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Paper Information

Journal:   JOURNAL OF AGRICULTURAL SCIENCES   2006 , Volume 12 , Number 1 (SUPPLEMENT); Page(s) 187 To 199.
 
Paper: 

INVESTIGATION OF ICE NUCLEATION ACTIVITY OF BACTERIA ON DIFFERENT GENOTYPES OF ALMOND TREES IN ZARGHAN AREA OF FARS PROVINCE

 
 
Author(s):  KETABCHI SAGHAR, HASAN ZADEH N., MOHAMMADI M., ALI ZADEH ALI ABADI A., SAADAT Y.A.
 
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Abstract: 

One of the factors which increase cold tension in the plants is ice nucleation activity (INA) of bacteria that produce biological ice nuclei which leads to frosting at higher temperature. In this study four genotypes of almond trees were selected and examined in Zarghan agricultural research center, in Fars province. The four genotypes were 36 (early-flowering), 5 (too early flowering), 26 (mid-late flowering) and 8 (too late-flowering). First, the INA+ bacteria isolated from buds, blossoms, immature fruits & leaves were characterized according to standard bacteriological methods. There after their population densities were determined separately during the months of February, March, April and May, 2002-2003. The strains from Pseudomonas syringae, Pseudomonas fluorescens, Pantoea agglomerans and Xanthomonas spp. were identified as INA+ bacteria. To P.syringae was the most prevalent bacterium and P.agglomerans, P.fluorescens and Xanthomonas spp. were ranked second to the fourth, respectively. Bacterial population changed completely depending on the phenology of the plants and the temperature. Moderate temperatures of February and March, induced early flowering almond genotypes to blossom in Zarghan area of Fars province. Since population of epiphytic INA+ bacteria on almond trees will be increased by moderate temperature and adequate nutrition, any decrease in temperature will intensify on frost injury of almond trees. It was concluded selected almond genotypes, weather condition and population of INA bacteria are the most effective factors in frost damage of Zarghan area.

 
Keyword(s): ICE NUCLEATION ACTIVITY BACTERIA, ALMOND, PSEUDOMONAS SYRINGAE, PSEUDOMONAS FLUORESCENS, PANTOEA AGGLOMERANS, XANTHOMONAS SPP
 
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