FIELD RESPONSES OF GRAIN-SORGHUM TO A SALINITY GRADIENT
FIELD RESPONSES OF GRAIN-SORGHUM TO A SALINITY GRADIENT
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DOI：
10.1016/0378-4290(95)00018-l
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发表时间：
1995-07-01
影响因子：
5.8
通讯作者：
LASA, JM
中科院分区：
文献类型：
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作者：
IGARTUA, E;GRACIA, MP;LASA, JM
高粱是中等盐碱度地区的潜在作物，已被确定为相当耐盐，并显示出该性状的种内变异性。本研究旨在描述高粱对盐灌的反应，评价一组基因型对盐的反应，并分析几种农艺生理性状与耐盐性的关系。在为期3年的试验中，将11个公共自交系和1个品种暴露在由三线源喷灌系统形成的盐度梯度（NaCl和CaCl2, 1:1 w/w）下。受盐度影响最大的性状是增重、单株粒数、茎干重（籽粒和秸秆）、收获指数和叶片氯、钠、钙、钾浓度。株高、穗长和单株穗数受盐度影响中等，而开花时间和单株总叶数不受影响。鉴定了两组三种基因型，它们在三年中对盐度的反应始终相反。两组间的耐受性差异与总茎部生物量差异无关，而与最咸条件下生物量分配模式的不同有关。耐、敏感基因型在叶片氯离子和钾离子浓度上存在显著差异。讨论了后者在确定对盐度的对比基因型反应中的可能含义。
Grain sorghum is a potential crop for moderately saline areas, having been identified as fairly tolerant to salinity, and shown to contain intraspecific variability for that trait. The aim of this work was to describe the responses of grain sorghum to saline irrigation, assess the responses of a set of genotypes to salinity, and to analyze the relationships between several agronomic and physiological traits and salinity tolerance. In an experiment during three years, eleven public inbred Lines and one cultivar were exposed to a salinity gradient (NaCl and CaCl2, 1:1 w/w) created with a triple line source sprinkler system. The traits most affected by salinity were gain yield, number of grains per head, shoot dry weight (both grain and stover), harvest index, and leaf chloride, sodium, calcium, and potassium concentrations.Plant height, head length, and head number per plot were moderately affected by salinity, whereas flowering time, and total number of leaves per plant were unaffected. Two sets of three genotypes were identified with consistently contrasting responses to salinity across the three years. The differences in tolerance between these two groups were not associated with differences in total shoot biomass, but rather with different patterns of biomass partitioning under the most saline conditions. There were significant differences between the tolerant and susceptible genotypes in leaf chloride and potassium concentrations. The possible implications of the latter in the determination of the contrasting genotypic responses to salinity are discussed.