survival of plants. However, information regarding the mechanism that controls growth recovery of herbaceous perennials is not available. In this study, perennial ryegrass (Lolium perenne) was rewatered after eight-day exposure to three drought intensities simulated by polyethylene glycol-6000.

Effects of Wilting and Dew on the Water Isotope Composition of Detached Grass in Temperate Grassland.

Understanding the water isotopes in feed products derived from grass is fundamental for tracing domestic animal products. Grass silage water was reported to have fewer heavy isotopes than fresh grass, but it is still unknown whether dew formation (either dewfall or dewrise), exchange with soil water, or other processes override the expected enrichment of heavy isotopes due to wilting. The isotopic variations of water (δH, δO) in fresh grass and cut grass during wilting on soil and on plastic were compared in this study.

Shoot δ C values as an indicator of cumulative stress: The role of re-watering during drought and salinity stress.

Rationale: The carbon stable isotope composition (δ C value) of a plant can reflect prolonged drought and salinity, as different isotopic signals resulting from drought and salinity can be retained in plant tissue. Commonly, drought and salinity are interrupted by intermittent precipitation or irrigation. It remains unclear whether the δ C values reflect the cumulative duration of intermittent drought or salinity stress.