中国生态农业学报2012，Vol.20Issue(10)：1303-1309,7.DOI:10.3724/SP.J.1011.2012.01303
氮素对NaCl胁迫下甜高粱种子萌发及芽苗生长与生理的影响
Effects of nitrogen on sweet sorghum seed germination, seedling growth and physiological traits under NaCl stress
摘要
Abstract
The effects of nitrogen application on germination, seedling growth and physiological traits of sweet sorghum [Sorghum bicolor (L.) Moench] were investigated under NaCl stress. The aim of the study was to enhance salt-tolerance of sweet sorghum through laboratory germination experiments at different salt and nitrogen (N) concentrations using two N sources. The results showed that either salt or N significantly influenced seed germination and seedling growth of sweet sorghum. Under NaCl stress, sweet sorghum salt uptake increased via improved enzyme activities and osmoregulation during seed germination and bud seedling growth stages. Under NaCl stress, there was a little ability for sweet sorghum to resist salt by improving enzyme activity and osmoregulation substance during seed germination and seedling growth stage. Lowest root POD activity, highest leaf MDA accumulation, leaf soluble sugar and leaf POD under 100 mmol·L-1 NaCl stress indicated the greatest salt damage to sweet sorghum. N treatments without NaCl markedly affected seed germination and seedling growth of sweet sorghum. Sweet sorghum seedling grew best under 20 mmol(N)·L-1 due to lessening cell damage by NaCl. NH4Cl improved more than KNO3 in seed germination and seedling growth of sweet sorghum. Under 100 mmol·L-1 NaCl stress, supplementation with either form of the two N sources (NH4+ and NO3-) ameliorated adverse salt stress effects on seedling growth and examined physiological traits. This was possible by improving POD activity and reducing MDA accumulation. It was evident that an appropriate nitrogen fertilizer application improved the salt tolerability of sweet sorghum.关键词
甜高粱/盐胁迫/氮源/发芽/幼苗生长/生理特性Key words
Sweet sorghum, Salt stress, Nitrogen source, Seed germination, Seedling growth, Physiological trait分类
农业科技引用本文复制引用
穆静,刘小京,徐进,毛任钊,魏巍,杨莉琳..氮素对NaCl胁迫下甜高粱种子萌发及芽苗生长与生理的影响[J].中国生态农业学报,2012,20(10):1303-1309,7.基金项目
国家科技支撑计划项目(2009BADA7B05)和公益性行业(农业)科研专项经费项目(200903001-7)资助 （2009BADA7B05）
