Salt tolerance in two gramineae sp. Panicurn maximum and Eleusine coracana : Glycinebetaine accumulation and expression of betaine aidehyde dehydrogenase mRNA

概要

論文の詳細を見る
Two gramineae species, Panicum maximum and Eleusine coracana, were exposed to salinity stress and leaf water status, solute concentrations in cell sap, levels of betaine aldehyde dehydrogenase (BADH) and BADH mRNA were measured. Panicum maximum was able to maintain a high turgor and high relative water content at low leaf water potentials, and this was associated with the greater capacity for osmotic adjustment. Major osmotica in Panicurn maximum leaves were Na^+, Cl^-, sugar and glycinebetaine, and these solutes were increased by salinity. Na^+ and glycinebetaine concentrations in Eleusine coracana leaves also were increased by salt stress, but these solutes were in significantly lower concentrations than those measured in Panicum maximum. BADH enzyme activity and BADH mRNA levels in Panicum maximum leaves were both increased by salt stress, and their expression coincided with the observed betaine accumulation. Although the addition of abscisic acid (ABA) to leaf disks of Panicum maximum plants also increased BADH mRNA levels, these were smaller than those observed in NaCl treated leaves.
社団法人日本土壌肥料学会の論文