Drought tolerance in potential oilseed plants for biofuel production

Abstract

Raphanus sativus L. and Crambe abyssinica Hochst. are promising crops for supplying oil to chemical industries. They are not used for human consumption and can be grown off-season due to their short life cycle. However, drought may limit their growth, photosynthesis and productivity. Thus, the aim of this research was to evaluate the morphological and physiological responses of R. sativus and C. abyssinica subjected to water deficit to identify the strategies used by these species to tolerate the effects of water stress. Two independent experiments for R. sativus and C. abyssinica were conducted with different water replacements: 100% (control), 66% and 33% of the field capacity. The characteristics of water relations, gas exchange, chlorophyll fluorescence, chloroplastidic pigments, morphology and root distribution in the soil profile were evaluated separately in both crops. The results indicate the ability of both species to control water loss. In R. sativus and C. abyssinica, the cell turgor and consequently photosynthesis and growth were maintained even under drought conditions. The maintenance of water status was achieved by osmotic adjustment in R. sativus, and also the root distribution and deepening in both species. Such responses allowed R. sativus and C. abyssinica to be classified as tolerant to drought conditions.

Hydrogen sulfide, potassium phosphite and zinc sulfate as alleviators of drought stress in sunflower plants

“…There was no alleviation of the WD condition in reducing the biometric characteristics of plants with the spraying of NaHS, KPhi, and ZS. The decrease in growth primarily occurred due to the restriction of CO 2 assimilation and reduction in the accumulation of biomass, which was reported in other plants with high oil production potential (Moura et al, 2018). [SDM, (f)] of sunflower plants after 10 days in substrate humidity (SH) conditions of 100% (well-watered, WW) and 30% (water deficit, WD) of the field capacity (FC) combined with the spraying of alleviators: potassium phosphite (KPhi), zinc sulfate (ZS), hydrogen sulfide (HS) donor NaHS, and without product (WP).…”

Physiological tolerance to drought under high temperature in soybean cultivars

“…It is adversely affecting plant development in many agricultural areas (Dai et al, 2018). Water deficit promotes the reduction of leaf water potential, leading to stomatal closure, decreased CO 2 absorption, and reduced photosynthesis (Goisser et al, 2016;Batista et al, 2018;Moura et al, 2018). In addition, water deficit increases foliar temperature (Heschel et al, 2014), affects membrane properties, and decreases dry matter production, leading to premature senescence and causing reduced production (Arruda et al, 2015;Fernandes et al, 2015).…”

Sensitivity of forage turnip to the herbicide tepraloxydim

“…Ceres, Viçosa, v. 67, n.1, p. 052-061, jan/feb, 2020 remained around 0.8, show that there was no photoinhibition (Maxwell & Johnson, 2000). Similar values for this parameter of F V /F M were visualized by Silva et al (2014) and Moura et al (2018) in R. sativus plants, when compared to the control plants, proving that these were ideal values for this species. The increase of F 0 as a function of the increase of the doses of the herbicide tepraloxydim, even in a non-high order, is an indication of the limitations in the transfer of the excitation energy from the antenna pigments to the reaction center (Lima et al, 2017;Batista et al, 2018).…”