抗重水冬黑麦幼苗对水和钾离子的吸收

Water and potassium ion absorption by deuterium oxide resistant winter rye seedlings.

作者信息

Shibabe S, Yoda K

出版信息

Radioisotopes. 1985 May;34(5):266-9. doi: 10.3769/radioisotopes.34.5_266.

DOI:10.3769/radioisotopes.34.5_266

Abstract

The concentrations of deuterium oxide (D2O) in the root tissue water of winter rye seedlings equilibrated with the external D2O concentration within 30 min and in the shoot tissue water after 5-6 h. The equilibrated value in the root water was 87% and in the shoot water, 55% of the external concentration. The K+ absorption rate of the seedlings decreased from a value of 39 to 18 mumol g-1 h-1 when the D2O concentration was changed through a range from 0% to 97%. D2O suppressed the absorption of water and K+ by the seedlings. The higher the D2O concentration the greater the suppression, but it was less than with similarly treated rice plants. However, the process of D2O absorption by the seedlings was similar to that of rice seedlings (Envir. exp. Bot., 24, 369).

摘要

冬黑麦幼苗根组织水分中的氧化氘（D₂O）浓度在30分钟内与外部D₂O浓度达到平衡，而茎组织水分中的浓度在5 - 6小时后达到平衡。根中水分的平衡值为外部浓度的87%，茎中水分的平衡值为外部浓度的55%。当D₂O浓度从0%变化到97%时，幼苗的钾离子吸收速率从39 μmol g⁻¹ h⁻¹降至18 μmol g⁻¹ h⁻¹。D₂O抑制了幼苗对水分和钾离子的吸收。D₂O浓度越高，抑制作用越强，但比同样处理的水稻植株的抑制作用小。然而，幼苗吸收D₂O的过程与水稻幼苗相似（《环境与实验植物学》，24卷，369页）。