With two salttolerant rice varieties and two saltsensitive varieties as material, the influence of salt stress on plant biomass accumulation, photosynthetic characteristics and the other physiological characteristics was studied. The results showed that the dry weight and fresh weight of shoot and root of salttolerant rice varieties and saltsensitive varieties were declined under salt stress. The fresh weight of shoot and dry weight of roots were declined significantly. The net photosynthetic rate, stomatal conductance, transpiration and apparent mesophyll conductance were declined to different degrees under salt stress. The drop of Pn, Gs, Tr and Pn/Ci of salttolerant varieties was less than saltsensitive varieties. The water use efficiency(WUE) of salttolerant varieties was higher than that of saltsensitive ones at the same time. The intercellular CO2 concentration (Ci) of salttolerant varieties and saltsensitive ones was not changed obvirously under salt stress. The stomatal limitation percentage (Ls) under salt stress was low and the difference among the varieties was not significant. And apparent mesophyll conductance (Pn/Ci) was changed significantly. The decline of Pnresulted from the decline of RuBPCase rather than from stomatal limitation. The permeability regulation substance contents of leaf and root such as soluble sugar and proline, total amino acids were increasd under salt stress with significant increase in soluble sugar contents (P < 0.01). The protective enzyme SOD, POD and CAT activities were enhanced, as well as the membrane permeability and the MDA content, the root vigor was declined under salt stress.
XU Chen1， LING Fenglou2， XU Kezhang2， WU Zhihai2， LIU Xiaolong2， AN Jiuhai2， ZHAO Lanpo3,*
. Effect of Salt Stress on Photosynthetic Characteristics and Physiological and Biochemical Traits of Different Rice Varieties[J]. Chinese Journal OF Rice Science, 2013
, 27(3)
: 280
-286
.
DOI: 10.3969/j.issn.10017216.2013.03.008
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