Abiotic stresses due to environmental factors could adversely affect the growth and development of crops. Among abiotic stresses, drought heat stress are two critical threats crop sustainable agriculture worldwide. Considering global climate change, incidence combined is likely increase. The aim this study was shed light on plant performance leaf physiology three tomatoes cultivars ('Arvento', 'LA1994' 'LA2093') under control, drought, stress. Shoot fresh dry weight, area relative water...

The chlorophyll fluorescence parameter F v /F m reflects the maximum quantum efficiency of photosystem II ( PSII ) photochemistry and has been widely used for early stress detection in plants. Previously, we have a three‐tiered approach phenotyping by to identify naturally existing genetic variation tolerance severe heat (3 days at 40°C controlled conditions) wheat Triticum aestivum L.). Here investigated performance previously selected cultivars (high low group based on value) terms growth...

Three genotypes of wheat grown at two CO2 concentrations were used in a drought experiment, where water was withheld from the pots anthesis until stomatal conductance (gs) dropped below 10% control and photosynthesis (A) approached zero. The had different leaf area (Gladius < LM19 LM62) while shoot growth boosted by elevated CO2, use drying rate more determined canopy size than density conductance. responded differently regarding number fertile tillers, seeds per spike 1000 kernel weight...

To evaluate the effect of blue light intensity and timing, two cultivars lettuce [Lactuca sativa cv. ’Batavia’ (green) ‘Lollo Rossa’ (red)] were grown in a greenhouse compartment late winter under natural supplemental high pressure sodium (SON-T) lamps yielding 90 (±10) µmol m-2 s-1 for up to 20 hr, but never between 17:00 21:00. The temperature compartments was 22/11°C day/night, respectively. five light-emitting diode (LED) treatments Control (no addition), 1B 06-08 (Blue at 45 from 06:00...

In view of the global climate change, heat stress is an increasing constraint for productivity wheat (Triticum aestivum L.). Our aim was to identify contrasting cultivars in terms tolerance by mass screening 1274 diverse origin, based on a physiological trait, maximum quantum efficiency PSII (Fv/Fm). A chlorophyll fluorescence protocol standardised and used repeated with increased selection pressure identifying set extreme trait. An initial milder 38°C 300µmolm-2s-1 2h preheating at 33-35°C...

Abstract Tomato cultivars differ in their sensitivity to heat stress, and the depends on developmental stage of plants. It is less known how stress affects tomato at anthesis terms leaf physiology fruit set whether ability tolerate different stages linked. To investigate photosynthetic gas exchange characteristics, carbohydrate content during a thermo‐tolerant cultivar (‘ LA 1994’) thermo‐sensitive (‘Aromata’) were studied seedling stage. The parameters, maximum quantum efficiency...

In nature, crops encounter a combination of abiotic stresses that severely limit yield. Our aim was to dynamically expose the changes tomatoes' physiological parameters drought, heat and their thereby clarify relationship between responses single combined stress. We studied effect drought on shoot root two tomato cultivars (Sufen No.14 as CV1; Jinlingmeiyu CV2). After being exposed stress for 6 days, dry weight significantly decreased. The F q ′/F m ′ (quantum yield photosystem II) lower in...

This study aimed to phenotype young tomato (Solanum lycopersicum L.) plants for heat tolerance by measuring Fv/Fm after short-term treatments in climate chambers and selected sensitive (low Fv/Fm) tolerant (high cultivars investigate their in-field performance. Twenty-eight genotypes were phenotyped at 40:28°C 2 days chambers. A second screening (four high four low genotypes) was conducted 4 38:28°C, followed 5 days' recovery (26:20°C). The maintained net photosynthesis (PN) increased...

Despite the fact that Fv/Fm (maximum quantum efficiency of photosystem II) is most widely used parameter for a rapid non-destructive measure stress detection in plants, there barely thorough study on genetic understanding this trait under heat stress. Our aim was to identify quantitative locus (QTL) and potential candidate genes linked improved photosynthesis wheat (Triticum aestivum L.). Three bi-parental F2 mapping populations were generated by crossing three tolerant male parents (origin:...

The susceptibility of photosynthesis to photoinhibition and its recovery were studied on cultures the cyanobacterium Anacystis nidulans. Oxygen evolution low temperature fluorescence kinetics measured. Upon exposure high light A. nidulans showed a rapid decrease in oxygen followed by quasi steady state rate photosynthesis. This decreased with increasing photon flux density photoinhibitory light. Reactivation dim after treatment was rapid: 85 95% occurred within 2 hours. In presence...

Abstract This study analysed the alleviating effect of elevated CO 2 on stress‐induced decreases in photosynthesis and changes carbohydrate metabolism two wheat cultivars ( Triticum aestivum L.) different origin. The plants were grown ambient (400 μl l −1 ) (800 with a day/night temperature 15/10 °C. At growth stages tillering, booting anthesis, subjected to heat stress 40 °C for three continuous days. Photosynthetic parameters, maximum quantum efficiency photosystem II PSII photochemistry F...

The halophytic crop quinoa (Chenopodium Willd.) is adapted to soil salinity and cold climate, but recent investigations have shown that can be grown in significantly warmer latitudes, i.e. the Mediterranean region, where high temperature occur combination. In this greenhouse study, effects of saltwater irrigation on growth development Bolivian cultivar ‘Achachino’ were determined. Development was slightly delayed response treatment, faster at temperature. Biomass seed yield decreased salt,...

Co-occurrence of cold and drought stress can alter the response plants at morphological, physiological molecular levels, which finally affect crop production, more than individual stress. Understanding responses to combined is necessary improve tolerance maintain production especially in field where frequently occurs. We aimed clarify underlying leaf mechanisms tomato by imposing combining on one popular cultivar 'Jinlingmeiyu' as an example.The genetic were identified tomatoes after 42 h...

Ultraviolet B (UV-B) (280–315 nm) and ultraviolet A (UV-A) (315–400 radiation comprise small portions of the solar but regulate many aspects plant development, physiology metabolism. Until now, how plants respond to UV-B in presence different light qualities is poorly understood. This study aimed assess effects a low dose (0.912 ± 0.074 kJ m –2 day –1 , at 6 h daily UV exposure) combination with four treatments (blue, green, red broadband white 210 μmol s Photosynthetically active [PAR]) on...