Growth and physiological responses of six barley genotypes to waterlogging and subsequent recovery
Growth and physiological responses of six barley genotypes to waterlogging and subsequent recovery
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DOI：
10.1071/ar03097
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发表时间：
2004-01-01
影响因子：
--
通讯作者：
Shabala, S
中科院分区：
文献类型：
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作者：
Pang, JY;Zhou, MX;Shabala, S
本文研究了6个不同来源的大麦品种(中国3个，澳大利亚2个，日本1个)在人工盆栽和垂直土壤两种不同土壤类型上对渍水和恢复的生长反应。对一系列生理指标进行了评估，以开发一种辅助选择耐涝品种的方法。3或4个展叶期的植株受涝3周，然后恢复2周。淹水对地上部和根部生长均有负面影响。随着渍水胁迫的发展，叶绿素含量、CO2同化速率和光系统II的最大量子效率(Fv/Fm)显著下降。在两个试验中，NASO NIJO的受涝影响最大，ZP、Gairdner、DYSYH和Franklin居中，TX9425的受涝影响最小。对根的解剖学研究表明，这种反差的行为可能部分是由于大麦根中通风组织形成模式的显著差异。排水2周后，所有基因型植物的不良反应都有所减轻。总体而言，TX9425的生长继续好于其他品种，而Naso Nijo的恢复速度极慢。因此，选择光合作用速率或总叶绿素含量下降幅度最小的品种，有利于筛选少量耐涝品系，而对于数量较多的品系，选择叶绿素荧光是最合适的方法。
In this study, the growth response of 6 barley genotypes of different origin (3 from China, 2 from Australia, 1 from Japan) to waterlogging and subsequent recovery was evaluated in 2 different soil types, an artificial potting mix and a Vertosol. A range of physiological measurements was assessed, to develop a method to aid selection for waterlogging tolerance. Plants at the 3 or 4 expanded leaf stages were subjected to waterlogging for 3 weeks followed by 2 weeks of recovery. Both shoot and root growth was negatively affected by waterlogging. As waterlogging stress developed, chlorophyll content, CO2 assimilation rate, and maximal quantum efficiency of photosystem II (Fv/Fm) decreased significantly. The adverse effect of waterlogging was most severe for genotype Naso Nijo, intermediate for ZP, Gairdner, DYSYH, and Franklin, and least for TX9425 in both trials. Studies of the root anatomy suggested that such a contrasting behaviour may be partially due to a significant difference in the pattern of aerenchyma formation in barley roots. The adverse effects in stressed plants were alleviated after 2 weeks of drainage for all genotypes. In general, TX9425 continued to grow better than other varieties, whereas recovery of Naso Nijo was extremely slow. It is suggested that screening a small number of lines for waterlogging tolerance could be facilitated by selecting genotypes with least pronounced reduction of photosynthetic rate or total chlorophyll content, and for a larger number of lines, chlorophyll fluorescence is the most appropriate tool.