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2022 Vol.40, Issue 1 Preview Page

Research Article

Generation of Adventitious Roots and Characteristics of Gas Exchange according to Leaf Number of Hemp (Cannabis sativa L.) Cuttings
Vu Phong Lam12†
,
Ricardo Hernandez3†
,
Jeongyeo Lee4
,
Sung Jin Kim1
,
Jongseok Park1*
1Department of Horticultural Science, Chungnam National University, Daejeon 34134, Korea
2Department of Agronomy, Tay Bac University, Son La 360000, Vietnam
3Department of Horticultural Science, North Carolina State University, Raleigh 27695, USA
4Plant Systems Engineering Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon 34141, Korea
*Corresponding Author
†These authors contributed equally to this work.
28 February 2022. pp. 30-38
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Abstract

In the hemp-seedling industry, the number of leaves on the harvested cuttings from mother plants is crucial for survival. Therefore, the present study determined the suitable number of leaves on hemp (Cannabis sativa L.) cuttings to promote adventitious root (AR) formation. Hemp cuttings with two, three, and four leaves were harvested from the apex of the mother plant. After disinfecting their base, 18 cuttings per replication were transplanted into a plug tray (72 holes) filled with a horticultural substrate. The photosynthetic characteristics of the cuttings and well-rooted hemp plants were measured at 22 and 60 days after transplantation (DAT), respectively. At 22 DAT, the average AR length, AR fresh weight, AR generation rate, and average number of ARs were the highest from two-leaf cuttings. Due to the higher AR generation, the net photosynthetic rate was the highest in cuttings with two-leaf cuttings at all the light intensity conditions (0, 50, 100, 175, 250, 500, 750, 1,000, and 1,500 µmol·m-2·s-1). The initial AR development of cuttings with two leaves likely enabled sufficient water uptake and photosynthesis to increase the survival rate. Growers may increase the productivity per unit area of well-rooted hemp plants by harvesting cuttings with two leaves.

Keywords
fresh weight
light intensity
net photosynthetic rate
root quality
well-rooted hemp plant
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Information
  • Publisher :KOREAN SOCIETY FOR HORTICULTURAL SCIENCE
  • Publisher(Ko) :한국원예학회
  • Journal Title :Horticultural Science and Technology
  • Journal Title(Ko) :원예과학기술지
  • Volume : 40
  • No :1
  • Pages :30-38
  • Received Date : 2021-06-01
  • Revised Date : 2021-11-10
  • Accepted Date : 2021-11-24
  • DOI :https://doi.org/10.7235/HORT.20220004
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