小麦品种可溶性糖和保护性酶与抗旱性关系研究

摘要

采用旱胁迫和灌水两种处理条件,对21个抗旱性不同的冬小麦品种苗期的可溶性糖、SOD和POD进行测定,并以籽粒产量、抗旱指数为目标性状进行抗旱性相关关系研究.结果表明:同一水分处理下不同品种间的可溶性糖、SOD和POD活性差异较大,抗旱指数高的品种明显高于抗旱指数低的品种；且丰产抗旱性品种的可溶性糖、POD和SOD酶活性大多都能同时达到或高于41.68 mg/g、169.73 U/(g·min FW)和496.33 U/(g·min FW).相关分析表明:可溶性糖和保护性酶与抗旱指数存在极显著正相关,相关系数为rSS＞ rpOD＞ rSOD;通径分析表明:干旱胁迫条件下,可溶性糖对产量的正向作用最大(0.5584),对DI的正向作用也最大(0.5264)；胁迫下各生理指标都对产量和抗旱指数起着正向的直接作用.综合分析认为可溶性糖和保护性酶是抗旱小麦较为理想的指标.%Effect of phosphorus levels and treatment time on some physiological characteristics of Phaseolus coc-cineus L. Were studied by hydroponic culture method. The results showed that the root length under the low availability of no phosphorus was about 46 % higher than that of the control, while the leaf area was decreased when the culture solution had lower phosphate. When there had lower phosphorus supplied, the root activity and acid phosphatase activity was increased . Under phosphorus deficiency, both photosynthetic rate and chlorophyll content were decreased, but intercellular CO2 was increased; both reducing sugar content and total soluble sugar content were decreased; and root activity and acid phosphatase were increased. Under phosphorus deficiency, the dry mass decreased remarkably; shoot dry mass decreased ; while root dry mass increased. These results show that phosphorus deficiency affects the distribution of carbohydrates.