5681

5304

كارشناسي ارشد

خاكشناسي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده كشاورزي

1389

چهارده،110ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

اميرحسين خوش گفتارمنش

نعمت اله اعتمادي

17/12/89

محمدعلي حاج عباسي، علي نيكبخت

1397/08/02

كتابنامه

مهندسي كشاورزي

ID5304

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Severity of Chlorosis in Plane tree Platanus orientelis L of Isfahan Green space in Relation with Some Physicochemical Soil Properties and Physiological Indices of Active Fe in Plant Maedeh Alsadat Mirlohi Email address mm bluesky@yahoo com Date of submission 2 11 2010 Department of Soil Science Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Supervisors Amirhossein Khoshgoftarmanesh Assoc Prof amirhkhosh@cc iut ac ir Mehran Shirvani Assist Prof shirvani@cc iut ac ir Abstract Iron chlorosis is one of the most important nutritional problems observed in plants especially in ornamental and fruit trees grown in calcareous soils In Isfahan presence of severely chlorotic plane trees Platanus orientalis undesirably affects the streets and parks views The purpose of this study was to find the reasons of iron chlorosis in plane trees During the years 1387 and 1388 73 plane trees in different regions of Isfahan city with different soil properties and chlorosis intensities were selected and young and mature leaves were sampled from each tree Activity of glutathione peroxidase GPX and Fe Cu Zn carotenoids and chlorophylls concentrations were determined in mature and young leaves from both sampling years Soil sampling of 0 30 30 60 and 60 90 cm depths was also performed and soil properties such as pH and EC as well as concentration of HCO3 Cl Ca Mg K Na Fe Cu Zn and Mn were determined The results didn t confirm any relation between iron concentration and chlorosis intensity of the leaves In the first year there was a significant relation between Fe and Zn concentrations in young leaves Iron concentration in the mature leaves had a significant relation with GPX enzyme activity There was also a negative relation between Fe concentration in mature leaves and EC and Cl concentration in 30 60 cm depth of soils Iron concentration of young leaves sampled in the second year had significant relation with leaf Zn and Cu concentrations There was also a relation between Fe concentration of mature leaves and GPX enzyme activity in the second year of study Multiple regression analysis showed that leaf P concentration had the most negative effect on Fe concentration in mature leaves of the second year In both years P concentration and P Fe ratios of young leaves was higher than those of the mature leaves The GPX enzyme activity was strongly related to Fe concentration in mature leaves that shows the important role of Fe in GPX enzyme activity It is suggested that P Fe ratio and GPX activity be used for diagnosing of Fe chlorosis of plane trees The mean concentration of available Fe in the soils supporting the trees with most severe intensity of chlorosis was less than those supporting the trees with low intensity of chlorosis There was no relation between Fe concentration in plane tree leaves and available Fe in soils or soil pH values In sampling areas with severely chlorotic trees bicarbonate concentration in 0 30 cm of soil depth was more than those with gently chlorotic trees Based on the results of this research it seems that the main reason of plane tree chlorosis in Isfahan green space is deficiency of available Fe in soil and low Fe activity in leaves as a result of high Cu and P concentration The GPX activity and a and b chlorophyll concentrations can be used as indicators for diagnosing of Fe chlorosis in plane trees Also P Fe ratio in the leaves is a good indicator for detecting Fe chlorosis in these trees Key world Enzyme Plane tree Iron Chlorophyll chlorosis

اميرحسين خوش گفتارمنش

نعمت اله اعتمادي

محمدعلي حاج عباسي، علي نيكبخت