Study on changes and relationships of physiological and morphological parameters of rye subjected to soil drought stress

* This work was supported by the National Science Centre, Poland, under grant 2015/17/B/ NZ9/01694 K. M. MALINOWSKA et al. 262 LIST OF SYMBOLS USED C – control, well-watered variant of the experiment; ci – intercellular CO2 concentration; D – drought, water deficit variant of the experiment; E – transpiration rate; Fm – maximal fluorescence; Fv – maximal variable fluorescence; Fv/Fm – maximal quantum yield of PSII photochemistry; gs – stomatal conductance; LSDW – lateral stalk spikes dry weight; LSGN – productive lateral spikes grain number; LSGW – productive lateral spikes grain weight; LSN – lateral stalk number; LSTGW – productive lateral spikes thousand grain weight; LSW – productive lateral spikes weight; MSGN – main stem grain number; MSGW – main stem grain weight; MSSL – main stem spike length; MSSW –main stem spike weight; MSTGW–main stem thousand grain weight; MSW – main stem dry weight; PC1 – principal component 1, PC2 – principal component 2; PH – plant height; PI – overall performance index of PSII; PL – peduncle length; PLSN – productive lateral spike number; Pn–net photosynthetic rate; PW – plant dry weight; RWC – relative water content; SN – stalk number; TFM – time required to reach maximal fluorescence; WSD – water saturation deficit; WUE – photosynthetic index of water use efficiency; WUEI – instantaneous photosynthetic index of water use efficiency.