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http://dx.doi.org/10.12791/KSBEC.2013.22.4.361

Analysis on on the Leaf Growth and Changes of Photosynthetic Characterization by Leaf Position in 'Changhowon Hwangdo' Peach  

Yoon, Ik Koo (National Institute of Horticultural & Herbal Science)
Yun, Seok Kyu (National Institute of Horticultural & Herbal Science)
Jun, Ji Hae (National Institute of Horticultural & Herbal Science)
Nam, Eun Young (National Institute of Horticultural & Herbal Science)
Kwon, Jung Hyun (National Institute of Horticultural & Herbal Science)
Bae, Hae Jin (National Institute of Horticultural & Herbal Science)
Moon, Byung Woo (M.Horticultural Technique Research Institute)
Kang, Hee Kyoung (Department of Horticulture, Kongju National University)
Publication Information
Journal of Bio-Environment Control / v.22, no.4, 2013 , pp. 361-365 More about this Journal
Abstract
To investigate factors determining peach fruit quality, chlorophyll content by leaf positions, chlorophyll content of foliated leaf, change of leaf area, and photosynthetic capacity were monitored. Photosynthetic rate in response to radiation intensity and $CO_2$ concentration, and change of sucrose content after shading treatment also were investigated. Chlorophyll content was similar in $5-12^{th}$ leaves after 10 days of foliation, while young $13-16^{th}$ leaves showed lower chlorophyll contents. Chlorophyll content was 2.56 ${\mu}g/cm^2$ on May $28^{th}$, just after foliation, and rapidly increased up to 6.35 ${\mu}g/cm^2$ on June $12^{th}$. After this point, chlorophyll content gradually increased during two months showing the highest value of 9.03 ${\mu}g/cm^2$ on August $14^{th}$. Leaf area was 27.1 $cm^2$ just after foliation and 37.7 $cm^2$ on $10^{th}$ day of foliation increasing 10.6 $cm^2$ during 10 days. Leaf area slowly increased by 3.9 $cm^2$ during next one month. Photosynthetic capacity increased rapidly until the $30^{th}$ day of foliation showing the highest capacity of 13.8 ${\mu}mol/m^{-2}/sec^{-1}$. After this point, photosynthetic capacity decreased sharply. Photosynthetic rate in response to radiation intensity increased rapidly until the PPFD reached to 600 ${\mu}mol/m^{-2}/sec^{-1}$ and increased gradually from 600 ${\mu}mol/m^{-2}/sec^{-1}$ to 1200 ${\mu}mol/m^{-2}/sec^{-1}$ of PPFD and stayed stable beyond this point. Photosynthetic rate in response to $CO_2$ concentration increased until 600 ppm of $CO_2$. At higher $CO_2$ concentration, photosynthetic rate stayed stable or decreased. Sucrose content in leaves was not significantly different between control and shading group until one hour of shading treatment while decreased in shading group after two hours of treatment.
Keywords
$CO_2$; chlorophyll; leaf area; shade; sucrose;
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