Characteristics of photosynthesis and respiration rates in strobili of Pinus koraiensis S. et Z.
1988
Han, S.B. (Kangwon Univ., Chunchon (Korea R.). Coll.of Forestry) | Kim, Y.M. (Inst. of Forest Genetics, Suwon (Korea R.))
The dark respiration, photosynthesis (CO2 refixation), CO2 balance and chlorophyll content of 1st-year conelets and 2nd-year cones of Korean pine (Pinus koraiensis S.et.Z.) were investigated after pollination up to the end of maturation. The growth of 1st-year conelet was 3.6cm in length, 2.4cm in diameter and 3.05g in dry weight during the first year. The growth of 2nd-year mature cone was 13.5cm in length, 9.3cm in diameter and 141.0g in dry weight in the late 2nd-year. The refixation of carbon dioxide released from a cone by the dark respiration was less than 50% at light saturation through the growing period. The refixation of carbon dioxide released by dark respiration for one year was 7.3% in 1st-year conelets and 8.7% in 2nd-year cones. The dark respiration rate of cones by increasing temperature increased rapidly with increasing temperature up to 25 deg C. The dark respiration rate of cones was much higher in non-growing season than that in growing season at the same temperature. The rates of dark respiration and CO2 refixation, based on the dry weight, were much higher in 1st-year conelet than in 2nd-year cone. The CO2 balance for a cone was negative from pollination to the end of maturation. The net dark respiration loss for a cone was 7.23g CO2/year in 1st-year conelet and 164.8g CO2/year in 2nd-year cone. The respiratory loss efficiency for a cone (=CH2O weight calculated by net dark respiration/dry weight of cone) for one year was 1.61 in 1st-year conelet and 0.81 in 2nd-year cone for one year.
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