Filters: Tags: Acclimation (X)2 results (61ms)
Drought-induced changes in water relations in broom snakeweed (Gutierrezia sarothrae) under greenhouse-and field-grown conditions
Pressure-volume analyses were done on a half-shrub broom snakeweed (Gutierrezia sarothrae) subjected to different soil water regimes under pot- and field-grown conditions. Under pot and field conditions, water deficit decreased water and osmotic potentials. In the severely droughted pot-grown, osmotic potential at full turgor (?100) decreased by 0.44 MPa due to reduced symplastic volume, the result of a decreased leaf turgid to dry weight (TW/DW) ratio. A reduction of 0.86 MPa in ?100 was observed in the field-grown plants subjected to the first drought cycle, but increased cell wall elasticity occurred in the second drought cycle. The lowered ?100 was attributed to osmotic adjustment and reduced symplastic volume....
Gas Exchange and Carbohydrate and Nitrogen Concentrations in Leaves of Pascopyrum smithii (C3) and Bouteloua gracilis (C4) at Different Carbon Dioxide Concentrations and Temperatures
Pascopyrum smithii (C3) andBouteloua gracilis (C4) are important forage grasses native to the Colorado shortgrass steppe. This study investigated photosynthetic responses of these grasses to long-term CO2enrichment and temperature in relation to leaf nonstructural carbohydrate (TNC) and [N]. Glasshouse-grown seedlings were transferred to growth chambers and grown for 49 d at two CO2concentrations (380 and 750 ?mol mol?1) at 20 and 35 �C, and two additional temperatures (25 and 30 �C) at 750 ?mol mol?1CO2. Leaf CO2exchange rate (CER) was measured at a plant's respective growth temperature and at two CO2concentrations of approx. 380 and 700 ?mol mol?1. Long-term CO2enrichment stimulated CER in both species, although...