摘要
采用聚乙二醇(PEG-6000)模拟根际土壤水分胁迫,分别在香料烟移栽后30d、45d、60d对其进行不同程度的短期水分胁迫处理,测定不同水分胁迫下香料烟叶片水分及渗透调节物质含量的变化。结果表明,在各个生育期随水分胁迫程度的加强,香料烟叶片组织水分含量逐渐降低,渗透调节物质可溶性糖、脯氨酸、K+、Ca2+、Mg2+含量增加。水分胁迫下,各种渗透调节物质在不同生育期增加幅度不同,对渗透调节的贡献不一样,K+、水溶性糖、Ca2+对香料烟渗透调节的相对贡献较大,脯氨酸次之,Mg2+最小。
Oriental tobacco plants were treated with PEG-6000 solution of different concentrations to imitate water stress at 30d, 45 d, 60d after transplanting. Changes of water content and osmoregulatory substance were determined. Results showed that water content in leaves gradually decreased, while the content of soluble sugar, free proline, K^＋ , Ca^2＋ , and Mg^2＋ remarkably increased with the enhancement of water stress degree at different growing stages. Under water stress different osmoregulatory substance had different increasing range and variously contributed to the osmotic adjustment. The contribution of K^＋, soluble sugar, Ca^2＋ to osmoregulation was greater than that of free proline, while that of Mg^2＋ to OA was the lowest.
出处
《中国烟草学报》
EI
CAS
CSCD
2008年第6期41-43,47,共4页
Acta Tabacaria Sinica
基金
上海烟草(集团)公司资助项目(05-640)
关键词
香料烟
水分胁迫
含水量
渗透调节物质
oriental tobacco
water-stress
water content
osmoregulatory substance
