Their water use efficiency (WUE) exceed that of duplation clone under drought stress, which show that tetraploid clones have more yield at the same irrigation.

• 两个四倍体品种的水分利用效率(WUE)无论在哪种干旱处理方式下都显著优于二倍体,说明在同等供水条件下,四倍体品种有较大的生物量产出。