EFFECTS OF PRE-HARVEST APPLICATION OF DIFFERENT NITRATE TO AMMONIUM RATIOS AND CALCIUM LEVELS ON SUSCEPTIBILITY OF CUT ROSE FLOWERS TO GRAY MOLD CAUSED BY BOTRYTIS CINEREA

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KIANI SH.; ALIZADEH A.; MALAKOUTI M.J.; ZADEH DABAGH GH.; TABATABAEI S.J.

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Journal: IRANIAN JOURNAL OF PLANT PATHOLOGY Year:2008 | Volume:44 | Issue:1 (173) Page(s): 73-92

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Title

EFFECTS OF PRE-HARVEST APPLICATION OF DIFFERENT NITRATE TO AMMONIUM RATIOS AND CALCIUM LEVELS ON SUSCEPTIBILITY OF CUT ROSE FLOWERS TO GRAY MOLD CAUSED BY BOTRYTIS CINEREA

Author(s)

Keywords

GRAY MOLDQ3

BOTRYTIS CINEREAQ3

ROSE FLOWERQ3

ROSA HYBRIDA L.Q3

NITRATE TO AMMONIUM RATIOQ2

CALCIUMQ2

Abstract

GRAY MOLD of ROSE FLOWERs caused by BOTRYTIS CINEREA is considered to be one of the major problem in greenhouse rose production all over the world including in Iran. Three hydroponic experiments were conducted to elucidate the effect of NITRATE TO AMMONIUM RATIO and CALCIUM concentration on susceptibility of ROSE FLOWERs to GRAY MOLD at Safi Abad Agricultural Research Center. On the basis of results from the first and second experiments, a moderately virulent isolate with proper conidial concentration (104 spore/ml) was selected for inoculation of ROSE FLOWERs. The third experiment was carried out as factorial in a randomized complete block design with four replicates. In this experiment, rose plants were grown with three NITRATE TO AMMONIUM RATIOs (100/0, 75/25 and 50/50) in combination with Ca two levels (1.6 and 4.8 mM). ROSE FLOWERs from two consecutive harvesting dates were sprayed with the conidial suspension (104 spore/ml) of the selected B. cinerea isolate. At the end of experiment, the disease severity was recorded and analyzed. The results revealed that increased NHH+ concentration up to 50% of applied nitrogen led to a meaningful increase (32%) of disease severity of petals (P<0.01). This was due to decreased Ca concentration in the rose petals. How ever, at Ca, levels of 1.6 to 4.8 mM, a 29-23.2% day-1 deeline in descaae severslty was observed. Also, a significantly negative correlation (P<0.05) was found between petal Ca concentration and the disease severity of GRAY MOLD (r2=0.78). From the results reported herein, it can be concluded that the use of nutrient solution with higher ratio of nitrate to ammonium (100/0) and 4.8 mM Ca could lead to the reduction of disease severity of rose gray ROSE FLOWER.

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APA: Copy

KIANI, SH., ALIZADEH, A., MALAKOUTI, M.J., ZADEH DABAGH, GH., & TABATABAEI, S.J.. (2008). EFFECTS OF PRE-HARVEST APPLICATION OF DIFFERENT NITRATE TO AMMONIUM RATIOS AND CALCIUM LEVELS ON SUSCEPTIBILITY OF CUT ROSE FLOWERS TO GRAY MOLD CAUSED BY BOTRYTIS CINEREA. IRANIAN JOURNAL OF PLANT PATHOLOGY, 44(1 (173)), 73-92. SID. https://sid.ir/paper/48396/en

Vancouver: Copy

KIANI SH., ALIZADEH A., MALAKOUTI M.J., ZADEH DABAGH GH., TABATABAEI S.J.. EFFECTS OF PRE-HARVEST APPLICATION OF DIFFERENT NITRATE TO AMMONIUM RATIOS AND CALCIUM LEVELS ON SUSCEPTIBILITY OF CUT ROSE FLOWERS TO GRAY MOLD CAUSED BY BOTRYTIS CINEREA. IRANIAN JOURNAL OF PLANT PATHOLOGY[Internet]. 2008;44(1 (173)):73-92. Available from: https://sid.ir/paper/48396/en

IEEE: Copy

SH. KIANI, A. ALIZADEH, M.J. MALAKOUTI, GH. ZADEH DABAGH, and S.J. TABATABAEI, “EFFECTS OF PRE-HARVEST APPLICATION OF DIFFERENT NITRATE TO AMMONIUM RATIOS AND CALCIUM LEVELS ON SUSCEPTIBILITY OF CUT ROSE FLOWERS TO GRAY MOLD CAUSED BY BOTRYTIS CINEREA,” IRANIAN JOURNAL OF PLANT PATHOLOGY, vol. 44, no. 1 (173), pp. 73–92, 2008, [Online]. Available: https://sid.ir/paper/48396/en

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