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No.66 (2019/12) >

Title :Crassulacean Acid Metabolism Photosynthesis in Pineapple (Ananas comosus (L.) Merr.) Grown under Hydroponic Culture
Authors :Horie, Miki
Takaragawa, Hiroo
Kawamitsu, Yoshinobu
Issue Date :31-Dec-2019
Abstract :In order to shorten the cultivation period of pineapple, a crassulacean acid metabolism (CAM) plant, it is important to increase the rate of CO2 exchange rate and improve dry matter production, especially at the early growth stage. When plants are grown under hydroponic conditions, absorption of nutrients and plant water availability are generally increased, and in the case of CAM plants, hydroponics could be expected to improve growth rate through promoting stomatal open during daytime. The objective of this study was to examine the effect of culture method (hydroponic and soil culture) on diurnal changes in gas exchange rate and CO2 balance in pineapple. The daily CO2 balance under hydroponics tended to be higher than under soil culture, especially in Phase-4. This was due to a shortened Phase-3 and a prolonged Phase-4 under hydroponics compared to soil culture. In Phase-4, the CO2 exchange rate was significantly correlated with stomatal conductance, indicating CO2 balance was affected by stomatal activity. Rubisco consumption activated under hydroponic culture may have shortened the duration of Phase-3 when stomatal opening was suppressed. The CO2 balance tended to be increased because of the shortening of Phase-3, resulting in higher dry matter productivity. From these results, it is suggested that hydroponic culture could promote growth in pineapple. However, net assimilation rate under soil culture was equivalent to that under hydroponics. Further study is needed to reveal the relationship between hydroponic cultivation and whole-plant photosynthetic ability.
Type Local :紀要論文
ISSN :0370-4246
Publisher :琉球大学農学部
URI :http://hdl.handle.net/20.500.12000/46991
Appears in Collections:No.66 (2019/12)

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