蓖麻耐盐性的初步研究

蓖麻为优良耐盐能源植物,但其耐盐程度尚无明确结论.为此,测定了不同盐度胁迫条件下(0、10、20、30、40、50、60dS/m)蓖麻的生长情况及生理指标.结果表明,蓖麻在ECe=0～30dS/m时,能正常萌发、生长并结实;ECe=40dS/m时,能萌发但不能存活;ECe=50、60dS/m时,发芽率为0.蓖麻生物量积...

Preliminary Study of Salt-tolerant of Castor

Castor is an excellent salt-tolerant energy plant,but the level of salt-tolerance is uncertain.In order to explore its salt-tolerance,this article tested the growth and physiological indices of castor under different salt stress(0,10,20,30,40,50,60 dS/m ECe).The results showed that,the germination,growth and fructification was normal when the ECe was 0~30 dS/m,it could germinate but could not growth if the ECe was 40 dS/m,and the germination rate was zero when the ECe was 50,60 dS/m;Salt stress inhibited the biomass accumulation of castor significantly,but it had certain promotion effect if the ECe was 10 dS/m,and the biomass reduced obviously when the ECe was 20 dS/m or more;With the increase of the ECe,the content of chlorophyll a(Chla),chlorophyll b(Chlb),the ratio of Chla/Chlb,net photosynthetic rate(Pn),transpiration rate(Tr),stomatal conductance(Gs) and intercellular space CO2 concentration(Ci) reduced;and those were lower in August than July in the same salinity;Maximum photochemical quantum yield(Fv/Fm) and effective photochemical quantum yield change were not significant in a short time,but they were reduced with the increase of NaCl concentration and the extend of treatment time;The photochemical fluorescence quenches coefficient(qP) rised in advance then falls,the activity of PSⅡ reduced under salt stress of the castor eventually.Therefore,germination rate,biomass,Pn,Tr,Ci,Gs,Fv/Fm,qP and yield could be used as the important indices to evaluate salt-tolerance of castor.This study provided the reference that exploitation and utilization of castor in saline-alkali land.