THE GROWING WORLD OF DAHLIAS |
The outer petals of all the first flowers were graded into seven colour
groupings � white,
yellow, pink, orange, red (recorded as deep red and red) and a final group
comprising lilac, lavender and purple. The reasons for formulating this last
group were firstly, that the numbers of any one of these colours was low and
secondly that assessing the differences between them at the time of recording,
in very varied light and weather conditions and subsequently using the photos,
proved to be very imprecise.
The colours of the selected seed parents were limited � mostly to reds, which
however varied considerably within that parameter. So a distinction was made
between those which were deep red and those of a lighter red.
The same range of colours was recorded for the collar petals � however, there
were none with deep red collars.
Two other totals were recorded for each seed parent � the number of first
flowers having no collar petals (and those with only rudimentary collar petals)
and the number of flowers that had the same colour main petals and collar
petals.
For both the main petals and the collar petals, the number of flowers having two
distinct colours was recorded. In each case the predominant colour was recorded
in the data.
S | U | C | A | P | J | M | H | |
Total plants | 71 | 98 | 103 | 110 | 26 | 70 | 50 | 91 |
MAIN PETALS | ||||||||
White |
14
(19.7%) |
4
(4.1%) |
9
(8.7%) |
29
(26.4%) |
3
(11.5%) |
4
(5.7%) |
2
(4%) |
20
(22.0%) |
Yellow | 2
(2.8%) |
10
(10.2%) |
3
(2.9%) |
8
(7.3%) |
6
(23%) |
5
(7.1%) |
3
(6%) |
22
(24.2%) |
Pink | 9
(12.7%) |
12
(12.2%) |
18
(17.5%) |
18
(16.4%) |
3
(11.5%) |
15
(21.4%) |
4
(8%) |
3
(3.3%) |
Orange | 6
(8.5%) |
8
(8.2%) |
15
(14.6%) |
1
(0.9%) |
3
(11.5%) |
3
(4.3%) |
4
(8%) |
3
(3.3%) |
Red |
31
(43.7%) |
30
(30.6%) |
25
(24.3%) |
13
(11.8%) |
9
(34.5%) |
31
(44.2%) |
18
(36%) |
19
(20.9%) |
Deep red |
3
(4.2%) |
13
(13.3%) |
16
(15.5%) |
5
(4.5%) |
2
(7.5%) |
3
(4.3%) |
16
(32%) |
14
(15.4%) |
Lilac, mauve etc. |
6
(8.5%) |
21 (21.4%) |
17
(16.5%) |
36
(32.7%) |
0
(0%) |
9
(12.9%) |
4
(8%) |
10
(11.0%) |
2 colours |
3
(4.2%) |
7 (7.1%) |
6
(5.8%) |
6
(5.5%) |
0
(0%) |
20 (28.2%) |
6
(12%) |
4
(4.4%) |
COLLAR PETALS | ||||||||
White |
28
(39.4%) |
14
(14.3%) |
21
(20.4%) |
41
(37.2%) |
4
(15.4%) |
21
(30.0%) |
10
(20%) |
40
(44%) |
Yellow |
6
(8.5%) |
21
(21.4%) |
15
(14.6%) |
8
(7.3%) |
2
(7.7%) |
9
(12.9%) |
7
(14%) |
44
(42.1%) |
Pink
|
12
(16.9%) |
23
(23.5%) |
24
(23.3%) |
18
(16.4%) |
3
(11.5%) |
32
(45.7%) |
8
(16%) |
4
(4.4%) |
Orange |
3
(4.2%) |
5
(5.1%) |
13
(12.6%) |
0
(0%) |
1
(3.8%) |
1
(1.4%) |
1
(2%) |
0
(0.0%) |
Red |
14
(20.0%) |
9
(9.2%) |
8
(7.8%) |
6
(5.5%) |
4
(15.4%) |
4
(5.7%) |
9
(18%) |
1
(1.1%) |
Lilac etc. |
5
(7.0%) |
15
(15.3%) |
10
(9.7%) |
24
(21.8%) |
0
(0%) |
3
(4.3%) |
4
(8%) |
1
(1.1%) |
No collar |
3
(4.2%) |
11
(11.2%) |
12
(11.7%) |
18
(16.4%) |
12
(46.2%) |
0
(0.0%) |
11
(22%) |
6
(6.6%) |
Outer/collar same |
32
(45%) |
35
(35.7%) |
44
(42.7%) |
70
(63.6%) |
9
(34.6%) |
19
(27.1%) |
8
(16%) |
41
(45.1%) |
2 tone |
11
(15.5%) |
20
(20.4%) |
19
(18.4%) |
1
(.0.9%) |
3
(11.5%) |
2
(2.8%) |
14
(28%) |
12
(13.2%) |
These figures are represented graphically on the next page.
