Presentation Title

A study of germination attributes in Eriastrum densifolium ssp. sanctorum seed biology

Faculty Mentor

Darren Sandquist

Start Date

23-11-2019 10:00 AM

End Date

23-11-2019 10:45 AM

Location

53

Session

poster 3

Type of Presentation

Poster

Subject Area

biological_agricultural_sciences

Abstract

The federally endangered California native plant species Eriastrum densifolium ssp. sanctorum (Eds) is a flood-dependent species, with increased establishment following soil disturbance and large inputs of water. Construction of Seven Oaks Dam (Highland, CA) may preclude natural flooding and Eds recruitment. A comprehensive understanding of Eds germination processes will benefit future mitigation and management of this species. This study is a synthesis of multiple projects performed to gain insight into the requirements and factors of Eds germination. Flood disturbance factors were examined to determine which factors specifically aided in germination. Germination counts were observed to have the highest values under a light rain condition for 48 hours and having the second highest counts in a heavy rain condition where flowerheads received water input for 10 days. For future mitigation and management, seed collection methods were tested as well as variability in seed viability among sites. There was variation of germination among sites precluding the use of a single seed-to-bulk mass regression for predicting viability. Storage conditions may also affect seed viability. Four storage temperatures, with and without desiccant, were tested to determine optimal storage conditions. Eds seeds were found to have the highest germination percentages, across 21 years of storage, when stored in -35C conditions regardless of desiccant presence, however all storage temperatures fared well (> 50 % germination) even after 21 years.

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Nov 23rd, 10:00 AM Nov 23rd, 10:45 AM

A study of germination attributes in Eriastrum densifolium ssp. sanctorum seed biology

53

The federally endangered California native plant species Eriastrum densifolium ssp. sanctorum (Eds) is a flood-dependent species, with increased establishment following soil disturbance and large inputs of water. Construction of Seven Oaks Dam (Highland, CA) may preclude natural flooding and Eds recruitment. A comprehensive understanding of Eds germination processes will benefit future mitigation and management of this species. This study is a synthesis of multiple projects performed to gain insight into the requirements and factors of Eds germination. Flood disturbance factors were examined to determine which factors specifically aided in germination. Germination counts were observed to have the highest values under a light rain condition for 48 hours and having the second highest counts in a heavy rain condition where flowerheads received water input for 10 days. For future mitigation and management, seed collection methods were tested as well as variability in seed viability among sites. There was variation of germination among sites precluding the use of a single seed-to-bulk mass regression for predicting viability. Storage conditions may also affect seed viability. Four storage temperatures, with and without desiccant, were tested to determine optimal storage conditions. Eds seeds were found to have the highest germination percentages, across 21 years of storage, when stored in -35C conditions regardless of desiccant presence, however all storage temperatures fared well (> 50 % germination) even after 21 years.