Comparison of growth and mineral accumulation of two solanaceous species, Solanum scabrum Mill. (huckleberry) and S. melongena L. (eggplant), under salinity stress
Comparison of growth and mineral accumulation of two solanaceous species, Solanum scabrum Mill. (huckleberry) and S. melongena L. (eggplant), under salinity stress
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DOI：
10.1080/00380768.2013.858300
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发表时间：
2013-12-01
影响因子：
2
通讯作者：
Saneoka, Hirofumi
中科院分区：
文献类型：
--
作者：
Assaha, Dekoum V. M.;Ueda, Akihiro;Saneoka, Hirofumi
龙葵。（越橘）广泛分布于西非、东非和中非，在那里它是最重要的叶菜之一。然而，这种作物的耐盐性尚未得到评估。本研究的目的是比较越橘和茄子（S. melongena L.）对盐胁迫的反应。4周龄幼苗分别接受50mM和150mM氯化钠（NaCl）盐胁迫14d。两种植物叶片水势随盐度胁迫的增加而降低。这种减少在越橘中比在茄子中更低。盐分也降低了总干重和总叶面积，50mM处理下越橘的总干重和总叶面积与对照相比分别减少了25%和18%，茄子的总干重和总叶面积分别减少了47%和55%。50mm和150mM处理的叶片钠积累量分别比对照增加65%和66%，越橘增加18%和36%。两种盐度处理下，越橘茎和根的钠积累量均高于叶片，而茄子则相反。越橘叶片中钠的积累量低于茄子，表明越橘可能比茄子更有效地减少了钠向叶片的转运。盐度降低叶片钾积累量，增加叶片Na，导致叶片Na/K比值升高，但茄子高于越橘。盐度对越橘叶片钙（Ca）浓度也有提高作用，对茄子叶片钙（Ca）浓度有降低作用。综上所述，越橘对盐的耐受性比茄子强，而低钠和高钙对越橘叶面积减少的影响较小，这可能是越橘在盐胁迫下提高品质和维持生产力的重要因素。
Solanum scabrum Mill. (huckleberry) is widespread in West, East and Central Africa, where it constitutes one of the most important leafy vegetables. However, the salinity tolerance of this crop has not yet been assessed. The objective of this study was to assess the response of huckleberry to salinity stress in comparison with eggplant (S. melongena L.). Four-week-old seedlings of both species were subjected to two levels of salinity stress, 50mM and 150mM sodium chloride (NaCl), for 14d. Leaf water potential of both species decreased with increasing salinity stress. This decrease was lower in huckleberry than in eggplant. Total dry weight and total leaf area were also decreased by salinity, and the reductions of total dry weight and total leaf area under the 50mM treatment compared with the control were 25 and 18% in huckleberry, while they were 47 and 55% in eggplant, respectively. The increases in leaf sodium (Na) accumulation in the 50 and 150mM treatments compared with the control were 65 and 66% for eggplant and 18 and 36% for huckleberry, respectively. Na accumulation in stem and root in huckleberry was higher than that of leaf, whereas it was the reverse in eggplant under both salinity treatments. Huckleberry accumulated less Na in the leaves than eggplant, suggesting that huckleberry might reduce the transport of Na to its leaves more effectively than eggplant. The decrease of potassium (K) accumulation and the increase of Na in leaves by salinity resulted in a higher Na/K ratio in leaves, but this trend was greater in eggplant than in huckleberry. The calcium (Ca) concentration in leaves of huckleberry was also increased by salinity, whereas that of eggplant was decreased. These results indicate that huckleberry is more tolerant to salinity than eggplant, and less decrease in leaf area associated with lower leaf Na and increased Ca concentrations may be important in enhancing quality and sustaining productivity of the crop under this stress.