Dear David Becerril-Gonzalez Seed size has important effect on germination time. Under natural condition, small seeded species germinates faster than large seeded species. For example, under given field condition, chickpea and faba bean normally takes 6-8 days to germinate compared to fenugreek or lentils which take only 4-5 days for germination. Water requirement for germination of large seed is more than that of small seed. Of course, there may be genotypic difference for germination time within the species; however, within the species ass well, the difference is related to size of seeds.

Thanks!

It's impossible to know the 'reason' for the effect, unless you are God, since it's a teleological question. However, you can speculate on the effect of the association, but you could also say that the result is unreliable since the variance is higher for large seeds. But you can propose an 'advantage', since large seeds are known to have increased germination, seedling growth and survival :)

in a plant species, bigger seeds generally derminate faster

Dear David Becerril-Gonzalez

here are some article disscuss this topic

https://www.nature.com/articles/hdy199029

Article Reproductive and germination ecology of Sinai primrose, Prim...

Article Effect of Seed Size on Germination, Emergence, Growth and Se...

Dear David thanks for this nice topic about seed germination.

Many factors affect seeds germination (environmental, physiological, anatomical, molecular, morphological, evolutional factors etc…). In addition to the above mentioned factors, the conditions in which the experiment is implemented also strongly affect the seeds germination. So, all these factors should be emphazing whenever we are assessing the seeds responses of any plant species. We could expect the bigger seeds to have short time responding than the small as the bigger seeds have enough reserves in addition to their greater water content compared to the small. However, any small seeds can germinate faster than the bigger if the latter does not have any dormancy. Reversely, the bigger seeds can also respond early than the small if the bigger ones are not facing any dormancy. So, be sure about all the factors associated to your experiment. The seeds responding can also vary within the seeds which similar size. For example, Prosopis genus might have similar seeds especially from the seed size but the responding of the native one is in general delayed compared to the invasive one. Maybe light affected your seeds responses, some seeds are well adapted to have stronger responses in the light than the dark and some other could only show greater responses in the dark and vice versa. In general, the small seeds have higher adaptability in the light than in the dark and therefore, could respond faster than the bigger seeds. In this case, seed size could not be emphazed to justify your results.

Some environmental stressors in respect to the salt have shaped the responses behaviour of the seeds of some plants species. Certain plants species are adapted to both saline and non-saline habitats and therefore, higher variability of responses regarding those seeds can be observed while experimenting.

Certainly size of seeds it's very important to germination

Dear David Becerril-Gonzalez Seed size has important effect on germination time. Under natural condition, small seeded species germinates faster than large seeded species. For example, under given field condition, chickpea and faba bean normally takes 6-8 days to germinate compared to fenugreek or lentils which take only 4-5 days for germination. Water requirement for germination of large seed is more than that of small seed. Of course, there may be genotypic difference for germination time within the species; however, within the species ass well, the difference is related to size of seeds.

Thanks!

Dear David,

It is relative, usually in cereals and purses the size of seeds reflects the quality of whether good or bad depending on varieties or species. if the big size is selected from the pool of one specific variety, then your explanation could hold attention. If the big size is selected from different species, then more other factors are to be looked at, eg. genotype, phenotype, environment holistically. otherwise, we see also in some species, the small-sized seeds germinating faster than the big ones..

Completely according to Andrew and Tsombou, germination depends on several factors. I recommend this article.

Definitely cannot be generalized

https://academic.oup.com/aob/article/107/6/939/223405?login=true

There are tiny seeds which germinate very fast. Grass e.g.

Germination is influenced by various factors; seed size, nature of the coat, internal situtation (to mean exogenous & endogenous dormancy), the type and nature of soil and preparation; these all factors contribute germination time and in general, seeds with bigger size germinate faster. Following article can give you information on the relation: The effect of seed size on germination and seedling growth of Cryptocarya alba (Lauraceae) in Chile.