Different drought resistance mechanisms between two buckwheat speciesFagopyrum esculentumandFagopyrum tataricum

Abstract

Water availability is one of the main factors affecting crop production and the occurrence of drought periods is expected to increase in the context of ongoing climate change. We investigated the impact of water stress on two pseudocereal species, common buckwheat (Fagopyrum esculentum) and Tartary buckwheat (Fagopyrum tataricum). Plants were grown under greenhouse conditions under two water regimes: control (40-50% soil humidity) and water stress (<20% soil humidity). Although closely related, both species differed by their resistance to water stress. The vegetative growth was affected in F. esculentum but not in F. tataricum as water stress decreased leaf production, leaf fresh, and dry weight, stomatal conductance, transpiration rate, and photosynthesis rate in the former but not in the latter. However, chlorophyll fluorescence parameters were not affected by water stress, whatever the species, and the chlorophyll content increased in water-stressed plants in both species.Oxidative stress was observed in both species in response to water stress, and antioxidant content was increased in F. tataricum. The reproductive phase was affected by water stress in both species: the number of inflorescences and pollen production decreased, mainly in F. esculentum. Seed set was maintained in F. tataricum while this parameter was not investigated in F. esculentum due to its self-incompatibility. Our results suggested that F. tataricum was more resistant to water stress than F. esculentum and that F. esculentum had characteristics of drought avoidance, while F. tataricum exhibited traits of drought tolerance. | INTRODUCTIONIn the face of climate change, extreme events, such as drought are expecting to become more frequent and more intense (IPCC, 2014). It will have many negative impacts on crop production. Indeed, water availability is one of the main factors impacting crop production (Barnabás et al., 2008;Gray and Brady, 2016). When the water supply is inferior to the water demand, plants encounter water stress (Salehi-Lisar and Bakhshayeshan-Agdam, 2016). Water stress can have many impacts on plants at every life stage. It can decrease the germination rate (

Growing and Flowering in a Changing Climate: Effects of Higher Temperatures and Drought Stress on the Bee-Pollinated Species Impatiens glandulifera Royle

“…I. glandulifera plants were relatively tolerant to higher temperatures during their vegetative phase, as only physiological parameters such as SLA and stomatal conductance were lower at 27 • C. As higher temperatures did not affect leaf water content, reduced SLA is most likely attributable to a reduction in leaf size, which has been reported under similar conditions in other plant species [52]. In agreement, cell elongation becomes impaired when temperatures exceed the optimum for plant growth [53].…”

“…Stomatal responses vary greatly between plant species [ 51 ]. For example, drought did not affect stomatal conductance in other species such as Tartary buckwheat ( Fagopyrum tataricum ) and starflower ( Borago officinalis ) [ 12 , 52 ]. Leaf water content remained constant between well-watered and drought-stressed plants and specific leaf area was neither affected by water stress.…”

Comparison of Heat and Drought Stress Responses among Twelve Tartary Buckwheat (Fagopyrum tataricum) Varieties

“…Although F. tataricum was reported to be widely adaptable to hostile environments [ 43 ], its physiology and response to abiotic stress remain largely unknown. In previous studies, we compared the response of F. esculentum and F. tataricum to high temperature [ 44 ] and water stress [ 45 ]. High temperature mainly affected the reproductive stage and increased the antioxidant concentration in the two buckwheat species [ 44 ].…”

“…High temperature mainly affected the reproductive stage and increased the antioxidant concentration in the two buckwheat species [ 44 ]. However, both species differed in their strategy to cope with water stress [ 45 ]. Vegetative and reproductive growth was less affected in F. tataricum than in F. esculentum , and it was suggested that F. tataricum exhibited traits of drought tolerance [ 45 ].…”

Pretreatment with H2O2 Alleviates the Negative Impacts of NaCl Stress on Seed Germination of Tartary Buckwheat (Fagopyrum tataricum)

“…F. tataricum frequently grows in poor quality soil including soils with increased salinity and H 2 O 2 can alleviate the negative impacts of salt stress on seed germination. At present, there are few studies that investigate the effect of H 2 O 2 seed soaking on the germination characteristics of F. tataricum seeds under salt stress [ 16 , 17 ]. We soaked F. tataricum seeds in different concentrations of H 2 O 2 to examine the germination characteristics, seedling growth, antioxidant enzyme activity, membrane lipid peroxidation, and osmotic adjustment substances present in seeds under salt stress.…”