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Valeur, Johan, 2020. Promoting lateral bud growth in sweet potato (Ipomoea batatas) : comparing the foliar application of synthetic phytohormone and coconut water. First cycle, G2E. Alnarp: SLU, Dept. of Biosystems and Technology (from 130101)



Sweet potato (Ipomea batatas) is an important crop grown worldwide with a rising interest in production in Europe and Sweden. Swedish producers are looking for ways to grow the crop but are facing problems because of low-quality slips from import which leads to a non-profitable production. This inadequate supply becomes a bottleneck for Swedish farmers. A Swedish propagation of slips would be beneficial to Swedish growers but in order to make such a production effective a solution to break the sweet potato's strong apical dominance is needed. Apical dominance is mainly controlled by auxin supply from the apical meristem. Cytokinin is a phytohormone that promotes lateral bud growth and can therefore also be used to aid the breaking of apical dominance.
Although a lot is known about apical dominance there are a lot of unknown factors playing into how it is truly controlled. Coconut water (CW) is a natural, safe and organic biostimulant with enough phytohormones to affect other plants. An experiment was conducted where cuttings of sweet potato rooted in pumice stone and sprayed with a synthetic cytokinin (BAP) or a 20% dilution of CW in order to stimulate lateral bud growth. A control group without any treatment was also made. Every cutting in the experiment had its apex bud removed in order to cut off the main auxin supply. The results showed a 27% higher rate of stimulated lateral buds with BAP treatment and a 20% higher rate with the CW treatment compared to the cuttings without any treatment. The study is too small to prove a correlation but it’s enough to show an indication that these biostimulants might stimulate later bud growth. This indication can be used to motivate a study on a bigger scale.

Main title:Promoting lateral bud growth in sweet potato (Ipomoea batatas)
Subtitle:comparing the foliar application of synthetic phytohormone and coconut water
Authors:Valeur, Johan
Supervisor:Karlen, Helena
Examiner:Khalil, Sammar
Volume/Sequential designation:UNSPECIFIED
Year of Publication:2020
Level and depth descriptor:First cycle, G2E
Student's programme affiliation:LY003 Horticultural Science Programme 300 HEC
Supervising department:(LTJ, LTV) > Dept. of Biosystems and Technology (from 130101)
Keywords:sweet potato, Ipomea batatas, apical dominance, phytohormones, coconut water, foliar application, biostimulant, vegetative propagation
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Subject. Use of subject categories until 2023-04-30.:Crop husbandry
Deposited On:28 Oct 2021 09:17
Metadata Last Modified:29 Oct 2021 04:01

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