Diurnal Change in Water Droplets Adhering to Rice Panicles at the Booting Stage

Autor:	Katsuhiko Ikeda, Tetsuya Fujikawa, Makoto Tsuda
Rok vydání:	1994
Předmět:	geography geography.geographical_feature_category Liquid water Chemistry food and beverages Wetland Diurnal change Horticulture Agronomy Root pressure Evapotranspiration Genetics Agronomy and Crop Science Food Science Transpiration Panicle
Zdroj:	Japanese Journal of Crop Science. 63:131-136
ISSN:	1349-0990 0011-1848
DOI:	10.1626/jcs.63.131
Popis:	Many water droplets adhere to the surface of a rice panicle located inside the protective sheath of flag-leaf at the booting stage. Since the adhering water is formed by the exudation of liquid water from the plant, we can expect that the amount of adhering water varies diurnally with the change of root pressure. To test this hypothesis, we examined the amount of the adhering water and the bleeding sap from the cut surface of the stub for 24 hours. Wetland rice cultivars, Akenohoshi and Ukonnishiki, were grown under submerged and water stressed soil conditions. The amount of adhering water changed diurnally in response to the potential evapotranspiration : the amount increased during the night and decreased during the day. A similar trend was also found in bleeding rate, except under drought conditions where both bleeding and adhering water were negligible. Furthermore, the adhering water increased proportionally with the increase of bleeding sap during the night. Bleeding occurs when root pressure develops. These results suggest that the adhering water is formed through the efflux of water under root pressure during the night, and is lost by transpiration during the day.
Databáze:	OpenAIRE
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