Abstract. Tuheteru FD, Husna, Albasri, Arif A, Basrudin, Nurdin WR, Arman E, Agustin DI, Saribadu J, Rahmat, Dermawansyah A, Daliana, Lody LP, Deri AS, Safitri I, Sudrajat DJ. 2022. Effect of pre-sowing treatment on the germination and early growth of Kalappia celebica Kosterm.: an endemic and vulnerable tree species of Sulawesi, Indonesia. Biodiversitas 23: 4297-4302. Kalapi (Kalappia celebica) is an endemic tree species of Sulawesi and is threatened with extinction, so it requires conservation efforts to preserve the tree species. The research aims to determine the effects of seed pre-sowing methods on the germination of K. celebica. Matured seeds of kalapi were collected from several mother trees at the Lalona Village, Kolaka Regency, Southeast Sulawesi, Indonesia. The seeds were treated with six pre-germinations treatments (control, nicking, nicking and soaking in cool water (20°C) for 12 h, nicking and soaking in cool water for 24 h, soaked in hot water (80°C) for 24 h till the water-cooled and soaked in cool water for 48 h. Three replication and each replication using 25 seed were used in this research, so the total seed were 450 seeds. The randomized completely design was used to test the effect of pre-germination treatments on seed germination parameters at the greenhouse. The germination parameters calculated were the first day of germination, last day of germination, germination period, germination capacity, mean germination time (MGT), and mean daily germination (MDG). The results showed that pre-germination treatment affected all seed germination parameters, which significantly increased the germination capacity. The germination capacity with the nicking was 94,67%, nicking and soaking in cool water (20°C) for 12 h (94,67%) followed by nicking and soaking in cool water (20° C) for 24 h (90,67%). In all treatments, germination started 5 to 10 days after sowing and was completed from 4 to 16 days later. The seed treatment by nicking and soaking in cool water for 12 d exhibited the lowest MGT (5.56 days), the highest MDG (0.95 germinate day-1), the highest seedling collar diameter (1.64 mm), and the highest leaf number (1.95). Therefore, the study recommends nicking followed by soaking in cool water for 12 h as an ideal pre-germination treatment to promote germination and seedling growth of kalapi tree species for supported conservation activity.

Abstract. Sudrajat DJ, Rustam E, Widyani N. 2022. Provenance variation in seed storability of jabon (Neolamarckia cadamba) and their response to seed invigoration by priming and gamma irradiation treatments. Biodiversitas 23: 5074-5084. Jabon (Neolamarckia cadamba (Roxb.) Bosser) is a tree species native to Indonesia with a wide growth distribution and high economic potential, but the cultivation of this species is often hampered by low seed viability and vigor, especially for seeds that have undergone storage. This study aims to examine the provenance variation in seed germination and storability of N. cadamba and the effectiveness of invigoration treatments on the stored seed for 5 years. Hydro-priming, osmo-priming, hormone-priming, and gamma irradiation were tested to improve seed germination and seedling growth. The results showed that intra-population variation in seed germination and storability is quite high, ranging from 53.5%-82.8% for germination capacity and rate of germination decline ranging from 0.7%-61.6% after 5 years of storage. Pomalaa provenance had the best seed germination and storability compared to other provenances. The invigoration treatment significantly affected germination and seedling growth of all provenances. Hydro-priming with aquades for 48 hours gave the best germination capacity for Pomalla and Batuhijau provenances. For low initial germination, such as seed from Kapuas, Alas Purwo, and Kampar, the GA3 500 ppm for 48 hours and PEG -1.2 MPa for 24 hours treatments could improve seed viability and vigor. GA3 and gamma irradiation gave the best seedling growth, although other treatments, such as PEG -0.8 MPa for 24 hours, also could increase seedling height and biomass of Kampar provenance. In general, the effectiveness of the invigoration treatment depends on the initial physiological conditions, the invigoration method, and its concentration.