Echinocereus cinerascens

Name and provenance of the material

POWO accepts Echinocereus cinerascens (DC.) Haage and lists Cereus cinerascens DC. as a synonym. The 2026 paper uses the authorship (DC.) Lem. in its title. The findings concern plants identified by the researchers as this species. Seeds came from mature fruits collected in August 2021 on the Altiplano Potosino at 1840 m elevation. They were stored at 4°C for 11 months before the experiment. [Quiroz-González et al. 2026] [2-WWW]

Temperature and water potential

The researchers compared temperatures of 10, 18, 25 and 30°C and four water potential levels. The control consisted of a well hydrated substrate with a potential close to 0 MPa. Other treatments used −0.5, −1.0 and −1.5 MPa. Each of the 16 treatment combinations included five replicates of 20 seeds. The experiment lasted 30 days under 12 hours of light and 12 hours of darkness per day. [Quiroz-González et al. 2026]

Seeds germinated on filter paper. Water availability was modified using polyethylene glycol PEG 8000, and experimental units were weighed and lost water replaced. Increasingly negative potential represented conditions that restricted water uptake by the seed. This laboratory arrangement allows comparison of responses to water deficit, while differing from a mineral substrate and water movement in a pot. [Quiroz-González et al. 2026]

Conditions supporting high germination

Under well hydrated conditions at 18 or 25°C, germination exceeded 95%. Lowering water potential reduced germination and prolonged its course. No germination was recorded at 10°C during the study period. At 30°C, combination with water deficit from −0.5 to −1.5 MPa also inhibited this developmental stage. The result identifies favourable conditions for the tested material among the treatments compared. [Quiroz-González et al. 2026]

Under less favourable conditions, the timing and magnitude of the response varied more between replicates. The authors discuss spreading germination over time as a possible way of reducing the risk of losing an entire cohort in a variable environment. This adaptive interpretation requires studies of seedling survival and reproductive consequences in the field. The experiment itself documents seed responses during germination. [Quiroz-González et al. 2026]

Significance for propagation

The paper supports germination trials with this material under good hydration at 18–25°C, with temperature monitored at seed level. Its findings concern filter paper and a particular stored seed lot. Selection of a growing substrate, ventilation and subsequent seedling care requires separate assessment. A temperature at which germination stops describes a developmental process over the duration of the experiment. Seed survival and the tolerance of mature plants require other tests. [Quiroz-González et al. 2026]

Germination was scored when the embryo visibly emerged through the seed coat. A high percentage therefore indicates successful completion of this stage in the particular seed lot. Subsequent root and shoot growth and seedling survival following changes in conditions are later stages of propagation that require separate monitoring. [Quiroz-González et al. 2026]

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