甘草腺体结构及对渗透胁迫的调节作用

甘草叶片上的腺体是其特殊的耐旱形态学结构,通过腺体分泌多糖调节叶肉细胞渗透势是其耐旱的重要生理特征。甘草叶片处于两面对称叶尚未展开期,部分腺体头部已分泌积累呈球状的多糖液,约占总腺体数的13.0%;部分腺体开始分泌多糖液,约占总腺体数的11.6%;75.3%的腺体尚未开始分泌多糖液,表明该期的腺体已有部分开始参与渗透调节。甘草发育成熟的功能叶上的所有腺体头部都分泌有呈球状的多糖液,表明该期所有的腺体都通过向外分泌多糖参与渗透调节。15%PEG+Hoagland培养的渗透胁迫比Hoagland培养的非渗透胁迫,叶内多糖增加了59.8%(P<0.01)。甘草通过腺体向腺体外分泌多糖液的作用,维持叶肉细胞适合的渗透势是甘草一种主动调节过程和方式。

Glands structure of liquorice and its regulation mechanism on osmosis stress

Foliar glands of liquorices are special morphological structures for drought tolerance.The glandular organ regulates osmotic potential of diachyma cells by secretes polysaccharide,and it's also an important physiological characteristic of drought tolerance.During folded period,the two sides of young leaves are symmetrical,and about 13.0% of glandular organ heads start to secrete or accumulate polysaccharide liquid ball.About 11.6%glandular organ starts to secrete polysaccharide liquid.About 75.3%glandular organ doesn't secrete polysaccharide liquid.It's indicated that some glandular organ starts to take part in osmoregulation at that time.All glandular organ heads of mature leaf secrete polysaccharide liquid ball which indicate that all glandular organ participate osmoregulation by secrete polysaccharide toward outside.Compared with the control,the level of leaf polysaccharide increased 59.8%(P<0.01) when osmosis regulation cultivates with 15%PEG+Hoagland.Liquorices leaf secrete polysaccharide liquid toward outside in order to keep suitable osmotic potential by glandular organ,which is an initiative adjusting process and style.