The effect of photoperiod on flowering and TPS production in the warm tropics |
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Authors: | Cornelia J M Almekinders |
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Institution: | (1) International Potato Center, P.O. Box 5969, Lima, Peru;(2) Present address: Department of Field Crops and Grassland Science, Wageningen Agricultural University, Haarweg 333, 6709 RZ Wageningen, The Netherlands |
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Abstract: | Summary Three similar field experiments with five cultivars were carried out to evaluate the effect of a 5-hour extension of the natural
daylength and a 3-hour night break on flowering and TPS production in the warm tropics. Shoot length, number of inflorescence
positions per plant and number of flowers per inflorescence varied considerably between the experiments. In each experiment,
the supplementary photoperiods delayed cessation of shoot growth and thereby increased the orders of branching and the number
of inflorescence positions per plant. The photoperiod treatments significantly increased the number of flowers at the last
produced inflorescence positions, but not at other ones. Pollen production and quality, berry set, seed set and 100-seed weight
were not affected by the photoperiod treatments. TPS production was characterized by variability in flowering and low and
variable seed production per flower. |
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Keywords: | shoot length branching inflorescence position tuber production |
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