To investigate the effects of water withholding on 17 tomato (Solanum lycopersicum L.) landraces collected from different climatic zones of Iran and two commercial hybrids, the polyphasic OJIP fluorescence transient, relative water content (RWC), electrolyte leakage (EL) and vegetative growth parameters were analyzed. Duncan’s multiple range test (DMRT) for all the studied parameters and drought factor index (DFI) based on performance index on the absorption basis (PI_abs) were used for screening the plants based on their tolerance to drought condition. Result showed that compared to the control plants, vegetative growth parameters, RWC, PI_abs, relative maximal variable fluorescence (F_M/F₀), maximum quantum efficiency of PSII (F_V/F_M), quantum yield of electron transport (ΦE₀) and electron transport flux per reaction center (RC) (ET₀/RC) were decreased, whereas, EL, quantum yield of energy dissipation (ΦD₀), specific energy fluxes per RC for energy absorption (ABS/RC) and dissipated energy flux (DI₀/RC), which are closely related to the incidence of photoinhibition were increased in plants exposed to water withholding. DMRT and DFI screening results clearly categorized the landraces into three groups (tolerant, moderately sensitive and sensitive). Tolerant landraces showed less change for most of the measured parameters compared to sensitive and moderately sensitive landraces. We found that adapted landraces to dry climates had a higher tolerance to drought stress. Principal component analysis (PCA) revealed that F_M/F₀, F_V/F_M, ΦE₀, ΦD₀, PI_abs, ABS/RC, ET₀/RC and DI₀/RC parameters are the most sensitive parameters for detection of impact of drought stress on tomato plants. In conclusion, the eight parameters have the potential to identify the drought injury in tomato seedlings.

为了调查水分抑制对从伊朗不同气候区和两个商业杂交种采集的17个番茄（Solanum lycopersicum L.）地方品种的影响，多相OJIP荧光瞬态，相对含水量（RWC），电解质渗漏（EL）和营养生长分析参数。使用邓肯的所有研究参数的多范围试验（DMRT）和基于吸收基础上的性能指标（PI _abs）的干旱因子指数（DFI）来根据植物对干旱条件的耐受性进行筛选。结果表明，与对照植物相比，营养生长参数RWC，PI _abs，相对最大可变荧光（F _M / F ₀），PSII（F的最大量子效率_V / F_中号），电子传递量子产率（φE ₀）和每反应中心（RC）（ET电子传输通量₀ / RC）的降低，而，EL，量子产率能量耗散（ΦD ₀），每RC特定能量通量用于能量吸收（ABS / RC）和消耗的能量通量（DI ₀/ RC），这与光抑制的发生率密切相关，但在暴露于水分的植物中却增加了。DMRT和DFI筛选结果清楚地将地方品种分为三类（宽容，中度敏感和敏感）。与敏感和中度敏感的地方品种相比，宽容的地方品种在大多数测量参数中的变化较小。我们发现适应干旱气候的地方品种对干旱胁迫具有较高的耐受性。主成分分析（PCA）透露那个F_中号/ F ₀，F _V / F_中号，φE ₀，ΦD ₀，PI _ABS，ABS / RC，ET ₀ / RC和DI ₀/ RC参数是检测干旱胁迫对番茄植株影响的最敏感参数。总之，这八个参数具有识别番茄幼苗干旱伤害的潜力。