干旱条件下不同倍体春小麦根系碳消耗及其与产量形成的关系

Root Carbon Consumption of Spring Wheat with Different Ploidy under Drought Conditions and Its Relationship to Yield

在自动控制的遮雨棚中,用桶栽法研究了干旱条件下不同倍体春小麦根系耗碳过程及其与子粒产量的关系。分别对二倍体小麦MO1、四倍体小麦DM22和六倍体小麦陇春8275进行充分供水(CK)和中度干旱胁迫处理(二者土壤含水量分别保持在田间持水量的75%和45%),结果表明,干旱胁迫下六倍体小麦陇春8275比二倍体小麦MO1和四倍体小麦DM22有较高的光合固碳量、较低的根系碳消耗量及较高的光合产出,因此认为这是六倍体小麦在干旱条件下既能提高水分利用效率又能保持较高子粒产量的主要原因。

The relationship between the root carbon consumption and grain yield of spring wheat with different ploidy under drought conditions was studied by pot method in automatic controlling awning.Diploid wheat MO1,tetraploid wheat DM22 and hexaploid wheat Longchun 8275 were treated by sufficient water supply(CK) and mid-drought stress(with soil water content was 75% and 45% of that in field respectively).The results should that hexaploid wheat Longchun 8275 had higher photosynthetic fixed carbon rate than diploid wheat MO1 and tetraploid wheat DM22,lower root carbon consumption and higher photosynthetic yield under drought,which were considered as the main reasons why hexaploid wheat could raise its water use efficiency and retain high grain yield under drought stress.