摘要
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。
Salt tolerance of Hibiscus hamabo was preliminarily studied using its 3-：year old seedlings treated with 50,100,200 and 400 mmol ·L^-1 NaCI. The length of new branches, size of leaves, number of leaves on new branches and biomass of root reduced with NaC1 concentration in media increasing. While, the photochemical efficiency of photosynthetic system II （Fv/Fm） of H. hamabo was not influenced by salt stress. Furthermore, chla and chlb content, chla/chlb ratio and soluble protein content in leaves had an upward trend with salt concentration rising, which indicated that, despite inhibition of growth, the normal physiological functions of leaves of H. hamabo survived under salt stress. From the sections of leaves, it was found that thickness of palisade tissue, the ratio of palisade tissue to spongy tissue and cell tense ratio （CTR） of leaves increased under salt stress. Simultaneously, multi-cellular glandular trichomes and thick stellate hairs were observed on the lower epidermis of H. hamabo leaves. These results demonstrated that H. hamabo could tolerate salt stress through reducing growth rate, changing leaf anatomical structure and excreting salt.
出处
《上海交通大学学报（农业科学版）》
2010年第3期248-254,共7页
Journal of Shanghai Jiaotong University(Agricultural Science)
基金
上海市科委重大攻关项目(09dz1205003)
国家自然科学基金项目(30571474)
国家科技支撑项目(2008BAJ10B04-5)
关键词
海滨木槿
耐盐性
叶片解剖结构
叶绿素含量
可溶性蛋白质含量
Hibiscus hamabo
salt tolerance
leave anatomical structure
chlorophyll content
soluble protein content
作者简介
作者简介：王秀丽（1982-），河南省新乡人，女，硕士研究生，研究方向：园林植物抗逆生理；刘群录为本文通讯作者，E-mail：liuql@sjtu．edu.cn．
