应用生态学报2012，Vol.23Issue(3)：625-631,7.
NaCl和Na2CO3胁迫对桑树幼苗生长和光合特性的影响
Effects of NaCl and Na2CO3 stresses on the growth and photosynthesis characteristics of Morus alba seedlings
摘要
Abstract
Taking 1 -year old Morus alba variety ' Qinglong' seedlings as test materials, this paper studied their growth and photosynthetic characteristics under the stresses of different concentration neutral salt NaCl and alkali salt Na2CO3 Salt stresses decreased the plant height and the leaf number, biomass, and photosynthetic capacity of the seedlings markedly. With increasing concentration Na+, the leaf stomatal conductance, transpiration rate, net photosynthetic rate, actual photochemical efficiency, electron transport rate, and photochemical quenching (qp) decreased obviously, the energy dissipation rate increased, and the light use efficiency and photosynthetic capacity dropped down. At low concentrations Na+ ( <150 mmol · L-1 ) , the seedlings growth and leaf photosynthetic capacity were slightly inhibited, and the adaptability of the seedlings to the salt stresses increased via the increase of root/shoot ratio. However, this protection mechanism was impaired by increasing salt concentration. Na2CO3 stress ( Na+ concentration > 50 mmol · L-1) had stronger inhibitory effects on the seedlings growth and leaf photosynthetic capacity, and the effect increased with increasing Na+ concentration. It was concluded that at Na+ concentration <150 mmol · L-1, the photosynthetic adaptability of M. alba to neutral salt stress was mainly dependent on the plant morphology and photosynthetic metabolism, but at Na+ concentration >150 mmol · L-1, the photosynthetic adaptability of M. alba to alkali salt stress was mainly dependent on the photosynthetic metabolism.关键词
桑树/NaCl和Na2CO3胁迫/光合特性Key words
Morus alba/ NaCl and Na2CO3 stresses/ photosynthetic characteristics分类
农业科技引用本文复制引用
张会慧,张秀丽,李鑫,丁俊男,朱文旭,齐飞,张婷,田野,孙广玉..NaCl和Na2CO3胁迫对桑树幼苗生长和光合特性的影响[J].应用生态学报,2012,23(3):625-631,7.基金项目
国家自然科学基金项目(30771746,31070307)、黑龙江省自然科学基金重点项目(ZD201105)、"十二五"国家科技支撑计划项目(2011BAD08B02-3)、黑龙江科技攻关重大项目(GA09B201-02)和东北林业大学学术名师支持计划项目(2010)资助. （30771746,31070307）
