Influence of rewatering and time of sampling on solute accumulation of two Populus deltoides clones

We investigated effects of rehydration and time of sampling on solute accumulation in plants of two greenhouse-grown Populus deltoides Bartr. clones (Ohio Red and Platte) subjected to multiple cycles of water stress. Osmotic potential of leaves at full turgor was measured at predawn on well-watered...

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Bibliographic Details
Published in:Tree physiology 1997-05, Vol.17 (5), p.341-346
Main Authors: Gebre, G.M, Brandle, J.R, Kuhns, M.R
Format: Article
Language:English
Subjects:
biosynthesis
clones
diurnal variation
fructose
genetic variation
glucose
irrigation
malic acid
mannose
myo-inositol
osmotic pressure
Populus deltoides
quantitative analysis
quinic acid
salicin
solutes
stress response
sucrose
water potential
water stress
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Summary:We investigated effects of rehydration and time of sampling on solute accumulation in plants of two greenhouse-grown Populus deltoides Bartr. clones (Ohio Red and Platte) subjected to multiple cycles of water stress. Osmotic potential of leaves at full turgor was measured at predawn on well-watered (control) and water-stressed (conditioned) plants that had been rewatered the previous afternoon. Water-soluble organic solutes (carbohydrates, phenolic glucosides and organic acids) were determined at both predawn and midday, before and after rewatering. Conditioning resulted in solute accumulation; however, rewatering of conditioned plants decreased the predawn concentration of glucose by 19-35% and the total solute concentration by 14-15%, relative to values before rewatering. There was a 52% increase in salicin concentration in response to rewatering in conditioned plants of the Platte clone. In conditioned plants of both clones, the concentration of glucose was generally lower at midday than at predawn (16-47%), whereas the concentration of sucrose was higher at midday than at predawn (46-133%). Time of sampling was an important factor in determining whether conditioning resulted in accumulation of glucose and fructose. Compared with control plants, there was a significant accumulation of glucose and fructose at predawn and either no accumulation or a significant reduction of these solutes at midday both before and after rewatering of conditioned plants. Sampling time also affected the amount of solute that accumulated in response to conditioning.
ISSN:0829-318X
1758-4469
DOI:10.1093/treephys/17.5.341