Results
At the end of the experiment, we successfully treated 1320 flowers (660
flower pairs). Zero counts made up 24% of the total data, and seed
number ranged from 1 to 1282 seeds per flower (depending on species),
with a median of 4 seeds per flower.
The effect of pollen type, recipient and donor status on
seed set and seed
number
Heterospecific pollen did not reduce seed set, and neither seed number
(see Figure S 2-3, Table S 3-4. Overall, rare species tended to have
higher seed number compared to common species, but this trend was not
significant. Similarly, recipient status and donor status did not affect
seed set nor seed number (see Figure S 4-5, Table S 5-6).
The effect of recipient and donor self-compatibility on
seed set and seed
number
Self-incompatible recipient species showed a lower seed set probability
compared to self-compatible species (SI/SC odds ratio = 0.0206, SE =
0.0416, p-Value = 0.05). This effect was independent of pollen type
treatment (see Figure 2 and Table 1-2). Seed number was not affected by
self-compatibility of recipient and donor species). (see Figure S 6-8;
Table S 7-8).
The effect of recipient-donor relatedness on seed
number
Overall, phylogenetic relatedness between recipient and donor species
did not affect the strength of HPI. For rare recipients with rare
donors, HPI tended to decrease with relatedness
(Δlrr/ΔPD= –0.0017, SE = 0.0010,
p-Value = 0.08), with more distantly related recipient-donor species
pairs less affected by HP. (see Figure 3 and Table 3-4).