Exogenous plant growth regulators for tomatoes under high temperatures and humid conditions [in Malaysia]
2007
Hassan, S.A. | Asiah, A.M. | Effyanti, M.S., Universiti Putra Malaysia, 43400 Serdang, Selangor (Malaysia). Dept. of Crop Science
The effect of environmental stress on growing tomato under high technology system under protective environmental structures at lowland areas as proposed by Malaysia Agriculture Policy need to be studied so that the implementation would sustain under lowland conditions, high humidity and high temperatures easily prevail when protective environmental structures are used. Thus, alternative measures to improve productivity of tomato grown under such conditions are needed. Hormones had been identified as important regulatory agents involved in fruit formation. Thus, a study was carried out to determine flowering and fruit set of hybrid tomato cultivars grown in netted rain shelter under lowland conditions as affected by exogenous hormone application. Imported and local hybrid tomato cultivars namely Batu King and Alboran (imported) and Ehsan 2 (local) were planted and placed under netted rain shelter. Three plant growth regulators (PGR), chlorophenoxyacetic acid (CPA), gibberellin (GA3) and paclobutrazol were applied as recommended. Treatments were arranged in completely randomized design. Flowering and fruit set including days to first flower, number of flowers, number of undeveloped and marketable fruits were determined up to 5 clusters. The imported hybrids, Alboran and Batu King cultivars exhibited better heat-tolerance than local hybrid, Ehsan 2. Hence, these cultivars are more suitable under netted rain shelter. Exogenous plant growth regulator CPA was the most effective to improve fruit set and fruit weight under high temperature and humid conditions.
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