Evaluation of changes in some of produced compounds from drought stress in Citrus natural genotypes

Citrus often are encountered with periodic droughts. For this reason, nucellar seedlings of Poncirus(PT) (Poncirus trifoliata Raf.),Rough Lemon (RL) (Citrus jambhiri Lush.) and 8 Citrus unknown genotypes including of 2-4, 5-2, 12-2, 10-5, 10-1, 2-1, Bakraii and Astaraii lemon were planted in cocopeat and sand medium (1:1) under greenhouse conditions and were subjected to drought stress. This research, was conducted as factorial experiment based on completely randomized design with three replications. The factors were 10 Citrus genotypes and two level of irrigation. The results showed that PT with 298.4 µmol/gdw had maximum accumulation of proline in drought stress. Maximum and minimum accumulation of malondialdehyde (356.9 and 134.4 µmol/gdw, respectively) were observed in RF and PT rootstocks under drought stress. Also maximum of total soluble sugar quantities in 5-2 genotype with 97.37 mg/gdw and minimum in RL with 51.57 mg/gdw were reported under drought stress. RF had minimum of total chlorophyll content under drought stress. The most and  least of total carotenoid content were seen respectively in genotype 5-2 with 9.4 mg/gdw and Astaraii lemon genotype with 4.4 mg/ g dw in drought stress conditions. Maximum of calcium content was observed in PT with 57 mg/gdw and minimum in RF with 32.63 mg/g dw. On the basis of the study, PT and 5-2 genotype were introduced as tolerant and RL and Astaraii lemon as susceptible to drought.