论文部分内容阅读
提高作物本身的水分利用效率（WUE）是实现作物高效用水的生理基础。用10个不同染色体倍性的小麦进化材料在管栽和大田条件下研究了小麦整株水平WUE和根系生长的变化以及两者之间的关系。结果表明,无论是干旱还是供水条件下,在小麦染色体倍性从2n到6n的进化过程中,整株水平的WUE随染色体倍性的增加而增加,而根系生长（根干重、根长）和根冠比则随染色体倍性的增加而降低;整株水平上的WUE与小麦的根干重、根长和根冠比均成显著线性负相关关系,随根重、根长和根冠比的增加而降低。上述结果说明,在小麦进化过程中,小麦的根系生长存在对其WUE不利的冗余,只不过这种根系生长的冗余随染色体倍性的增加而降低,并因此提高了其WUE.
Increasing the water use efficiency (WUE) of crops is the physiological basis for achieving efficient water use in crops. Ten wheat cultivars with different ploidy of chromosome were used to study the changes of WUE and root growth and the relationship between the whole plant WUE and the growth of the root system under tube and field conditions. The results showed that the WUE of whole plant increased with the increase of chromosome ploidy during the evolution of wheat chromosome ploidy from 2n to 6n in both drought and water supply conditions, while the root growth (root dry weight, root length) And root / shoot ratio decreased with the increase of chromosome ploidy. WUE at the whole plant had a significant linear negative correlation with root dry weight, root length and root / shoot ratio of wheat, with root weight, root length and root crown Than the increase and decrease. The above results indicate that during the evolution of wheat, root growth of wheat has unfavorable redundancy to its WUE, except that the redundancy of root growth decreases with the increase of chromosome ploidy and therefore increases its WUE.