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A
few seedlings from a self-pollinated progeny of Dendrobium
Jaquelyn Concert were received in 1969 from the late Ralph
Yagi of Maui. The seedlings were relatively uniform and produced
dark purple-red flowers on long erect flower stems. Chromosome
counts showed that they were tetraploid.
A
selected individual, JCS1-49, was self-pollinated in 1973,
and two seedlings, K327-16 and K327-7, were sib-mated in 1979
to produce a third generation inbred population, K634. The
inbred selection, K634-29, produced large, dark purple-red
flowers on erect flower stems.
In
1985 four crosses were made involving the inbred Jaquelyn
Concert K634-29 (S3), inbred white Jaquelyn Thomas,
K159-26 (S2), K671-16 (S3), and K672-18
(S4) and purple Jaquelyn Thomas, D168-12 as follows:
K1078 Jaquelyn Thomas, K672-18 x Jaquelyn Concert, K634-29
K1080 Jaquelyn Thomas, K671-16 x Jaquelyn Thomas, D168-12
K1081 Jaquelyn Thomas, K671-16 x Jaquelyn Concert, K634-29
K1088 Jaquelyn Thomas, D168-12 x Jaquelyn Thomas, K159-26
K1088
(= UH507) served as control. The parents of K1080 were similar
to K1088, except for the white Jaquelyn Thomas parents, K671-16
and K159-26. Both K1078 and K1081 were crosses between inbred
Jaquelyn Concert, K634-29, and inbred white Jaquelyn Thomas,
K671-16 or K672-18.
The
crosses were made in June, 1985, germinated in September,
1985, compotted in May, 1986, potted in 2-inch clay pots with
tree fern fiber in September, 1986 and repotted in gallon-size
plastic pots with No. 3 blue rock in June, 1987. Plants were
grown under 30 percent polypropylene shade and evaluated from
1987 through 1992.
Table
1 gives the characteristics of the four progenies under evaluation.
K1081 produced larger flowers than the other three crosses.
Scape length was slightly shorter than that of K1080, but
spray length was equal to that of K1080. The average number
of flowers per spray of 18.6 for K1081 was equal to that of
K1088 (UH507). Bud drop percent was low, and the half-life
of cut sprays averaged between 20.3 to 22.2 for all crosses.
The
total spray yield of K1081 was higher than that of K1078 and
K1080 and equal to that of K1088 (Table 2). In addition K1081
produced flowers throughout most of the year with a major
peak in June and a minor peak in December (Fig. 2). Furthermore,
the flowering peaks did not always coincide with those of
K1088.
K1088
(UH507) produced pseudobulbs averaging 42.2 inches, as compared
to 34.6 inches for K1081. One of the undesirable features
of UH507 is tall pseudobulbs.
Among
the four crosses evaluated, K1081 performed the best in practically
all characteristics. Relatively large purple flowers were
borne on erect sprays. Half-life of sprays was about 21 days.
Bud drop percent was low. Pseudobulbs were sturdy and relatively
short. Spray yield equaled that of UH507, and spread throughout
the year with lower peaks and valleys than that of UH507.
We are therefore naming K1081 (=UH1081) as Dendrobium Uniwai
Royale and making this cross available to dendrobium growers
for trial, possibly to complement the other purple flowered
Jaquelyn Thomas cultivars, UH503 and UH507.
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