Szabó-Nagy A, Abdulai M D, Erdei L
Institute of Biophysics, Hungarian Academy of Sciences, Szeged.
Acta Biol Hung. 1994;45(1):25-37.
The effects of aeroponic (AP) and hydroponic (HP) conditions on growth rate, morphological traits, potassium uptake and redox activities were compared in sunflower seedlings. Higher growth rate was found under HP than AP conditions and morphological traits were also different. The thickness of AP grown roots increased and new lateral roots with thickened root hairs were formed while the length of AP roots was small. Microscopical studies on cross-sections of the embedded root segments showed that the diameter of cross-section, the diameter of stele and the width of cortex of AP grown roots were significantly higher than those of HP plants. The element composition of AP or HP grown plants also differed, due to the different ion uptake processes. Potassium (86Rb+) uptake of AP grown plants was low and it seemed to be a passive process, while in case of HP grown plants it was decreased by both dinitrophenol and ferricyanide suggesting that the uptake process was coupled to the proton gradient. Roots of AP grown plants showed high ferricyanide reductase activity and it was accompanied by an increased acidification of the medium.
在向日葵幼苗中比较了气培（AP）和水培（HP）条件对生长速率、形态特征、钾吸收和氧化还原活性的影响。发现水培条件下的生长速率高于气培条件，形态特征也有所不同。气培生长的根厚度增加，形成了带有加粗根毛的新侧根，而气培根的长度较短。对包埋根段横截面的显微镜研究表明，气培生长根的横截面直径、中柱直径和皮层宽度显著高于水培植物。由于离子吸收过程不同，气培或水培生长植物的元素组成也不同。气培生长植物对钾（86Rb+）的吸收较低，似乎是一个被动过程，而对于水培生长植物，二硝基苯酚和铁氰化物都会使其吸收减少，这表明吸收过程与质子梯度有关。气培生长植物的根表现出高铁氰化物还原酶活性，同时伴随着培养基酸化的增加。
