|Table of Contents|

Response on Growth and Physiological Characteristics of Melon Seedlings Under Alkali Stress

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Issue:
2020年07
Page:
51-59
Research Field:
Publishing date:

Info

Title:
Response on Growth and Physiological Characteristics of Melon Seedlings Under Alkali Stress
Author(s):
SUN Xiaohua1; DONG Xiaojing2; LI Xiaojing1; CHEN Li3; LIU Jiecai1
(1.College of Horticulture and Plant Conservation,Inner Mongolia Agricultural University/Inner Mongolia Engineering Research Center of Facility Horticulture,Hohhot，Inner Mongolia 010019;2.College of Horticultural Science and Engineering,Shandong Agricultural University,Tai′an，Shandong 271018;3.Ulanqab Center for Quality and Safety Supervision and Management,Ulanqab，Inner Mongolia 012000)
Keywords:
‘Horn crisp’ muskmelon; alkali stress; growth potential; photosynthetic characteristics; oxidation resistance
PACS:
-
DOI:
10.11937/bfyy.20193457
Abstract:
The growth potential,photosynthetic indexes,chlorophyll contents,chlorophyll fluorescence parameters and antioxidant enzyme activities of ‘Horn crisp’ muskmelon (Cucumis melo L.) annual seedlings was measured under treatments with different Na2CO3 concentrations (0 as the control,12.5,25.0,37.5,50.0,62.5,75.0 mmol·L-1),in order to provide theoretical basis for the research on the adaptive mechanism of muskmelon seedlings under alkali stress.The results showed that seedling height,stem diameter and leaf area significantly decreased under 75.0 mmol·L-1 Na2CO3 treatment,compared with the control.With the gradual increase of Na2CO3 concentration in treatments,the net photosynthetic rate (Pn) of the seedlings decreased,whereas the intercellular CO2 concentration (Ci) increased;the chlorophyll (Chl) content showed a decreasing trend,the malondialdehyde (MDA) content,however,was elevating,whereas the free proline (Pro) content increased sharply under high concentration of Na2CO3.The enzyme activity of superoxide dismutase (SOD) and peroxidase (POD) under treatment were significantly higher than the control.The decrease of Pn of seedlings may be a result of non-stomatal restriction.Under high concentration (75.0 mmol·L-1) alkali stress,the growth potential of melon seedlings was impaired,whereas the significantly increased MDA content and accumulation of Pro might have enhanced the resistance of melon seedlingsto alkalinity in later stage.

References:

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Last Update: 2020-07-03