Tuber development, storage and germination in yams (<i>Dioscorea</i> spp.) in response to pre-harvest application of plant growth regulators

Wickham, Lynda D.; Passam, H. C.; Wilson, Lawrence A.

doi:10.1017/s0021859600042787

Cited by 6 publications

(1 citation statement)

References 6 publications

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“…The only other method for applying GA 3 that has been reported thus far is pre-harvest foliar spraying of D esculenta and D alata. 37,38 The drawback of foliar application is the inefficient use of GA 3 (225 g GA 3 ha −1 , calculated according to Wickham et al 38 ), because all tubers are treated and not only those that require treatment; additionally, a large amount of GA 3 is lost during application. The latter is also true of the spraying of tubers, and this was why it was rejected during our evaluation.…”

Section: Comparison To Alternative Gibberellic Acid Applicationsmentioning

confidence: 99%

Improving the application of gibberellic acid to prolong dormancy of yam tubers (Dioscorea spp)

et al. 2003

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With the aim of reducing the cost and time needed to treat yam tubers with gibberellic acid (GA 3 ), this study compared several new methods of application with the established dipping procedure (150 mg kg −1 for 1 h). Both GA 3 -containing soil paste (25 mg kg −1 ) and gelatinized starch (860 mg kg −1 ) were applied to tuber heads of Dioscorea alata and D cayenensis-rotundata in the Ivory Coast. Soil paste, gelatinized starch and dipping consistently prolonged dormancy and reduced fresh matter losses by 23-39% in D cayenensis-rotundata 3-year means. Although dipping reduced the storage losses most efficiently, soil paste and gelatinized starch used considerably less GA 3 . Both new treatments were easily prepared and quickly applied. Soil paste was most effective when the treatment was repeated before the end of dormancy. The third new method, spraying the tubers with a GA 3 solution (150 mg kg −1 ), was not effective. In general, the optimal time of application was immediately post-harvest. For D alata, treatment only 1 month after harvest was particularly ineffective, whereas D cayenensis-rotundata tubers could be treated with some effect up to the end of dormancy. To achieve extended storage periods of healthy tubers of D cayenensis-rotundata, GA 3 application may be recommended as post-harvest practice.

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Section: Comparison To Alternative Gibberellic Acid Applicationsmentioning

confidence: 99%