摘要
设计盐梯度(0,2‰,4‰,6‰,8‰盐溶液的质量比为NaCl:Na2SO4:NaHCO3=75%:15%:10%)试验分析沼泽小叶桦生理表现和叶片解剖结构。结果显示:在低于4‰盐度时沼泽小叶桦能正常生长,6‰盐度时沼泽小叶桦生长发育不良,当盐度8‰时沼泽小叶桦只能存活30天左右;在低盐度处理下沼泽小叶桦光合生理表现和叶片解剖结构正常;随着盐度增加,其叶片净光合速率、气孔导度、胞间CO2浓度、蒸腾速率、叶绿素含量等指标均下降,而叶片中可溶性糖含量、脯氨酸含量、蛋白质含量升高;当盐度≥0.4%时,沼泽小叶桦叶片栅栏细胞逐渐纵向伸长且排列更紧密,叶绿体从椭圆形变成球形,叶绿体中出现粗大的淀粉粒和脂质球,表明其对滨海盐土具有一定的适应能力。
Betula microphylla var.paludosa is a salt tolerant plant and naturally grows in inland.In order to explore possibility in transplanting the species to marine salina,we investigated photosynthetic performance and leaf anatomic structure of B.microphylla,grown under control（nutrient soil） or salt-stress conditions（nutrient soil containing different salinity：2‰,4‰,6‰,8‰ of the solution for 60 days.The species had normal photosynthetic performance and leaf anatomic structure under lower salinity conditions.When soil salinity increased（≥0.4%）,the net photosynthesis rate,stomatal conductance,transpiration rate,internal CO2 concentration,and chlorophyll content in leaves all decreased,whereas the soluble sugar,proline and protein contents of leaf increased.Accordingly,cells of the palisade tissue in B.microphylla var.paludosa leaf elongated and piled closely,in comparison with that under lower salinity conditions,and the chloroplasts changed from elliptical shape to round shape and in which many 1ipid droplets and starch grains occurred in it.These results indicated that B.microphylla var.paludosa could tolerate salt-stress through modifying leaf physiological and morphological traits,reflecting an adapting potential to saline.
出处
《林业科学》
EI
CAS
CSCD
北大核心
2011年第10期29-36,共8页
Scientia Silvae Sinicae
基金
上海市科技支撑项目(08231200802)
住建部"十一五"科技支撑项目(2008BAJ10B0403)
林业公益性行业科研专项(201104088)
关键词
沼泽小叶桦
盐胁迫
净光合速率
可溶性糖
显微结构
超微结构
Betula microphylla var.paludosa
salt stress
net photosynthesis rate
soluble sugar
microscopic structure
ultrastructure
