Moderate salinity and high ammonium/nitrate ratio enhance early growth in "summer wonder" lettuce cultivar.

Because its impact in plant development and growth and its interaction with Na and Cl, the supply of different N-forms to crops can be an easy-to-use tool with effective results on salinity tolerance. Here the effect of four N-NO/N-NH ratios (mM; 2/0, 1.6/0.

Responses of Arabidopsis and wheat to rising CO2 depend on nitrogen source and nighttime CO2 levels.

A major contributor to the global carbon cycle is plant respiration. Elevated atmospheric CO2 concentrations may either accelerate or decelerate plant respiration for reasons that have been uncertain. We recently established that elevated CO2 during the daytime decreases plant mitochondrial respiration in the light and protein concentration because CO2 slows the daytime conversion of nitrate (NO3 (-)) into protein.

Intrinsic water use efficiency controls the adaptation to high salinity in a semi-arid adapted plant, henna (Lawsonia inermis L.).

Adaptation to salinity of a semi-arid inhabitant plant, henna, is studied. The salt tolerance mechanisms are evaluated in the belief that gas exchange (water vapor and CO2) should play a key role on its adaptation to salt stress because of the strong evaporation conditions and soil water deficit in its natural area of distribution. We grow henna plants hydroponically under controlled climate conditions and expose them to control (0mM NaCl), and two levels of salinity; medium (75mM NaCl) and high (150mM NaCl).

Chilling-induced water stress: variation in shoot turgor maintenance among wild tomato species from diverse habitats.

Premise Of The Study: Cultivated tomato, Solanum lycopersicum, suffers chilling induced wilting because water movement through its roots decreases with declining soil temperatures. Certain wild tomato species exhibit resistance to chilling-induced wilting, but the extent of this chilling tolerance in wild tomatoes is not known. •

Methods: We measured shoot wilting during root chilling in wild Solanum accessions from habitats differing in elevation, temperature, and precipitation.

Carbon dioxide enrichment inhibits nitrate assimilation in wheat and Arabidopsis.

The concentration of carbon dioxide in Earth's atmosphere may double by the end of the 21st century. The response of higher plants to a carbon dioxide doubling often includes a decline in their nitrogen status, but the reasons for this decline have been uncertain. We used five independent methods with wheat and Arabidopsis to show that atmospheric carbon dioxide enrichment inhibited the assimilation of nitrate into organic nitrogen compounds.