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甘蔗生长前期乙烯利处理对根系生理及地上部碳氮代谢的影响
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摘要
选用两个甘蔗品种桂糖17号,新台糖22号作为试验材料,在甘蔗生长前期以三种不同乙烯利浓度:0mg/L,(清水)、100mg/L、200mg/L进行叶面喷施,研究乙烯利处理后甘蔗根系生长及根系生理效应以及与地上部碳氮代谢的关系。同时还进行了田间指标的调查。结果表明:
     100mg/L乙烯利处理后一段时间内提高了GT17、RCO22白根长和白根干重。根系活力(TTC法)增强,根尖过氧化物酶活性降低。
     100mg/L、200mg/L乙烯利处理都提高了GT17和RCO22根系伤流量,但100mg/L处理的效应较稳定,并提高了伤流液中细胞分裂素(Zeatin)的含量,以200mg/L处理的含量最高,说明乙烯利处理能提高根系合成细胞分裂素的能力,单株伤流液中钾含量高于对照,并以100mg/L乙烯利处理效果最好,伤流电导率与钾含量表现趋势一致,说明乙烯利处理后提高了根系吸收水分和矿质养分向地上部运输的能力,有利于地上部的生长。
     100mg/L乙烯利处理后一段时间内GT17叶片与氮代谢相关的指标:硝酸还原酶活性、水溶性蛋白质含量、全N量均低于对照,之后才上升并超过对照,说明乙烯利处理后一段时间内抑制了叶片氮代谢,之后反过来促进氮代谢,相应地株高也呈先抑后促效应。叶片全P、全K含量变化与全N量变化相一致,同时,叶片可溶性总糖含量呈现与氮代谢相应的先抑后促效应,说明处理后在甘蔗生长旺盛时GT17碳氮代谢协调性好。100mg/L乙烯利处理对ROC22氮代谢生理指标主要表现促进效应,但叶片可溶性总糖含量未见有相应的促进效应。200mg/L处理后两品种的碳氮代谢相关指标测定值大体呈波动性的变化。
Two sugarcane varieties, i.e. GT17 and ROC22, were employed as the plant materials. Ethephon of three concentrations, 0 mg/L, 100mg/L and 200mg/L, were sprayed on the plant leaves at early growth stage in the field experiment. In the same time, two concentrations of ethephon were used in a pot trial. The root growth and some physiological characters were measured, and their relationships with shoot metabolism of carbohydrate and nitrogen were determined. The major agronomic characters were investigated.
    For the lOOmg/L ethephon treatment, the length and dry weight of roots were apparently increased at first, but this effect diminished gradually as compared with the control. This treatment also promoted the activities of roots, decreased the activity of peroxidase in root tips.
    The 100 mg/L and 200 mg/L ethephon treatments increased the quantity of the bleeding sap, and more stable effect was observed in the lOOmg/L ethephon treatment. The ethephon treatment increased cytokinin (zeatin) concentration in the bleeding sap, and the 200mg/L ethephon treatment showed the highest. This might indicate that the plants treated with ethephon had stronger ability to produce cytokinin (zeatin) in their root systems. The ethephon treatment also had higher potassium content in the bleeding sap of each plant, and the lOOmg/L ethephon treatment showed the highest. The results of electroconductivity showed the same trend as those of potassium in the bleeding sap of each plant. These results suggested that the ethephon treatment increased the absorption ability to water and mineral elements as compared the control.
    For GT17, the treatment of 100 mg/L ethephon decreased some physiological characters that were related with nitrogen metabolism, that is, NRA activity, soluble protein and nitrogen contents in the leaves, at first, and then turned to promote them and made them higher than those of the control.
    
    
    
    The contents of phosphorous, potassium and soluble sugar, and the plant height showed the similar effects to the nitrogen. For ROC22, the 100 mg/L ethephon treatment promoted nitrogen metabolism all the time, but no promotion was observed for soluble sugar content in the leaves. The physiological characters related to metabolism of nitrogen and carbohydrate were fluctuated in the 200 mg/L ethephon treatment for both varieties.
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