乙烯对旱后复水玉米某些生理特性的影响

Effects of Ethylene on Some Physiological Characteristics of Maize at Rehydration after Drought Stress

摘要:

研究了在不同水分条件下盆栽的玉米(Zea mays L.)品种‘郑单958’幼苗，经乙烯利和AgNO3处理，其对复水前后某些生理特征的变化。结果表明：复水前，在不同程度干旱胁迫下施用乙烯利有利于增加玉米的生物量、叶片相对含水量、总叶绿素含量、可溶性蛋白质含量、叶片硝酸还原酶(NR)活性和谷氨酰胺合成酶(GS)活性；而AgNO3处理明显降低生物量、叶片相对含水量、可溶性蛋白质含量、NR活性和GS活性。复水后，乙烯利处理的玉米生物量、总叶绿素含量、可溶性蛋白质含量明显高于对照，叶片相对含水量、NR和GS活性与对照相近；经轻度与重度干旱后复水，AgNO3处理明显降低玉米生物量和可溶性蛋白含量，对叶片相对含水量、NR、GS活性影响不明显。因此，施用乙烯利有利于提高干旱后复水条件下苗期玉米对干旱的抗性。

Abstract:

The effects of ethylene on some physiological characteristics of maize (Zea mays L.) ‘Zhengdan 958’ cultured in pot at rehydration after drought stress were studied. The results showed that the biomass, relative water content, contents of chlorophyll and soluble protein, activities of nitrate reductase (NR) and glutamine synthetase (GS) in leaves enhanced treated with ethephon before rehydration, while the biomass, relative water content, soluble protein content, activities of NR and GS in seedlings reduced treated with AgNO3 significantly. After rehydration, the biomass, contents of chlorophyll and soluble protein in seedlings treated with ethephon were significantly higher than that of control treatment, while relative water content, NR and GS activities were closer to control treatment. But the biomass, soluble protein content decreased treated by AgNO3, and there were little effects on relative water content, NR and GS activities. So, spraying ethephon could promote maize seedlings resistant to drought.