Relationship between constitutive root aerenchyma formation and flooding tolerance in Zea nicaraguensis
Relationship between constitutive root aerenchyma formation and flooding tolerance in Zea nicaraguensis
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DOI：
10.1007/s11104-013-1641-0
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发表时间：
2013-09-01
期刊：
影响因子：
4.9
通讯作者：
Omori, Fumie
中科院分区：
文献类型：
--
作者：
Mano, Yoshiro;Omori, Fumie
尼加拉瓜大蜀黍适应经常被洪水淹没的低地，被认为是开发耐洪玉米的宝贵种质资源。该物种在排水良好的条件下可以形成组成性根通气组织。本研究的目的是筛选尼加拉瓜种质形成组成性通气组织的能力，获得具有不同通气组织形成程度的后代，并比较这些后代的耐淹性。我们评估了八个尼加拉瓜种质和几个分离群体的幼苗根皮层的组成性通气组织形成情况。我们还评估了选择的高或低程度通气组织形成的品系的耐淹性。八个种质的幼苗在通气组织形成方面表现出极其广泛和连续的变化范围。通过两个种质内的表型选择，我们获得了具有高或低程度的组成性通气组织形成的品系。选择形成度较高的品系与形成度较低的品系相比，通过芽干重比（淹水：对照）评估显示出相对较高的淹水耐受性。形成组成性通气组织的能力较大，可以增强淹水耐受性。
The teosinte Zea nicaraguensis, which is adapted to frequently flooded lowlands, is considered a valuable germplasm resource for the development of flooding-tolerant maize. This species can form constitutive root aerenchyma under well-drained conditions. The objectives of this study were to screen Z. nicaraguensis accessions for the capacity to form constitutive aerenchyma, to obtain progeny with differing degrees of aerenchyma formation, and to compare the flooding tolerance of these progeny.We evaluated constitutive aerenchyma formation in the root cortex of seedlings of eight accessions and several segregating populations of Z. nicaraguensis. We also evaluated flooding tolerance in lines selected for high or low degrees of constitutive aerenchyma formation.Seedlings of the eight accessions showed an extremely wide and continuous range of variation in aerenchyma formation. By phenotypic selection within two accessions, we obtained lines with either high or low degrees of constitutive aerenchyma formation. The lines selected for a higher degree of formation showed relatively high flooding tolerance evaluated by shoot dry weight ratio (flooded:control) than those with a lower degree of formation.A greater capacity to form constitutive aerenchyma can enhance flooding tolerance.