Seasonal changes in stomatal responses of sweet cherry and plum to water status in detached leaves |
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Authors: | Tae Myung Yoon Hanno Richter |
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Institution: | Kyungpook Provincial Rural Development Administration, Donghodong200, Taegu, Republic of Korea;Botanisches Insl. der Univ. für Bodenkultur, A-1180 Wien, Austria. |
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Abstract: | Seasonal changes in the relationship between stomatal responses and water potential components in detached leaves of sweet cherry ( Prunus avium L. cv. Bigarreau Morreau) and plum ( Prunus domestica L. cv. Queen Victoria) were examined by the simultaneous measurement of stomatal conductance and water relation parameters derived from pressure-volume curves. The water potential threshold for stomatal closure in sweet cherry leaves throughout the season and in plum leaves until mid-July varied nearly in parallel with changes in the osmotic potential at the turgor loss point. From August onward, closing reactions of plum stomata had no relationship to the turgor loss point. Stomata of sweet cherry leaves opened more widely and showed slower reactions to dehydration early in the season than later. Seasonal changes of stomatal conductance and stomatal responses to dehydration in both species seem thus to be influenced by fruit development and ripening. |
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Keywords: | Photosynthesis plum pressure-volume curves Prunus avium Prunus domestica stomatal conductance sweet cherry water potential water stress |
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