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首页> 外文期刊>Journal of Experimental Botany >Effect of salinity and water stress during the reproductive stage on growth, ion concentrations, delta C-13, and delta N-15 of durum wheat and related amphiploids
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Effect of salinity and water stress during the reproductive stage on growth, ion concentrations, delta C-13, and delta N-15 of durum wheat and related amphiploids

机译：生育期盐分和水分胁迫对硬粒小麦和相关二倍体生长，离子浓度，δC-13和δN-15的影响

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The physiological performance of durum wheat and two related amphiploids was studied during the reproductive stage under different combinations of salinity and irrigation. One triticale, one tritordeum, and four durum wheat genotypes were grown in pots in the absence of stress until heading, when six different treatments were imposed progressively. Treatments resulted from the combination of two irrigation regimes (100% and 35% of container water capacity) with three levels of water salinity (1.8, 12, and 17 dS m(-1)), and were maintained for nearly 3 weeks. Gas exchange and chlorophyll fluorescence and content were measured prior to harvest; afterwards shoot biomass and height were recorded, and delta C-13, delta N-15, and the concentration of nitrogen (N), phosphorus, and several ions (K+, Na+, Ca2+, Mg2+) were analysed in shoot material. Compared with control conditions (full irrigation with Hoagland normal) all other treatments inhibited photosynthesis through stomatal closure, accelerated senescence, and decreased biomass. Full irrigation with 12 dS m(-1) outperformed other stress treatments in terms of biomass production and physiological performance. Biomass correlated positively with N and delta N-15, and negatively with Na+ across genotypes and fully irrigated treatments, while relationships across deficit irrigation conditions were weaker or absent. delta C-13 did not correlate with biomass across treatments, but it was the best trait correlating with phenotypic differences in biomass within treatments. Tritordeum produced more biomass than durum wheat in all treatments. Its low delta C-13 and high K+/Na+ ratio, together with a high potential growth, may underlie this finding. Mechanisms relating delta N-15 and delta C-13 to biomass are discussed.
机译：研究了不同盐度和灌溉量组合下硬粒小麦和两种相关二倍体在生育期的生理性能。在没有压力的情况下，将一种黑小麦，一种三聚体和四种硬粒小麦基因型在盆中生长，直到抽穗，然后逐步实施六种不同的处理方法。两种灌溉方式（分别为容器水容量的100％和35％）和三种水盐度（1.8、12和17 dS m（-1））的结合产生了处理效果，并维持了将近3周。收获前测量气体交换和叶绿素荧光及含量。然后记录芽的生物量和高度，并分析芽材料中的C-13，N-15和氮（N），磷和几种离子（K +，Na +，Ca2 +，Mg2 +）的浓度。与对照条件（霍格兰正常灌溉）相比，所有其他处理均通过气孔关闭，加速衰老和减少生物量来抑制光合作用。在生物量生产和生理性能方面，以12 dS m（-1）进行的全面灌溉优于其他胁迫处理。在不同基因型和完全灌溉处理下，生物量与氮和δN-15呈正相关，而与钠离子呈负相关，而在亏缺灌溉条件下的关系则较弱或不存在。 δC-13与所有处理中的生物量均不相关，但它是与处理中生物量的表型差异相关的最佳性状。在所有处理中，三硬de产生的生物量都比硬质小麦大。它的低C-13值和高K + / Na +比以及较高的潜在增长可能是这一发现的基础。讨论了将δN-15和δC-13与生物质相关的机理。

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