Differences in dry matter production, grain production, and photosynthetic rate in barley cultivars under long-term salinity.
Differences in dry matter production, grain production, and photosynthetic rate in barley cultivars under long-term salinity.
复制标题
长期盐度下大麦品种干物质产量、籽粒产量和光合速率的差异。
DOI：
10.1080/1343943x.2017.1343647
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发表时间：
2017
影响因子：
2.5
通讯作者：
Kazuhiro Sato
中科院分区：
文献类型：
--
作者：
Tadashi Hirasawa;Kosuke Sato;Makoto Yamaguchi;Ryohei Narita;Asuka Kodama;Shunsuke Adachi;Taiichiro Ookawa;Kazuhiro Sato
土壤盐渍化是造成作物生产力严重损失的主要环境胁迫。大麦（Hordeum vulcanum L.）是可以在受盐影响的田地中生长的少数大田作物之一，并且已知在盐条件下生产力的品种差异。为了阐明盐胁迫下对籽粒产量影响最大的性状，将耐盐（OUE 812）和盐敏感（OUC 613）大麦品种从苗期到收获期在含有不同浓度NaCl的蛭石中进行生长。随着NaCl浓度的增加，地上部分干重和粒重显著下降。用150 mM和200 mM NaCl处理的植株，OUC 613的地上部分干重和籽粒重比OUE 812的下降更显著。与OUE 812相比，OUC 613的成熟率显著降低，导致籽粒产量显著下降。在200 mM NaCl处理的植物中，光合速率在开始NaCl处理后三周下降，但品种之间的光合速率的显着差异没有出现，直到7周的NaCl处理。OUE 812在成熟期的光合速率显著高于OUC 613，从成熟到收获的干物质生产显著高于OUC 613。保持较高的光合速率可能有助于OUE 812较高的籽粒产量。高成熟率和高光合速率可作为大麦耐盐性育种的目标性状。
Soil salinity is a major environmental stress causing significant loss of crop productivity. Barley (Hordeum vulgareL.) is one of the few field crops that can grow in salt-affected fields and varietal differences in productivity under salinity conditions were known. To clarify the trait most responsible for grain production under salt stress, barley cultivars that were salt tolerant (OUE812) or salt sensitive (OUC613) were grown from seedling to harvest stage in vermiculite containing various concentrations of NaCl. Dry weight of aboveground parts and grain weight decreased significantly with increasing NaCl concentration. The dry weight of the aboveground parts and grain weight decreased more significantly in OUC613 than in OUE812 for plants treated with 150 mM and 200 mM NaCl. A marked reduction in ripening percentage caused significantly decreased grain production in OUC613 as compared with OUE812. In plants treated with 200 mM NaCl, the photosynthetic rate decreased three weeks after starting the NaCl treatment, but a significant difference between cultivars in photosynthetic rate did not appear until seven weeks of NaCl treatment. OUE812 kept a higher photosynthetic rate during ripening than did OUC613 and dry matter production during the period from ripening to harvest was significantly larger in OUE812 than in OUC613. Keeping a higher photosynthetic rate might have contributed to higher grain production in OUE812. Higher ripening percentage and higher rate of photosynthesis during ripening might be target traits in breeding to improve the tolerance of barley to long-term salt stress.