Maybe because biological agents try to be overlooked, or because they try to complete their cycles with sufficient time to not completely kill the host.
i agree with Mr. domingo, biological agent sometimes just damaging one or more area in plants body ( eg. leaves only, or fruit only, etc)
abiotic stresses induce more destructive factors such as ROS that could cause cell death,
i think abiotic stresses had more complex and paralel effect to plant metabolism that usually causing cell death (necrosis)
Abiotic stresses have immediate effect on cells i.e. In roots, shoots & leaves leading to oxidative stress
formation of ROS during the abiotc stress is major cause of the cell death ... as these are destructive to the cell membrane, DNA and the cellular compartments..
the biotic stress also dangerous but to a particular cell type as in case of various viral and bacterial infection since they are targeted to particular cell type and particular organ , for example as we know that the HIV are cell specific to T-Helper sells with CD4 receptors. so they are going to harm a particular cell type but not the whole organism . as compare to abiotic stress it is not specific to particular cell type...
Yes I agree with Prakash. Plant defense mechanism is more active for biotic stresses then abiotic stresses. Since abiotic stresses impact on whole plant organs and processes like physiological, biochemical, metabolomic etc so CDP is triggered by high ROS for basal level of tolerance.
Yes I agree with Hirani & Prakash. Plant defense mechanism is more active for biotic stresses then abiotic stresses.
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