 Hawaii Cooperative Extension Service
History of SelectionsA 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 ere ct 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 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.
Characteristics of ProgeniesTable 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 average between 20.3 to 22.2 for all crosses. K1088 (UH507) produced pseudobulbs averaging 42.2 inches, as compared to 34.6 inches for K1081. One of the undesirable features of UH507 is the tall pseudobulbs.
Table 1. Performance of progenies K1078, K1080, K1081 and K1088. CHARACTERISTICS K1078 K1080 K1081 K1088 Flower length (in) 2.08 b* 2.06 b 2.30 a 1.96 b Flower width (in) 2.42 b 2.43 b 2.58 a 2.20 c Petal length (in) 1.50 b 1.47 bc 1.58 a 1.40 c Petal width (in) 0.66 b 0.64 bc 0.72 a 0.61 c Pedicel length (in) 1.53 b 1.56 b 1.65 a 1.48 b Pseudobulb height (in) 33.0 b 31.1 b 34.6 b 42.2 a Scape length (in) 6.6 bc 8.5 a 7.4 b 6.0 c Spray length (in) 21.2 b 27.1 a 23.5 ab 23.2 b No. flowers per spray 17.6 b 17.2 b 18.6 a 18.2 a Percent bud drop 1.2 1.2 1.4 1.5 Half-life of sprays 20.3 a 21.1 a 22.2 a 21.7 a (days)*Mean separation by Duncan's multiple range test. Any two means having a common letter are not significantly different at the 5 percent level.
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. Furthermore, the flowering peaks did not always coincide with those of K1088. Table 2. Total spray yield per plant from 1988 to 1992 for K1078, K1080, K1081 and K1088. MONTH K1078 K1080 K1081 K1088 Jan 1.1 0.5 1.5 0.7 Feb 1.6 1.3 1.4 1.8 Mar 0.8 1.6 1.0 0.9 Apr 1.6 1.2 1.6 1.2 May 2.0 3.4 3.1 3.2 Jun 3.7 4.3 5.4 3.4 Jul 4.6 3.0 4.5 3.8 Aug 3.2 3.0 3.2 4.5 Sep 2.1 1.8 2.2 4.0 Oct 2.2 1.6 1.3 1.4 Nov 1.6 1.0 2.3 1.2 Dec 1.3 1.4 2.6 1.1 TOTAL 25.8bc* 24.1c 30.1a 27.2ab**Mean separation by Duncan's multiple range test. Any two means having a common letter are not significantly different at the 5 percent level.
Characteristics of D. Uniwai Royale, UHK1081Among the four crosses evaluated, K1081 performed the best in practically all characteristics.
Dept. of Horticulture
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