Comparative Analysis of Primary Photosynthetic Reactions Assessed by OJIP Kinetics in Three Brassica Crops after Drought and Recovery

Plant drought tolerance depends on adaptations of the photosynthetic apparatus to changing environments triggered by water deficit. The seedlings three Brassica crops differing in sensitivity, oleracea L. var. capitata—white cabbage, acephala—kale, and rapa pekinensis—Chinese were exposed withholding water. Detailed insight into machinery was carried out when seedling reached a relative content about 45% after re-watering analyzing OJIP kinetics. key objective this study find reliable parameters for distinguishing drought−tolerant drought-sensitive varieties before permanent structural functional changes occur. According our findings, an increase total performance index (PItotal) structure–function (SFI), positive L K bands, driving forces (ΔDF), resistance (DRI) suggest tolerance. At same time, susceptible can be distinguished based negative PItotal, SFI, density reaction centers (RC/CS0). Kale proved most tolerant, Chinese cabbage moderately susceptible, white showed high sensitivity investigated stress. genetic variation revealed among selected could used breeding programs high-precision crop management.