The Effects of Cross & Self-Fertilisation in the Vegetable KingdomDarwin, Charles
Science
The Effects of Cross & Self-Fertilisation in the Vegetable Kingdom
Darwin, Charles
Fertilization of plants; Plants -- Variation; Pollination
Some long-styled and short-styled plants were now raised from purchased
seeds, and flowers on both forms were legitimately crossed with pollen
from a distinct plant; and other flowers on both forms were
illegitimately fertilised with pollen from the flowers on the same
plant. The seeds were sown on opposite sides of Pots 1 to 4 in Table
6/95; a single plant being left on each side. Several flowers on the
illegitimate long-styled and short-styled plants described in the last
paragraph, were also legitimately and illegitimately fertilised in the
manner just described, and their seeds were sown in Pots 5 to 8 in the
same table. As the two sets of seedlings did not differ in any essential
manner, their measurements are given in a single table. I should add
that the legitimate unions in both cases yielded, as might have been
expected, many more seeds than the illegitimate unions. The seedlings
whilst half-grown presented no difference in height on the two sides of
the several pots. When fully grown they were measured to the tips of
their longest leaves, and the result is given in Table 6/95.
TABLE 6/95. Primula sinensis.
Heights of plants measured in inches.
Column 1: Number (Name) of Pot.
Column 2: Plants from legitimately Crossed seeds.
Column 3: Plants from illegitimately Self-fertilised seeds.
Pot 1 : 8 2/8 : 8.
From short-styled mother.
Pot 2 : 7 4/8 : 8 5/8.
From short-styled mother.
Pot 3 : 9 5/8 : 9 3/8.
From long-styled mother.
Pot 4 : 8 4/8 : 8 2/8.
From long-styled mother.
Pot 5 : 9 3/8 : 9.
From illegitimate short-styled mother.
Pot 6 : 9 7/8 : 9 4/8.
From illegitimate short-styled mother.
Pot 7 : 8 4/8 : 9 4/8.
From illegitimate long-styled mother.
Pot 8 : 10 4/8 : 10.
From illegitimate long-styled mother.
Total : 72.13 : 72.25.
In six out of the eight pots the legitimately crossed plants exceeded in
height by a trifle the illegitimately self-fertilised plants; but the
latter exceeded the former in two of the pots in a more strongly marked
manner. The average height of the eight legitimately crossed plants is
9.01, and that of the eight illegitimately self-fertilised 9.03 inches,
or as 100 to 100.2. The plants on the opposite sides produced, as far as
could be judged by the eye, an equal number of flowers. I did not count
the capsules or the seeds produced by them; but undoubtedly, judging
from many previous observations, the plants derived from the
legitimately crossed seeds would have been considerably more fertile
than those from the illegitimately self-fertilised seeds. The crossed
plants, as in the previous case, flowered before the self-fertilised
plants in all the pots except in Pot 2, in which the two sides flowered
simultaneously; and this early flowering may, perhaps, be considered as
an advantage.
27. POLYGONEAE.--Fagopyrum esculentum.
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