盐胁迫对獐茅生长及Na^+和K^+含量的影响  

Effects of Salt Stress on the Growth and Na^+ and K^+ Contents in Aeluropus littoralis var. sinensis Debeaux

作　　者：刘志华[1] 赵可夫[2] 

机构地区：[1]衡水学院生物系,河北衡水053000 [2]山东师范大学逆境植物研究所,济南250014

出　　处：《植物生理与分子生物学学报》2005年第3期311-316,共6页Journal Of Plant Physiology and Molecular Biology

基　　金：国家重点基础研究专项经费(No.G1999011700)资助。~~

摘　　要：用含0￣200mmol/L浓度的NaCl的Hoagland培养液处理獐茅幼苗,处理17d后测定一些生理指标,结果表明獐茅的生长受NaCl抑制程度随浓度增加而增大,没观察到最适盐浓度,且叶片较根部对盐分更敏感;有机干重的比例增大表明有机物在渗透调节中的贡献随之增大。植株在加喷对盐腺向体外排盐有抑制作用的溶液——苯硫酸胆碱100mmol/L后,Na+、K+含量在叶片内增加,而在分泌物中的量降低,并表现出生长进一步受到抑制。X-ray微区分析结果表明獐茅可以将Na+区域化到盐腺细胞,以便将其分泌到体外。After seedlings of Aeluropus littoralisvar. sinensis Debeaux were treated with differentNaCl concentrations (0–200 mmol/L) for 17 days,some physiological indexs were measured. With anincrease in NaCl concentration, the growth of A.littoralis was inhibited gradually. There was nooptimum salt concentration (Fig.1), and the shootswere more sensitive than the roots (Fig.3). The pro-portion of organic dry weight in total dry weight in-creased (Fig.2), which implies that the contributionof organic matter to osmotic adjustment increasedwith salinity. After being treated with the inhibitor—benzene-sulphuric acid cholinew hich could inhibitethe salt glands to secrete the salinity outside the body.The Na+ and K+ contents of leaves increased, whilethe amount of Na+ and K+ decreased in the secre- ,.tion (Fig.8), and the growth was severely inhibited(Fig.1). After being treated with NaCl 100 mmol/L,the relative Na+ contents in the cap cells and basalcells determined by X-ray microanalysis were fromabout one to more than triple those of the epidermisand mesophyllous cells (Table 1), it shows that thesalt glands could effectively collect Na+ from othercells and secrete them outside the body to keepnormal physiologicalf unction.

关 键 词：獐茅 NACL 盐腺抑制剂 盐腺 X-ray微区 分析 

分 类 号：Q945.78[生物学—植物学]