Effects of different pre-treatments and germination media on seed germination and seedling growth of Parkia timoriana (DC.) Merr

Abstract

Parkia timoriana (DC.) Merr. is one of the lesser known multipurpose leguminous tree species found in North East India. Like many other legumes this species too have hard coated seeds which prevent seed germination and thus there is a need to investigate the most appropriate method to break its dormancy. Six pre treatments (tap water, gibberellic acid (GA3) @ 500 ppm, stratification, sulphuric acid @ 98%, boiling water and nicking) and two media (top of paper (TOP) and sand) were use to evaluate seed germination traits and initial growth parameters of the seedling of this tree species. Along with these pre treatments, seeds sown in TOP media and tap water gave maximum seed germination (72%) and it was followed by seeds exposed to GA₃ for 24 hours (64%) while the least seed germination was reported in seeds treated with sulphuric acid (H2SO4) for 5 minutes. Least germination time (Mean Germination Time) was reported from the seeds treated with H2SO4 for 1 minute while maximum was reported from the boiling water treatments. Under sand medium, highest germination was reported in control (66.67 %) and it was followed by boiling water treatment (58.33%) and minimum (16.67%) in seeds treated with H2SO4 for 5 minute. Seed treated with H2SO4 for 5 minutes took minimum germination time too. Interestingly, irrespective to the media, all the seedling growth parameters showed maximum response towards hormonal (GA3) treatment and minimum towards H2SO4 treatment. Significant correlations were found between all the seedling growth parameters except for collar diameter and root-shoot ratio.

Methods for overcoming dormancy and seed storage of <i>Enterolobium contortisiliquum

“…This finding was related to the lack of immersion in water for the seeds in the ES treatment. In contrast, the results showed that immersion in water after scarification increases the moisture content in the seeds and enables the activation of metabolic processes and embryonic development (Tambelini & Perez, 1998;Thangjam & Sahoo, 2017) and that even in freshly collected seeds, the higher the concentration of hydrophobic substances is, the more difficult the germination is. Treatments with mechanical scarification and immersion in water were more efficient for overcoming dormancy compared with the treatments that only used scarification, regardless of storage time ( Figure 3A; Table 2).…”

Effect of Hydrothermal Cooking and Germination Treatment on Functional and Physicochemical Properties of Parkia timoriana Bean Flours: An Underexplored Legume Species of Parkia Genera

“…Prior to germination, the seeds were soaked and manually scarified by secateurs and cutting the seed coat approximately 1 mm from the opposite side of helium [12]. Scarified seeds were rinsed and steeped in distilled water (1:10 w/v) for 24 h, washed, and placed in a damp cotton towel.…”

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“…До головних біологічних функцій гіберелінів належать регуляція процесів проростання насіння, координація поділу клітин і їхнього розтягу, детермінування статі, розвиток пилку і квіток, індукція цвітіння, формування насіння та плодів (Gantait et al, 2015;Kosakivska et al, 2019). Екзогенну обробку гіберелінами успішно використовують для покращення ростових характеристик сіянців різних деревних видів (Ameen, Al-Imam, 2007;Elo et al, 2009;Maku et al 2014;Acar et al, 2017;Thangjam, Sahoo, 2017;Yuan al., 2019;Yücedağ et al, 2019).…”

“…Merr. (Thangjam, Sahoo, 2017), проростання насіння та ріст сходів рослин Mansonia altissima (Maku et al, 2014).…”

“…Максимальні ефекти на ростові показники проростків Parkia timoriana були отримані за обробки ГК 3 у концентрації 500 ррm впродовж 12 та 24 год. Виявлена позитивна кореляція між сирою та сухою біомасою коренів та зменшення діаметру кореневої шийки (Thangjam, Sahoo, 2017). В Eucalyptus grandis W.Hill ex Maiden та Pinus elliottii Engelm.…”