بررسي اثر تيمارهاي مختلف تنش غرقابي بر برخي از پارامترهاي مورفولوژيكي فلفل (Capsicum annuum L )

The effect of different treatments of flooding stress on some of the morphological parameters in peper (Capsicum annuum L.) plant

Water logging has a major impact on both natural vegetation and agricultural crops. Soil water logging occurs when over irrigation and excessive rainfall combine with poor drainage. The most detrimental effect of water logging is oxygen deficiency in the soil, because roots are particularly sensitive to anaerobic conditions, which can severely affect nutrient relations of the soil. Leaf epinasty, lateral root production, internodes elongation, were observed in flooded plants, which probably is the result of increasing ethylene production by plants. One of the morphological and anatomical mechanisms for acclimation of plants to flooding stress probably will be the avoidance of water loss by transpiration. The other will be a facilitation in transport of atmospheric O2 to the submerged roots by formation of adventitious roots and aerenshyma. However, comparison of microscopic section showed that in stem of treated with 5 and 7 days flooding, aerenshyma formed.