Effect of Treatment with Concentrated Sulfuric Acid and a Homogenizer, and Temperature at Germination and Storage on Seed Germination in Eight Pelargonium Species

Kakihara, Fumika; Hondo, Kana

doi:10.2525/ecb.51.71

Cited by 2 publications

(1 citation statement)

References 17 publications

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“…The experimental results showed that the germination rate of rootstock seeds with the three genotypes exceeded 60%, greater than those of P. alata, P. cincinnata, P. coriacea, P. foetida, P. giberti, P. morifolia, P. mucronata and P. nitida. It was also reported that the germination rate can be further elevated by damaging the seed shell with liquid nitrogen, concentrated sulfuric acid, and other such substances (Kakihara and Hondo, 2013), but further studies should be conducted on the effects of the degree of damage on the germination rates of passion fruit seeds.…”

Section: Discussionmentioning

confidence: 99%

Seed Characteristics of Passion Fruit (Passiflora edulis f. flavicarpa) Rootstocks with Different Genotypes and Responses of Their Seedlings to Drought Stress

Wang,

Chen,

et al. 2024

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Unstable characteristics of rootstocks can easily lead to quality degradation and yield declines for passion fruit. Therefore, this study focused on the seed characteristics, growth, chlorophyll fluorescence parameters under drought stress, and antioxidant enzyme activity of passion fruit rootstocks with three genotypes (R1, R2, and R3). A correlation analysis and a membership function method were adopted for a comprehensive evaluation, expecting to screen out passion fruit rootstocks adaptable to drought-prone areas in China. According to the study results, the three passion fruit rootstocks were evidently different in terms of the seed morphology and germination characteristics. Specifically, the seed width and 1000 seeds weight of R1 were significantly superior to those of R2 and R3, but the germination potential and germination rate of R3 were 87.9% and 93.3%, respectively, significantly higher than those of R1 and R2. Meanwhile, R3 exhibited a greater amount of aboveground biomass and a smaller root-shoot ratio, along with a more efficient water metabolic capacity. The chlorophyll fluorescence parameters, i.e., the initial fluorescence (F0), maximum fluorescence (Fm) and variable fluorescence (Fv), of the rootstock seedlings with three genotypes were not found to be significantly different under drought stress, while the Fv/Fm ratio of R2 was significantly higher than that of R1. The minimum values of H 2 O 2 and superoxide dismutase (SOD) appeared at 3 w after drought stress, and the minimum value of peroxidase (POD) and the peak value of catalase (CAT) were observed at week 4. As evidenced by the comprehensive evaluation, R3 is highly drought-resistant with good breeding potential.

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Section: Discussionmentioning

confidence: 99%

Seed Characteristics of Passion Fruit (Passiflora edulis f. flavicarpa) Rootstocks with Different Genotypes and Responses of Their Seedlings to Drought Stress

Wang,

Chen,

et al. 2024

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Heat and smoke pre‐treatment of seeds to improve restoration of an endangered Mediterranean climate vegetation type

et al. 2016

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Invasive alien plants impact ecosystems, which often necessitates their removal. Where indigenous species recovery fails following removal alone, an active intervention involving reintroduction of seed of native species may be needed. This study investigated the potential for a combination of the fire cues of smoke and heat as a pre-treatment of seeds in breaking dormancy and facilitating increased germination. Species were selected to represent different functional types within Cape Flats Sand Fynbos; a fire-prone, critically endangered vegetation type in South Africa. Seeds were exposed to either a heat pulse (temperatures between 60 and 300°C for durations of between 30 s and 20 min) or dry after-ripening (1 or 2 months at milder temperatures of 45°C or less). Thereafter, seeds were soaked in smoke solution for 18 h and subsequently placed on agar at 10/20°C for germination. Most species fell into one of two main groups: Seed germination in the first group was greatest following a lower temperature (60°C) heat pulse, an extended period of mild temperature (20/40°C or 45°C) exposure, or no pre-treatment with heat. Seed germination in the second group was promoted after brief exposure to higher (100°C) temperatures. No germination occurred in any species following heat treatments of 150°C or higher. Species which responded better to higher temperatures were mainly those possessing physical dormancy, but seed morphology did not correlate with germination success. This study showed that heat stimulation of seeds is more widespread in fynbos plant families than previously known and will enable the development of better seed pre-treatment protocols before large-scale sowing as an active restoration treatment after alien plant clearing.

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Effect of Treatment with Concentrated Sulfuric Acid and a Homogenizer, and Temperature at Germination and Storage on Seed Germination in Eight Pelargonium Species

Cited by 2 publications

References 17 publications

Seed Characteristics of Passion Fruit (Passiflora edulis f. flavicarpa) Rootstocks with Different Genotypes and Responses of Their Seedlings to Drought Stress

Seed Characteristics of Passion Fruit (Passiflora edulis f. flavicarpa) Rootstocks with Different Genotypes and Responses of Their Seedlings to Drought Stress

Heat and smoke pre‐treatment of seeds to improve restoration of an endangered Mediterranean climate vegetation type

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