PJB-2023-140
Hero Rahimi
Abstract
Bunium paucifolium and Elewendia cylindrica (Apiaceae) are two wild perennial herbs with medicinal and nutritional value. Both species were included in the Bunium genus before the recent division. The aim of this study was to investigate their seed germination requirements and characterize the class of seed dormancy. The seeds of both species were completely dormant and showed good water absorption. They had small differentiated but underdeveloped embryos located at the stylopodium end. The embryos were spatulate monocotyledonous (100%) with an initial embryo length of 0.33mm in B. paucifolium and linear di (98.3%), tri (1.1%) and tetra cotyledonous (0.6%) with initial length 0.83mm in E. cylindrica. The embryos in both species need cold stratification to reach a critical length required for germination (about 2.2mm for B. paucifolium and 4.3mm for E. cylindrica), indicating they have a kind of complex morphophysiological dormancy. Cold stratification (5oC) resulted in seed germination of 45.2% in B. paucifolium and 39.3% in E. cylindrica. GA3 did not substitute for cold stratification. So these seeds had deep complex MPD. Ungerminated seeds were viable and need dry storage before cold stratification for germination, so they had non-deep complex MPD. The maximum germination percentage was observed for the seeds stored in cold temperature (-22oC) followed by cold stratification (5oC), showing 95.92% for B. paucifolium and 93.46% for E. cylindrica. However, these two species have recently been placed in two separate genus, but they showed the same dormancy break requirements.
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