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Paper Information

Journal:   IRANIAN JOURNAL OF BIOLOGY   Fall 2003 , Volume 15 , Number 3; Page(s) 43 To 48.
 
Paper: 

A SURVEY COMPARING DESICCATION TOLERANCE IN RESURRECTION PLANT NOTHOLAENA VELLEA (AIT.) DESF. AND STUDYING ITS PROTEIN PROFILE DURING DROUGHT STRESS AGINST A NON RESURRECTION PLANT NEPHROLEPSIS SP

 
 
Author(s):  GHASEMPOUR H.R., MALEKI M.
 
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Abstract: 
The greatest effect of drought is desertification, which is because of the lack of rain in some regions and mans over-exploitation in semi-arid and arid regions of the world. One approach to control this problem is to grow plants with the ability to withstand drought. Among vascular plants which are desiccation tolerant, there are a group of flowering plants and ferns, which can survive water deficits down to completer air- dryness, and which, when they rehydrate, resume normal physiological function. Such plants are referred to as resurrection plants. By producing transgenic plants if resurrection plants gene with such ability be transferred, we can avoid or reduce the damage of drought by their cultivation in such harsh environments. In this study, N. vellea a resurrection plant in controlled environmental chamber met a period of drougt stress up to complete dehydration and were dehydrated again, which resumed its physiological functions as soon as rehydrate. Non resurrection plant nephrolepsis did not recover and died.
By using the method of cell viability tests (Levitt, 1960) dehydrated resurrection plant cells were viable up to 0% RWC. Total protein measurements of non resurrection plants during dehydration showed loss of proteins but the resurrection plants didn't show such a loss. Protein profile studies of both plants were different. In non resurrection plant some bonds were reduced or deleted but in resurrection plant some new bonds we appeared and some were reduced or increased. This might be and indication of enzyme changes in resurrection plants during dehydration up to complete dryness. These proteins, probably are proteins that by synthesis of soluble sugars resume the ability of desiccation tolerance in resurrection plants. Also, the study of soluble sugar contents in protoplasmic drougt tolerant plants, were in accordance with the vitreous state theory of membrane protection.
 
Keyword(s): DESICCATION, PROTEIN, SOLUBLE SUGAR, RESURRECTION PLANT, NOTHOLEANA VELLEA (AIT) NEPHROLEPSIS SP
 
References: 
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