The importance of iron supply during repetitive harvesting of Aster tripolium.
The importance of iron supply during repetitive harvesting of Aster tripolium.
复制标题
重复采收紫菀期间铁供应的重要性。
作者：
Y. Ventura;M. Myrzabayeva;Z. Alikulov;S. Cohen;Zion Shemer;M. Sagi
紫菀是一种盐沼盐生植物，最近作为经济作物蔬菜引起了人们的兴趣。叶片产量和质量进行了调查，在植物与盐的实验珍珠岩在盆和沙丘砂上的地块。在14天的周期中重复收获植物。A.用50mM NaCl灌溉的Tripolium在盆中生长时表现出最高产量，而在小区试验中，在灌溉水中高达80mM NaCl时，生物量积累没有显著差异。叶片的化学成分随着盐分的变化而变化，与不补充氯化钠的对照植物相比，表现出更高水平的电导率、总可溶性溶质以及非酶抗氧化化合物抗坏血酸和多酚。使用重复的收获制度，叶片失绿症发生，一种症状共享的氮或铁的不足。五种铁螯合物制剂在盆栽中与50mM NaCl一起生长的植物中的比较应用揭示了仅两种所应用的Fe螯合物的改善的叶色和叶绿素含量。伴随着叶色恢复，硝酸还原酶的活性，硝酸盐同化过程中的第一个酶，这需要血红素铁，其适当的功能，增加了3倍，作为在小区实验中的铁处理的结果。重要的是，硝酸还原酶活性的增强与叶片硝酸盐浓度的显著降低有关。因此，我们得出结论，缺铁，除了叶片失绿，减少A。通过提高叶硝酸盐含量，改善了蒺藜草作为蔬菜的叶质。硝酸还原酶（NR）活性水平在A.三叶草叶可作为铁缺乏的指示物，其表现为硝酸盐含量的降低，这是由于在适当的铁营养下NR活性较高。这些结果表明的重要性，盐度水平和适当的铁螯合制剂的应用，以产生可销售的产量的紫菀tripolium叶菜，当商业上种植的沙丘砂。
Aster tripolium L. is a salt marsh halophyte that has recently gained interest as a cash crop vegetable. Leaf yield and quality were investigated in plants grown with salinity in experiments with Perlite in pots and in plots on dune sand. Plants were repetitively harvested in a 14-day cycle. A. tripolium irrigated with 50mM NaCl exhibited the highest yield when grown in pots, whereas in the plot experiment no significant differences in biomass accumulation occurred up to 80mM NaCl in the irrigation water. Chemical leaf composition changed with salinity, exhibiting higher levels of electrical conductivity, total soluble solutes and the non-enzymatic antioxidant compounds ascorbic acid and polyphenols compared with control plants grown without NaCl supplementation. Using the repetitive harvest regime, leaf chlorosis occurred, a symptom shared by deficiencies in either nitrogen or iron. Comparative applications of five iron chelate formulations in plants grown with 50mM NaCl in pots revealed improved leaf colour and chlorophyll content for only two of the applied Fe-chelates. Concomitantly with leaf colour restoration, the activity of nitrate reductase, the first enzyme during nitrate assimilation, which requires heme-iron for its proper function, increased 3-fold as a result of the iron treatment in the plot experiment. Importantly, the enhancement of nitrate reductase activity was associated with a considerable decrease in the leaf nitrate concentration. Therefore, we concluded that iron deficiency, in addition to leaf chlorosis, reduces A. tripolium leaf quality as a vegetable by increasing the leaf nitrate content. Furthermore, nitrate reductase (NR) activity levels in A. tripolium leaves may act as an indicator of iron deficiency that manifests itself as reduced nitrate content owing to the higher NR activity upon proper iron nutrition. These results demonstrate the importance of salinity level and the application of an appropriate iron-chelating formulation to generate marketable yields of Aster tripolium leafy vegetable when grown commercially on dune sand.