摘要
采用温室盆栽控制试验,研究0,120,240和360 mmol·L-1NaCl胁迫对沙枣幼苗生长、生物量累积与分配以及光合气体交换参数的影响,并分析生长与光合参数间的相关性。结果表明:1)不同浓度NaCl胁迫幼苗的株高净增长、侧枝数、叶生长参数、生物量累积均低于或显著低于对照,且均随盐胁迫浓度的升高呈下降趋势,而根冠比和根生物量百分比依次增加;2)随NaCl胁迫的加剧,净光合速率(P n)、气孔导度(G s)、胞间CO2浓度(C i)和蒸腾速率(Tr)依次下降,而气孔限制值(L s)和水分利用效率(WUE)依次增加,360 mmol·L-1盐胁迫幼苗的P n,G s,C i,Tr,L s和WUE分别为对照的57.2%,22.7%,62.8%,38.1%,200%和150%;3)盐胁迫强度与株高、叶生长参数、生物量累积以及光合参数呈极显著负相关,叶片的光合参数与生长参数呈显著或极显著正相关,而叶片的生长指标、光合参数与幼苗的生物量累积和分配也有显著或极显著相关性。综合分析认为,NaCl胁迫直接影响沙枣幼苗的生长和光合生理,叶片的光合能力对生长参数具有显著影响,并最终影响植株的生物量累积。
A pot experiment in greenhouse was conducted to investigate the effects of 0 （control）,120,240 and 360 mmol · L-1 NaCl treatments on growth,biomass accumulation and allocation,and photosynthetic gas exchange parameters of Elaeagnus angustifolia seedlings,and the correlations between growth parameters and photosynthetic parameters were also analyzed.The results showed that：1） net height increment,branch number per plant,other growth parameters and biomass accumulation of NaCl-stressed seedlings were all lower or significantly lower than those of the control.With the salt concentration elevated,the above-mentioned growth parameters exhibited a decreasing trend,whereas the root-shoot ratio and root biomass allocation ratio both increased consecutively.2） With the salt stress aggravated,net photosynthetic rate （Pn）,stomatal conductance （Gs）,intercellular CO2 content （Ci） and transpiration rate （Tr） generally exhibited a decreasing trend,while stomatal limitation value （Ls） and water use efficiency （WUE） had an increasing trend.Pn,Gs,Ci and Tr of 360 mmol · L-1 NaCl-treated seedlings were only 57.2%,22.7%,62.8%,38.1% of the control,respectively,whereas the Ls and WUE of the same stressed seedlings were 2.0 and 1.5 times higher than that of the control.3） Plant height,various leaf growth parameters,whole-plant biomass accumulation and various photosynthetic parameters had all extremely significant and negative correlations with salt stress intensity.Various leaf photosynthetic parameters were significantly or extremely significantly correlated with leaf growth parameters,and there were also significant or extremely significant correlations between parameters of leaf growth and photosynthesis and parameters of biomass accumulation and allocation.In conclusion,our findings suggested that growth and photosynthetic physiology of E.angustifolia seedlings were directly inhibited by NaCl stress,and there were also interactions between leaf photosynthetic capacity and leaf growth parameters,all these factors ultimately brought about a decrease in plant biomass accumulation.
出处
《林业科学》
EI
CAS
CSCD
北大核心
2014年第1期32-40,共9页
Scientia Silvae Sinicae
基金
国家"十二五"科技支撑计划项目(2011BAD38B0102)
中央级公益性科研院所基本科研业务费专项资金项目(CAFYBB2011005-5)
关键词
沙枣
NACL胁迫
生长
光合特性
Elaeagnus angustifolia
NaCl stress
growth
photosynthetic characteristics
