Malays. Appl. Biol. (June 2002) 31(1): 31-35
EFFECT OF DURATION OF TWO PRECOOLING TEMPERATURES
ON SUBSEQUENT GROWTH AND FLOWERING OF TWO
SELECTED TULIP CULTIVARS
THOHIRAH, L.Ai., JOHARI, £2. and WONG, C.C.i
department of Crop Science, Faculty of Agriculture,
department of Process & Food Engineering, Faculty of Engineering,
Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia.
ABSTRACT
A study was conducted to examine the effects of duration and precooling temperature on the subsequent growth and flowering of two selected tulip cultivars, namely White Dream and Yokohama. The bulbs were precooled at 2 different temperatures (5°C and 9°C) for 5 durations (9, 10, 11, 12, and 13 weeks). The experimental design used was a split-split plot design replicated three times as randomized block. The parameters measured were initial plant height, final plant height, first internode length, last internode length, perianth length, number of days to first visible bud, coloured bud stage, number of days to anthesis, flower diameter and flower longevity. Total stem elongation (plant height, first internode, last internode, and perianth length) was significantly affected by variety. Perianth length, number of days to coloured bud stage, number of days to anthesis and flower longevity were significantly affected by temperature. Last internode length, perianth length and flower longevity were not influenced by duration of precooling. There were also significant interaction between variety and temperature, and temperature and duration for some parameters evaluated. Results showed that the optimal keeping duration for 5°C and 9°C precooling temperature were 9 and 11 weeks respectively for both White Dream and Yokohama.
ABSTRAK
Satu kajian telah dijalankan untuk menentukan kesan jangkamasa dan suhu prasejukkan ke atas pertumbuhan dan pembungaan dua jenis bunga tulip yang terpilih. Dua jenis kultivar tulip iaitu White Dream dan Yokohama telah diprasejukkan pada 2 suhu yang berlainan (5°C dan 9°C) bagi 5 jangkamasa (9, 10, 11, 12, dan 13 minggu). Rekabentuk eksperimen yang digunakan adalah rekabentuk 'split-split plot' dengan tiga replikasi dalam blok rawak. Parameter-parameter yang diukur termasuk tinggi pokok permulaan, tinggi pokok, panjang internod pertama, panjang interned terakhir, panjang perianth, bilangan hari untuk pengeluaran kudup bunga pertama, pewarnaan kudup dan bilangan hari untuk antesis, diameter bunga dan hayat jambangan bunga. Panjang tangkai (tinggi pokok, panjang internode pertama dan terakhir) dipengaruhi dengan bererti oleh varieti. Panjang perianth, bilangan hari kepada fasa pewarnaan kudup, bilangan hari untuk antesis dan hayat jambangan bunga dipengaruhi oleh suhu dengan berertinya. Tetapi panjang internod terakhir, panjang perianth, dan hayat jambangan bunga tidak dipengaruhi oleh jangkamasa prasejukkan. Adalah didapati bahawa terdapat interaksi yang bererti di antara varieti dan suhu, dan suhu dan jangakmasa prasejukkan untuk beberapa parameter yang telah dikaji. Keputusan menunjukkan bahawa jangkamasa prasejukkan yang optimum pada suhu 5°C dan 9°C ialah 11 dan 9 minggu masing-masing untuk tulip White Dream dan Yokohama.
Key words: Duration, storage temperatures, growth, flowering, tulip.
REFERENCES
Aoba, T. 1976. Effects of temperature on bulb and tuber formation in bulbous and tuberous Crop. IX. On the Bulb Formation in Tulip. Bulletin of the Tamagata University Agricultural
Science, 7: 387-399. (In Japanese with English Summary). (1976)
Aung, L.H. and De Hertogh, A.A. 1979. Temperature regulation of growth and endogenous absisic acid like content at Tulipa gesneriane L. Physiol Plant. 63: 1111-1116.
De Hertogh, A.A. 1977. Holland bulb forcer's guide. The Netherlands flower bulb institute, New York.
Edwards, D.A.C. and Rees, A.R. 1975. An analysis of the growth of forced tulips. 2 effects of low temperature treatments during development on plant structure at anthesis. ScientiaHorticulturae. 3: 373-381.
Le Nard, M. and Cohat, J. 1968. Influence des temperatures de conservation sur 1'elongation, la floraison et la bulbification de la tulipe. (Tulipa gesneriana L.) Ann. Amelior. Plant., 18: 181-215
Moe, R. and Wickstroom, A. 1973. The effect of storage temperature on shoot growth, flowering, and carbohydrate metabolism in tulip bulbs. Physiol Plant, 28: 81-87.
Rees, A.R. 1972. The Growth of Bulbs. Academic Press, London.
Thohirah, L.A. and Wong C.C. 1999. Effects of different day/night temperature on vegetative growth and flowering of 'Cassini' tulip. Agro-search. 6(2): 7-9.
