Behnamfar, K., Orsham, A., Salehe Shoshtari, M., Tavousi, M., danaie, A., Adel, J. (2019). Determination of tolerance to below-zero temperatures in Prosopis juliflora using physiological indices. , 26(1), 49-61. doi: 10.22092/ijrdr.2019.119326
Kourosh Behnamfar; Aziz Orsham; Mohamad Hasan Salehe Shoshtari; Mehrzad Tavousi; Abdolreza danaie; jamaladdin Adel. "Determination of tolerance to below-zero temperatures in Prosopis juliflora using physiological indices". , 26, 1, 2019, 49-61. doi: 10.22092/ijrdr.2019.119326
Behnamfar, K., Orsham, A., Salehe Shoshtari, M., Tavousi, M., danaie, A., Adel, J. (2019). 'Determination of tolerance to below-zero temperatures in Prosopis juliflora using physiological indices', , 26(1), pp. 49-61. doi: 10.22092/ijrdr.2019.119326
Behnamfar, K., Orsham, A., Salehe Shoshtari, M., Tavousi, M., danaie, A., Adel, J. Determination of tolerance to below-zero temperatures in Prosopis juliflora using physiological indices. , 2019; 26(1): 49-61. doi: 10.22092/ijrdr.2019.119326

Determination of tolerance to below-zero temperatures in Prosopis juliflora using physiological indices

تحقیقات مرتع و بیابان ایران
Article 6, Volume 26, Issue 1, June 2019, Pages 49-61    PDF (373.93 K)
Document Type: Research Paper
DOI: 10.22092/ijrdr.2019.119326
Authors
Kourosh Behnamfar* 1; Aziz Orsham2; Mohamad Hasan Salehe Shoshtari3; Mehrzad Tavousi4; Abdolreza danaie5; jamaladdin Adel6
1Assistant Professor, Forests and Rangelands Research Department, Khuzestan Agricultural and Natural Resources Research and Education Center (AREEO), Ahvaz, Iran
2Research Instructor, Soil Conservation and Watershed Management Research Department, Khuzestan Agricultural and Natural Resources Research and Education Center (AREEO), Ahvaz, Iran
3Research Expert, Forests and Rangelands Research Department, Khuzestan Agricultural and Natural Resources Research and Education Center (AREEO), Ahvaz, Iran
4Senior Research Expert, Seed and Plant Improvement Research Department, Khuzestan Agricultural and Natural Resources Research and Education Center, Agricultural Research, Education and Extension Organization (AREEO), Ahwaz, Iran
5Senior Expert, Natural resources and watershed Office, Ahvaz, Iran
6Senior Research Expert, Forests and Rangelands Research Department, Khuzestan Agricultural and Natural Resources Research and Education Center (AREEO), Ahvaz, Iran
Abstract
The occurrence of below-zero temperatures in recent winters in Khuzestan province has caused the freezing of Prosopis juliflora trees. The aim of this study was to determine the sensitivity of this species to freezing under zero temperatures. In this study, a split split plot was used in a completely randomized design with six replications. In order to apply the treatments, the branches of elderly trees and two-year old seedlings were considered as main treatment; below-zero temperatures (-1-, -3, -5 and 7 ° C) as the first sub treatment; and different times (1, 2, 3 and 4 hours) as the second sub-treatment. The amount of electrolyte leakage from the membrane of leaf and stem cells was measured and, based on this, LT50 was calculated. The chlorophyll (II) fluorescence and photosynthesis efficiency of the leaves were measured as indicators for determining the damage to frost. The results showed that there was no significant difference for all traits between branches of the old trees and two-year-old seedlings. The percentage of electrolyte leakage from leaf and stem increased significantly with decreasing temperature. The LT50 occurred at -5 ° C after three hours. At -7 ° C, after the first hour, LT50 occurred in the leaves and after the third hour in the stems. After freezing stress, the Fv/Fm decreased significantly. After two hours at -1°C, Fv/Fm did not change significantly but in three hours Fv/Fm decreased from 0.64 (in control) to about 0.48. It reached to 0.15 after applying four hours at -7°C.
Keywords
Prosopis juliflora; electrolyte leakage; chlorophy(ӀӀ) fluorescence; LT50; Fv/Fm
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