Naidoo G, Mundree S G
Department of Botany, University of Durban-Westville, Private Bag X54001, Durban, South Africa.
Oecologia. 1993 Mar;93(3):360-366. doi: 10.1007/BF00317879.
The effects of waterlogging and salinity on morphological and physiological responses in the marsh grass Sporobolus virginicus (L.) Kunth were investigated in a 4×2 factorial experiment. Plants were subjected to four salinity levels (0, 100, 200 and 400 mol m NaCl) and two soil inundation conditions (drained and flooded) for 42 days. Flooding at 0 mol m NaCl caused initiation of adventitious surface roots, increased internal acration and plant height, induced alcohol dehydrogenase activity (ADH), and decreased belowground biomass and the number of culms per plant. Salinity increase from 0 to 400 mol m NaCl under drained conditions increased leaf and root proline concentrations and decreased photosynthesis, aboveground biomass, number of culms per plant and number of internodes per culm. Concurrent waterlogging and salinity induced ADH activity and adventitious surface roots but decreased plant height and aboveground biomass. Internal air space increased with waterlogging from 0 to 100 mol m NaCl but further increases in salinity to 400 mol m reduced air space. Combined waterlogging and salinity stresses, however, had no effect on photosynthesis or on the concentrations of proline in leaves or roots. These results are discussed in relation to the widespread colonization by S. virginicus of a wide range of coastal environments varying in soil salinity and in the frequency and intensity of waterlogging.
在一项4×2析因实验中，研究了涝渍和盐分对海滨草类植物 Virginias 鼠尾粟（Sporobolus virginicus (L.) Kunth）形态和生理反应的影响。将植物置于四个盐分水平（0、100、200和400 mol m NaCl）和两种土壤淹水条件（排水和淹水）下处理42天。0 mol m NaCl 淹水导致不定根在地表开始生长，增加了内部通气性和株高，诱导了乙醇脱氢酶活性（ADH），并降低了地下生物量和单株茎数。在排水条件下，盐分从0增加到400 mol m NaCl，增加了叶片和根系脯氨酸浓度，降低了光合作用、地上生物量、单株茎数和单株节数。同时发生的涝渍和盐分胁迫诱导了ADH活性和不定根在地表生长，但降低了株高和地上生物量。内部气腔随着涝渍从0增加到100 mol m NaCl而增加，但盐分进一步增加到400 mol m时气腔减小。然而，涝渍和盐分综合胁迫对光合作用或叶片和根系中脯氨酸浓度没有影响。结合 Virginias 鼠尾粟在广泛的沿海环境中广泛定殖的情况，讨论了这些结果，这些沿海环境的土壤盐分以及涝渍的频率和强度各不相同。
