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Asian Journal of Plant Sciences
  Year: 2009 | Volume: 8 | Issue: 3 | Page No.: 212-217
DOI: 10.3923/ajps.2009.212.217
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Bract Size Enlargement and Longevity of Bougainvillea spectabilis as Affected by GA3 and Phloemic Stress

Mohammed Saifuddin, A.B.M. Sharif Hossain, Normaniza Osman and K.M. Moneruzzaman

A field experiment was conducted to assess the effect of gibberellic acid (GA3 100 and 150 ppm), phloemic stress and combination of 100 ppm GA3 and phloemic stress on Bougainvillea bract blooming, expansion, development and bract longevity under exposed sun light condition (400-700 ╬╝Em-2 sec-1). A seven-years-old Bougainvillea plant was used in this experiment. Fifteen selected brunches were applied with 100, 150 ppm GA3, phloemic stress, 100 ppm GA3+phloemic stress and water control. The results showed that 100 ppm GA3 increased the length of petiole, bract size and shape by 40%. Bract blooming was three days earlier in 100 ppm GA3 treated branches and 4 days earlier in 150 ppm GA3 than in water control. Bract longevity (required days from bract initiation to abscission) was higher for 4 in phloemic stress and for 2 days in 100 ppm GA3+phloemic stress than in water control. However, bract longevity was shorter in 100 and 150 ppm GA3 than in control. The number of bracts per branch was higher in 100 ppm GA3+phloemic stress and phloemic stress than the other treatments. Petal size and petiole length were the highest in 100 ppm GA3. But there were no significant changes in bract size and color development in phloemic stress. Maximum chlorophyll fluorescence was observed in phloemic stress. Quantum yield (Fv/Fm) was higher in phloemic stress and 100 ppm GA3+phloemic stress than in other treatments. The findings suggested that gibberellic acid played an important role to induce rapid bract blooming and expansion whereas, phloemic stress increased total number of bract and longevity.
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