摘要
通过砂培试验,研究了不同浓度NaCl(0、100、200、300和400mmol·L-1)处理对高纬度移植桐花树幼苗生物量、离子吸收、碳氮代谢、叶片光合色素和叶片抗氧化系统的影响.结果表明:100mmol·L-1NaCl处理对桐花树生长有轻微的促进作用,当NaCl浓度达到300mmol·L-1时,桐花树根、茎、叶器官的干鲜质量、根冠比、株高和基径均显著下降.高盐胁迫抑制了叶片抗氧化系统中超氧化物歧化酶(SOD)和过氧化物酶(POD)的活性,提高了丙二醛含量,降低了叶片中叶绿素、类胡萝卜素总量以及根茎叶的可溶性总糖和游离氨基酸总量.不同浓度NaCl胁迫下,桐花树根茎叶中Na+含量快速上升,K+含量相对下降,K+/Na+快速下降,导致各器官中离子平衡失调.当NaCl浓度高于300mmol·L-1时,桐花树根茎叶的碳氮代谢运转失调,抑制了植株的正常生长,导致各器官的生物量显著下降.
A sand culture pot experiment was conducted to study the eco-physiological responses of high-latitude transplanted mangrove Aegiceras corniculatum seedlings to varying concentration of NaCl （0, 100, 200, 300, and 400 mmol·L-1）. Under the stress of 100 mmol NaCl·L-1, the seedling growth was slightly promoted; whereas at 300 mmol NaCl·L-1, the plant height, stem basal diameter, fresh and dry mass, and root/shoot ratio were decreased significantly. High salt stress inhibited the leaf superoxide dismutase （SOD） and peroxidase （POD） activities, increased the leaf malondialdehyde （MDA） content, and decreased the leaf chlorophyll and carotenoids contents as well as the total soluble sugar and free amino acid contents in different organs. Under the stress of different concentration NaCl, the Na＋ contents in leaf, stem, and root increased rapidly while the K＋ contents had a relatively decrease, resulting in a rapid decrease of K＋/Na＋ ratio and an imbalance between K＋ and Na＋ in A. corniculatum vegetative organs. When the NaCl concentration in the medium was higher than 300 mmol·L-1, the C and N metabolism of A. corniculatum vegetative organs was maladjusted, which inhibited the normal growth of the seedlings, resulting in a significant decrease in the plant height and fresh and dry mass.
出处
《应用生态学报》
CAS
CSCD
北大核心
2011年第9期2279-2284,共6页
Chinese Journal of Applied Ecology
基金
国家海洋公益性行业科研专项(200805072
201005012)
联合国开发计划署-全球环境基金项目(CPR/SGP/OP4/Y3/RAF/2010/08)
浙江省近岸水域生物资源开发与保护重点实验室开放项目(2010F30003)
浙江省科技厅创新团队建设与人才培养项目(2009F20009)
浙江省海洋与渔业项目"高纬度红树林生态恢复关键技术应用示范"资助
关键词
高纬度移植
桐花树
NACL
胁迫
生理生态效应
high-latitude transplanting
Aegiceras corniculatum
NaCl stress
eco-physiological responses
