ISHS Acta Horticulturae 319: International Symposium on Transplant Production Systems
WATER-STRESS-RESISTANT CITRUS SEEDLINGS SUITABLE FOR FRUIT PRODUCTION UNDER GREENHOUSE AND PLANT FACTORY CONDITIONS |
| Authors: | H. Yakushiji, H. Nonami, K. Sakai, T. Fukuyama, S. Ono, T. Yuasa, Y. Hashimoto |
| Abstract:
The drought-resistance of 5 varieties of citrus plants was studied by measuring the water status of tissues while being subjected to water stress induced by both withholding water and by creating salt stress, using hydroponic culture. The five varieties used in the present study were Citrus sunki hort. ex Tanaka, Citrus tachibana Tanaka, Citrus tangerina hort. ex Tanaka, Poncirus trifoliata Ref., and Citrus depressa Hayata. When they were grown in water deficient soils, stem turgor of Poncirus trifoliata and Citrus tangerina was maintained at a higher level than that of the other three citrus varieties, and thus, Poncirus trifoliata and Citrus tangerina had higher capabilities of osmoregulation in response to a decrease in soil water content. When water stress was applied by transplanting seedlings in NaCl solution or CaCl2 solution, leaf turgor of all citrus varieties decreased. However, at the 120th hr after the application of the Ca-salt stress, the leaf turgor of Poncirus trifoliata and Citrus tangerina recovered to the same level as before the salt stress was applied. In Na-salt solution, Poncirus trifoliata could not recover leaf turgor, but Citrus tangerina recovered leaf turgor. Characteristics of ionic permeability through the root tissue with respect to NaCl and CaCl2 were different in 5 citrus varieties. Considering physiological characteristics of drought-tolerance and salt-stress resistance, Citrus tangerina seedlings seem to be best suited for a citrus rootstock for hydroponic culture of citrus cultivation under plant factory or greenhouse conditions. | |
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