Effects of Drought Stress on Photosynthetic and Physiological Parameters of Tomato

Abstract

<jats:p>Drought has become an important factor limiting crop yields in China. As an important greenhouse horticultural crop in China, the research of tomato (<jats:italic>Solanum lycopersicum</jats:italic> L. cv. Jinpeng No.10) is of great theoretical and practical significance. In the study, four different relative soil moisture contents (74% to 80%, 55% to 61%, 47% to 52%, and 25% to 30%) were used to induce drought stress. We investigated changes in photosynthetic gas exchange, chlorophyll fluorescence, and other related physiological parameters in response to different relative soil moisture contents. Drought inhibited the photosynthesis of tomato significantly, as shown by a clear decline in the net photosynthetic rate. Our results indicated stomatal limitation and nonstomatal limitation were responsible for the photosynthesis reduction.</jats:p>

Drought tolerance inBrassica napusis accompanied with enhanced antioxidative protection, photosynthetic and hormonal regulation at seedling stage

“…In the present study, after 7 days of treatment, leaves of drought‐treated plants were wilted and the shoot biomass decreased along with the leaf gas exchange attributes (Pn, Tr, Gs, and Ci) and RWC, suggesting that drought stress causes cell dehydration and plant growth reduction. These findings correspond to previous studies in different crop plants under water stress (Cai et al, 2020; Liang et al, 2020; Terletskaya et al, 2020). Drought stress treatment significantly tempered the leaf gas exchange parameters (Pn, Gs, and Tr), while considerable reductions in Pn and Gs were observed in the sensitive cultivar (GY605) upon drought stress compared to control (Table 1), which correspond to previous studies on drought stress (Demirel et al, 2020).…”

Drought Tolerant Indices of Lowland Tomato Cultivars

“…Its difference was due to the genetic factors of each cultivar in water usage available in the soil. The ability of plants to use water available in the soil was dominated by genetic variations in each plant (Shamim et al 2014;Pereira et al 2015;Liang et al 2020) Soil moisture levels after watering did not show any significant difference between cultivars both at 7 and 9 WAT. It means that after rewatering, the soil moisture content was similar.…”

“…The relative growth rate felt from 1.37 to 0.57 g weekˉ1 from average to drought conditions (Khan et al 2015). Other researchers pointed out that the maximum fluorescence value and effective PS-II quantum yield of tomato seedling declined by 9.7% and 43.6%, respectively, under drought conditions (Liang et al 2020). Reducing both of the characters dropped the electron transport of PS II and inhibited the photosynthetic carbon metabolism, thus decreasing tomato yield.…”

Leaf gas exchange and growth of Capsicum annuum var. glabriusculum under conditions of flooding and water deficit

“…Under conditions of flooding, different species of Capsicum reduce their photosynthetic pigments content, stomatal conductance (gs), and transpiration rate (E), while increasing their water-use efficiency (WUE) in order to reduce the stress; differences are observed between species in terms of their particular photosynthetic rates and response to the stress (Ou et al 2011(Ou et al , 2017. On the other hand, plants subjected to water deficit reduce their foliar area, which decreases the area available for interception of light, while this stress also induces stomatal closure and decline in mesophyll conductance, affecting photosynthetic rates and biomass accumulation (Anjum et al 2011, Galle et al 2009, Liang et al 2020. Campos et al (2014) indicate that moderate to severe water deficit in chili reduces the assimilation of carbon due to the effect on stomatal conductance, but mainly to the damage produced in the electron transport chain from the pool of plastoquinones to the final acceptors of the PSI.…”