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以3年生海滨木槿(Hibiscus hamabo)为材料,经不同浓度(50、100、200和400mmol·L~(-1))的NaCl处理,初步研究了海滨木槿的耐盐性。海滨木槿的新枝长度、叶片大小和数量及根系生物量随着NaCl浓度的增加而显著降低。但是叶片光合系统Ⅱ的光化学效率(Fv/Fm)并没有随着盐胁迫程度的增加而降低。并且叶片中chla和chlb的含量、chla/chlb比值,以及可溶性蛋白质含量在NaCl胁迫下有升高的趋势。这说明,尽管海滨木槿的生长在NaCl胁迫下有所降低,但是盐胁迫并没有破坏海滨木槿叶片正常的生理功能。切片结果表明,海滨木槿叶片栅栏组织厚度、栅栏组织与海绵组织的比值和叶片的紧密度(CTR)在NaCl处理中有所增加。同时发现在叶片的下表皮分布着由多细胞组成的腺毛和浓密的星状毛。这些结果表明海滨木槿可通过减缓生长速度、改变叶片结构和向体外分泌盐分来抵御盐胁迫的危害。
The 3-year-old Hibiscus hamabo was used to study the salt tolerance of Hibiscus margarita at different concentrations (50, 100, 200 and 400 mmol·L -1). The length of new branches, leaf size and number and root biomass of Hibiscus marina were significantly decreased with the increase of NaCl concentration. However, the photochemical efficiency (Fv / Fm) of leaf photosynthetic system II did not decrease with the increase of salt stress. And the content of chla and chlb, the ratio of chla / chlb and the content of soluble protein in leaves increased under the NaCl stress. This shows that, although the growth of the sea hibiscus reduced under NaCl stress, but the salt stress did not undermine the normal physiological function of the seaweed hibiscus leaves. The results of slicing showed that the thickness of palisade tissue, the ratio of palisade tissue to spongy tissue and the leaf compactness (CTR) increased in NaCl treatments. Also found in the lower epidermis of the leaves distributed by the multicellular glandular hairy and dense stellate hair. These results indicate that sea-shore hibiscus can resist the harm of salt stress by slowing the growth rate, changing the structure of the leaves and secreting the salt in vitro.