Journal
SOIL SCIENCE AND PLANT NUTRITION
Volume 49, Issue 6, Pages 883-888Publisher
JAPANESE SOC SOIL SCIENCE PLANT NUTRITION
DOI: 10.1080/00380768.2003.10410351
Keywords
aquaporin; barley; diurnal expression; root hydraulic conductivity; water transport at night
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Both root and shoot of barley seedlings showed continuous growth at night as well as in the daytime. Root hydraulic conductivity (Lp(r)) was monitored, and high Lp(r) values were recorded at night. For revealing the molecular mechanism, the presence of an aquaporin HvPIP2;1 in barley roots was investigated. The accumulation of the HvPIP2;1 transcript was mostly observed from the evening to the middle of the night. HvPIP2;1 protein was most abundant around midnight. As for tissue localization, HvPIP2;1 protein was abundant in cells involved in water transport. These results suggested the possible involvement of HvPIP2;1 in the mechanism of water transport in roots.
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