|Table of Contents|

Effects of Saline-Alkali Stress on Physiology and Photosynthetic Characteristics of Rape Seedlings

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Issue:
2020年15
Page:
1-8
Research Field:
Publishing date:

Info

Title:
Effects of Saline-Alkali Stress on Physiology and Photosynthetic Characteristics of Rape Seedlings
Author(s):
YANG Yang1; WANG Yajuan1; YIN Fating1; ZHANG Fenghua2
(1.School of Agriculture，Shihezi University，Shihezi，Xinjiang 832003;2.Key Laboratory of Oasis Ecological Agriculture of Xinjiang Bingtuan，Shihezi University，Shihezi，Xinjiang 832003)
Keywords:
rapeseed seedling stage; saline-alkali stress; osmotic adjustment; protective enzyme; photosynthetic gas exchange parameters
PACS:
-
DOI:
10.11937/bfyy.20194532
Abstract:
Huayouza 62’ was used as the test material，and the potting method was used to study the effect of compound saline-alkali stress on the seedling physiology and photosynthetic characteristics of ‘Huayouza 62’ rape，in order to provide a theoretical basis for the cultivation of rape in saline-alkali land.The results showed that under the compound saline-alkali stress, the soluble sugar and proline content in the leaves of rape seedlings were significantly lower in the severe treatment than in the mild treatment, and the content in the late seedling stage was higher than that in the early stage; the soluble protein content was moderate to severe in the early stage The treatment was significantly higher than the light treatment, and the late seedling stage was lower than the early seedling stage. The protective enzyme activities in the leaves of rape seedlings decreased to varying degrees, but the differences were not significant among the treatments.The activities of SOD and POD were lower than those of the pre-emergence stage in the late seedling stage，and the activity of CAT was higher than that of the pre-emergence stage in the later seedling stage.As the salinity increased，the net photosynthetic rate (Pn)，transpiration rate (Tr)，intercellular CO2 concentration (Ci)，and stomatal conductance (Gs) of rapeseed seedlings all showed a trend of decreasing first and then increasing.Compound saline-alkali stress on the content of osmotic adjustment substances (soluble sugar，proline，soluble protein)，enzyme activity (SOD，POD，CAT) and photosynthetic parameters (net photosynthetic rate (Pn)，transpiration rate (Tr)，intercellular CO2 concentration (Ci)，stomatal conductance (Gs)) had an inhibitory effect，and as the degree of salinity increases，the inhibitory effect was enhanced;the degree of inhibition in the early stage of rapeseed was greater than that in the late stage of seedling，and the photosynthetic capacity of rapeseed was weakened in the late stage of seedling，enzyme activity in the body was reduced，but it could adapt to adversity by synthesizing osmotic adjustment substances.

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Last Update: 2020-09-16