Physiological integration enhanced the tolerance of Cynodon dactylon to flooding
Physiological integration enhanced the tolerance of Cynodon dactylon to flooding
复制标题
生理整合增强狗牙根对洪水的耐受性
DOI：
10.1111/plb.12254
复制
发表时间：
2015-03-01
期刊：
影响因子：
3.9
通讯作者：
Xie, Z. Q.
中科院分区：
文献类型：
--
作者：
Li, Z. J.;Fan, D. Y.;Xie, Z. Q.
许多耐淹物种是克隆植物，然而，生理整合对植物对淹水反应的影响却受到了有限的关注。我们假设淹水可以引起克隆植物碳水化合物和ROS(活性氧)代谢的变化，生理整合可以缓解胁迫的不利影响，从而恢复淹水分株的生长。在本研究中，我们对狗牙根顶端分株和顶端与基株之间的地上部切断(防止生理整合)进行了析因试验，狗牙根是一种多年生匍匐茎草种，具有相当强的耐水淹能力。淹水诱导的反应包括根生物量下降，可溶性糖和淀粉积累，以及顶端分株中超氧化物歧化酶(SOD)和抗坏血酸过氧化物酶(APX)活性增加。生理整合缓解了胁迫分株的生长抑制、碳水化合物积累和抗氧化酶活性的诱导，正如预期的那样，而非胁迫分株没有任何明显的成本。我们推测，克隆植物中淹水胁迫的缓解可能依赖于通过生理整合在分株之间传递的氧化能力和电子受体。
Many flooding-tolerant species are clonal plants; however, the effects of physiological integration on plant responses to flooding have received limited attention. We hypothesise that flooding can trigger changes in metabolism of carbohydrates and ROS (reactive oxygen species) in clonal plants, and that physiological integration can ameliorate the adverse effects of stress, subsequently restoring the growth of flooded ramets. In the present study, we conducted a factorial experiment combining flooding to apical ramets and stolon severing (preventing physiological integration) between apical and basal ramets of Cynodon dactylon, which is a stoloniferous perennial grass with considerable flooding tolerance. Flooding-induced responses including decreased root biomass, accumulation of soluble sugar and starch, as well as increased activity of superoxide dismutase (SOD) and ascorbate peroxidase (APX) in apical ramets. Physiological integration relieved growth inhibition, carbohydrate accumulation and induction of antioxidant enzyme activity in stressed ramets, as expected, without any observable cost in unstressed ramets. We speculate that relief of flooding stress in clonal plants may rely on oxidising power and electron acceptors transferred between ramets through physiological integration.