Seed dormancy and germination in Sophora secundiflora (Fabaceae)
DOI:
https://doi.org/10.24193/subbbiol.2024.2.04Keywords:
coat dormancy, germination, mescal-bean, Sophora secundiflora, scarificationAbstract
Given the ecological and horticultural significance of Sophora secundiflora (Ortega) DC., effective dormancy-breaking techniques are crucial for enhancing its cultivation and ensuring successful establishment in both natural and managed environments. Seeds have an extremely hard and water impermeable testa. This study evaluated the effects of mechanical scarification, sulphuric acid soaking for 30, 60 and 90 minutes and hydrogen peroxide soaking for 10 and 20 minutes on final germination percentage (FGP), mean germination time (MGT), time to 50% germination (T50) and coefficient of velocity of germination (CVG). Mechanical scarification and 60-minute sulphuric acid treatments were the most effective, achieving FGPs of 95% and 93%, respectively, and showing efficient germination processes as indicated by T50 and CVG metrics. Mechanical scarification resulted in the fastest and most consistent germination. Sulphuric acid treatments showed time-dependent efficacy, with the 60-minute treatment optimising both germination speed and percentage, whereas the 90-minute treatment caused potential seed damage, reflected in a poorer FGP. Hydrogen peroxide treatments were less effective overall, with a maximum FGP of 33% for the 20-minute soaking. Statistical analyses highlighted significant differences among treatments, particularly for FGP (p < 0.0001), T50 (p = 0.0020) and CVG (p = 0.0348). These findings support the role of physical and chemical scarification in breaking dormancy in Fabaceae seeds, offering valuable insights to optimise germination protocols for S. secundiflora and similar species.
Article history: Received 3 June 2024; Revised 13 November 2024;
Accepted 13 November 2024; Available online 10 December 2024
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