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Tropentag, September 14 - 16, 2022, Prague

"Can agroecological farming feed the world? Farmers' and academia's views."


Accelerated rhizome forming and abscisic acid in sacred lotus cut flower by low night water temperature

Sornnarin Suangto1,2, Soraya Ruamrungsri2, Panupon Hongpakdee1

1Khon Kaen University, Dept. of Horticulture, Thailand
2Chiang Mai University, Dept. of Plant and Soil Science, Thailand


Abstract


The environmental factors which play an important role in the dormancy stage of Sacred lotus (Nelumbo nucifera Gaertn.), the tropical aquatic cut flower, are the temperature and photoperiods. Changes of temperature partially induced the fluctuation of endogenous phytohormone which affect plant growth and development, resulted in poor growth and also reduced flower yields in mild winter of Thailand. To clarify this temperature effect, the experiment was conducted in CRD for 3 months under 3 ranges of low night water temperature (LNT), i.e., ambient temperature (25°C) for being a control treatment, 20°C (LNT 20°C) and 15°C (LNT 15°C) by chilling unit. the data was collected in 2 stages, i.e., 45 days after treatments (DAT) and 90 DAT. Phytohormone as abscisic acid (ABA) were investigated following each experiment periods. It was found that the 20°C LNT suppressed the plant vegetative growth with fewer leaves number, leaf area, and leaf dry weight, while the leaf was absent when the plant receives 15°C LNT. Both LNTs stimulated the growth of underground part. 20°C LNT gave the higher stolon elongation, greater stolon diameter and more rhizome girdling, while the 15° LNT gave longer internode. Both LNTs induced more dry weight distribution to the stolon and higher accumulation of ABA concentration than the ambient temperature in all parts (leaf, stolon, node). 20°C LNT gave higher ABA concentration in stolon part while 15°C gave higher ABA concentration in leaf and node part. The greatest accumulation of ABA was occurred in stolon part of 20°C LNT. While 15°C LNT resulted in highest ABA distributed to the node part of the plant. This finding might be beneficial information for developing sacred lotus as a cut flower for off-season production.


Keywords: Abscisic acid, Nelumbo nucifera Gaertn., rhizome yields, water cooling


Contact Address: Panupon Hongpakdee, Khon Kaen University, Dept. of Horticulture, 123/2011, 40002 Khon kaen, Thailand, e-mail: panupon@kku.ac.th


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