Document Details

Document Type : Thesis 
Document Title :
Effect of Habitat Variations on Growth and Some Metabolic Activities of Two Different Plant Life-Forms in Makkah Region
تأثير اختلافات الموطن على النمو وبعض الأنشطة الأيضية لطرازين نباتيين مختلفين في منطقة مكة
 
Subject : College of Science for Girls 
Document Language : Arabic 
Abstract : The present study aimed to reveal the effect of some spatial and temporal variations in some characters correlated with growth and metabolic activities of three common plant species representing two different life forms wildly grown in three diverse habitats in Makkah region. Explicitly, the objective was to provide some evidences on the responsibility of variation in some morphological characters, photosynthetic pigments and synthesis as well as storage of carbohydrates and proteins in achieving the desert plants to cope with aridity. Two life forms; perennial shrubs and annuals were selected for the current study. The first life form was symbolized by only one species; Rhazya stricta Decne. while the second was represented by Tribulus longipetalus Viv. and Tribulus terrestris L.. Habitat diversity (Plain, Wadi & Mountain) was associated with moisture availability, salinity levels and different soil characters. Plain attained the highest moisture availability and lowest salt stress, Wadi received runoff from bordering ridges which go deep due to sandy soil, Mountains as expected lose some of the rain water by runoff, but holds in its notches an amount adequate enough for growth of some species. The Measurements of some morphological characters was significantly reduced in R. stricta grown in Mountains compared to that of wadis and plains. Furthermore, abundance measurements mainly represented by plant density, frequency and cover attained their maximum and minimum measurements in wadi and mountain respectively. Concerning the second life form (annuals) T. longipetalus attained their maximum growth in plain while the minimum was achieved in wadi during the two phenological stages of growth. On the other hand, T. terrestris grow better in mountain than wadi and completely disappeared in plain. The water content in most plant organs of the perennial shrub R. stricta attained their highest values in plain habitat and lowest values in the others habitat. Contrarily, the two annual species attained their highest water content in wadi. Regarding plant biomass, the perennial shrub; R. stricta exhibited its maximum for most plant organs in plain and minimum in mountains. On the other hand, the annual species; T. longipetalus and T. terrestris attained their minimum biomass in wadi while the maximum was achieved in plain and mountain (the most suitable habitats for growth) for the first and second species respectively. The content of the photosynthetic pigments (chl a, chl b and caro.) in leaves of the studied plant species was significantly affected by habitat conditions. Commonly, the annual average concentration of carbohydrates varied with habitat and life form. In the perennial shrub the concentration were higher in plain and wadi in all different phenophases. In annual species the content of carbohydrates were higher in mountains and wadi. The annual species attained higher concentrations of total available carbohydrate (TAC) than in perennial one, the opposite trend in case of total soluble sugars (TSS) except in roots. The protein content in perennial shrub was higher than that in annual species. The content of total and soluble proteins in the studied life forms varied from one habitat to another. The present study showed that there is a significant difference between two annual species in the formation of protein through the two different phenophases. The studied life forms showed great difference in carbohydrate to protein ratio (C/P). While annuals exhibited the highest ratio, perennial shrub exhibited the lowest one. (C/P) differed from one habitat to another especially in the perennial shrub R. stricta and also differed with different phenophases especially in the annual species. High ratios were attained in roots and branches while the low ones were attained in leaves. 
Supervisor : dr. 
Thesis Type : Master Thesis 
Publishing Year : 1431 AH
2010 AD 
Added Date : Tuesday, May 11, 2010 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
منى عبد الرحمن المالكيAL-Malki, Muna Abdul-RahmanResearcherMaster 

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