Analysis of the graphs.
ANALYSIS
1). SUE MOUNTJOY
The graphs for SUE MOUNTJOY (C) AND SUE MOUNTJOY (U) are very similar. Each of
the other graphs shows much greater variations. This indicates that if these
seed parents experienced pollination from different sources that it had minimal
effect. If this is true then brush pollination and bagging would have no
advantages over allowing natural pollination.
Approximately 40% of the SUE MOUNTJOY seedlings had red outer petals -the most
common collar petal colour was pink, so the parental colours were paramount. The
collar colours were more evenly distributed than in any of the other seed
parents.
The incidence of flowers without collar petals for SUE MOUNTJOY was low (4 and
11%). At approximately 40% (45% and 35%) the incidence of flowers having the
same colour outer and collar petals was high.
2). DEMI SCHNEIDER
Nearly one half of the seedlings had red outer petals while 20% were white. 40%
of their collars were white and 20% red. Over 40% of the flowers had the same
colour outer and collar petals. So again the offspring tended to mirror the seed
parent�s colours.
This seed parent yielded the lowest incidence of yellow outer and collar petals
and the highest occurrence of red collar petals in the study.
Only three of the 71 first flowers had no collar petals.
3). TEESBROOKE AUDREY
The colour of this seed parent was distinctively different to the others in the
study and one of the two non IJK varieties. The parental lilac and white was
very evident in the seedlings. 32% had outer petals that were lilac while 26%
were white. The figures were essentially reversed in the case of the collar
petals with 37% white and 22% lilac. Compared to the other seed parents very few
of the (A) flowers were red or yellow � orange was absent.
Seventy of the one hundred and ten TA seedlings grown had flowers having the
same colour outer and collar petals -�very much the highest in the study. One
sixth of the flowers produced had no collar petals.
While the great majority of flowers from this seed parent were white or pastel
colours there were several that were strongly coloured � four were selected for
trial in 2005. Also there was one with a red disc.
4). PATRICIA
Patricia is the other seed parent to come from a non IJK source. It had the
poorest record in the study for producing seedlings with no collar petals �
nearly one in two.
Again the most common outer petal colour was the same as the seed parent � red,
but in this case the incidence of red collar petals was also high. Nine of the
fourteen flowers that had collar petals were the same colour as the main petals
(64%).
The eccentrics in this group were a red waterlily and (another) flower with a
red disc.
5). EDITH JONES
This seed parent is pink with a red blush increasing towards the centre and a
pink collar.. The red component is very apparent in the seedlings outer petals �
44% but only 6% of the collar petals. The pink component occurs in 22% of the
outer petals and 46% of the collar petals. So nearly 70% of the flowers had pink
or red outer petals and over one half of the collar petals were red or pink. So
here is a clear case of the seedlings mirroring the colours of the seed parent.
Every one of the seedlings from Edith Jones had collar petals of at least
one-third the length of the main petals � so a nought in the �No Collar� column.
Just over a third of the flowers had collar and outer petals of the same colour.
Twenty of the seedling�s outer petals were two-toned (28.6%)
6). DEE MORRELL
This variety has very deep red outer petals and pink collar petals. The deep red
component in the seedlings was by far the highest in this study at 32%. Those
categorised as red totalled 36% - so the appropriate column shows that 68% of
the seedlings had red main petals. The collar petal colours were fairly evenly
split between white, yellow, pink and red. So in this case only the outer petal
colour of the seed parent was very prominent in the seedlings.
Over a fifth of the seedlings were rated as having no collar petals. Only 16%
had collar petals of the same colour as their outer petals � the lowest amount
in the study. This is not surprising in view of the fairly even split of collar
colours as referred to above. Another aspect of similarity to the seed parent is
that all the seedlings were low growing with quite weak growth and much weaker
stems than seedlings from the other seed parents.
7). JACQUIE HURST
The main petal colour of this variety is a good strong red, while the collar
petals are vibrant yellow. Again these colours predominate in the seedlings of
which 36% had red main petals (fairly evenly split between deep red and red).
86% of the collar petals were either yellow or white (almost equal amounts of
each).
The significant difference from the other variety�s seedlings is that nearly
half of these seedlings had either white collars and main petals or yellow
collars and main petals (22% white and 24% yellow). So the total for seedlings
having the same colour collar and outer petals is high and equal to the number
of white/white and yellow/yellow flowers.
Only six of the 91 seedlings had no collar petals. The seedlings selected for
growing in 2005 were either all yellow or all white (one which had dark red main
petals and white/pink collar petals was selected but the label was separated
from the plant in a gale).