Characterization of a wilty sunflower (Helianthus annuusL.) mutant II. Water relations, stomatal conductance, abscisic acid content in leaves and xylem sap of plants subjected to water deficiency

Thirty-month-old 'Pêra' orange trees grafted on 'Rangpur' lemon trees grown in 100 L pots were submitted to water stress by the suspension of irrigation. CO2 assimilation (A), transpiration (E) and stomatal conductance (g s) values declined from the seventh day of stress, although the leaf water potential at 6:00 a.m. (psipd) and at 2:00 p.m. (psi2) began to decline from the fifth day of water deficiency. The CO2 intercellular concentration (Ci) of water-stressed plants increased from the seventh day, reaching a maximum concentration on the day of most severe stress. The carboxylation efficiency, as revealed by the ratio A/Ci was low on this day and did not show the same values of non-stressed plants even after ten days of rewatering. After five days of rewatering only psi pd and psi2 were similar to control plants while A, E and g s were still different. When psi2 decreases, there was a trend for increasing abscisic acid (ABA) concentration in the leaves. Similarly, stomatal conductance was found to decrease as a function of decreasing psi2. ABA accumulation and stomatal closure occurred when psi2 was lower than -1.0 MPa. Water stress in 'Pera´ orange trees increased abscisic acid content with consequent stomatal closure and decreased psi2 values.

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The Effects of Partially Drying Part of the Root System ofHelianthus annuuson the Abscisic Acid Content of the Roots, Xylem Sap and Leaves

Journal of Experimental Botany ◽

10.1093/jxb/40.10.1113 ◽

1989 ◽

Vol 40 (10) ◽

pp. 1113-1120 ◽

Cited By ~ 49

Author(s):

T. F. NEALES ◽

A. MASIA ◽

J. ZHANG ◽

W J. DAVIES

Keyword(s):

Abscisic Acid ◽

Root System ◽

Acid Content ◽

Xylem Sap ◽

Abscisic Acid Content

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Abscisic Acid Content, Transpiration, and Stomatal Conductance As Related to Leaf Age in Plants of Xanthium strumarium L.

PLANT PHYSIOLOGY ◽

10.1104/pp.58.2.169 ◽

1976 ◽

Vol 58 (2) ◽

pp. 169-174 ◽

Cited By ~ 46

Author(s):

Klaus Raschke ◽

Jan A. D. Zeevaart

Keyword(s):

Abscisic Acid ◽

Stomatal Conductance ◽

Acid Content ◽

Leaf Age ◽

Xanthium Strumarium ◽

Abscisic Acid Content

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Effect of ethylene perception inhibitor on growth, water relations, and abscisic acid content in wheat plants under water deficit

Russian Journal of Plant Physiology ◽

10.1134/s1021443712040127 ◽

2012 ◽

Vol 59 (4) ◽

pp. 573-580 ◽

Cited By ~ 6

Author(s):

G. V. Sharipova ◽

D. S. Veselov ◽

G. R. Kudoyarova ◽

M. D. Timergalin ◽

S. Wilkinson

Keyword(s):

Abscisic Acid ◽

Water Deficit ◽

Water Relations ◽

Acid Content ◽

Abscisic Acid Content

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Drought Response of Young Apple Trees on Three Rootstocks. II. Gas Exchange, Chlorophyll Fluorescence, Water Relations, and Leaf Abscisic Acid

Journal of the American Society for Horticultural Science ◽

10.21273/jashs.122.6.841 ◽

1997 ◽

Vol 122 (6) ◽

pp. 841-848 ◽

Cited By ~ 35

Author(s):

R. Thomas Fernandez ◽

Ronald L. Perry ◽

James A. Flore

Keyword(s):

Abscisic Acid ◽

Chlorophyll Fluorescence ◽

Drought Stress ◽

Gas Exchange ◽

Water Relations ◽

Acid Content ◽

Recovery Period ◽

Leaf Conductance ◽

Apple Trees ◽

Abscisic Acid Content

`Imperial Gala' apple trees (Malus ×domestica Borkh.) on M.9 EMLA, MM.111, and Mark rootstocks were subjected to two drought-stress and recovery periods in a rainshelter. Water relations, gas-exchange parameters per unit leaf area and per tree, chlorophyll fluorescence, and leaf abscisic acid content were determined during each stress and recovery period. Whole-plant calculated gas exchange best indicated plant response to drought stress, with consistent reductions in CO2 assimilation, transpiration, and leaf conductance. Variable and maximal chlorophyll fluorescence and fluorescence quenching were not as sensitive to stress. Other fluorescence parameters showed little difference. The most consistent decreases due to stress for gas exchange per square meter were in transpiration and leaf conductance, with few differences in CO2 assimilation and fewer for mesophyll conductance, internal CO2 concentration, and water-use efficiency. Leaf water potential was consistently lower during drought stress and returned to control values upon irrigation. Leaf abscisic acid content was higher for drought-stressed trees on M.9 EMLA than control trees during the stress periods but inconsistently different for the other rootstock treatments. Trees on M.9 EMLA were least affected by drought stress, MM.111 was intermediate, and Mark was the most sensitive; these results are consistent with the growth data.

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