Shoot Resistance to Water Flow in Cotton |
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Authors: | MERON, M. GRIMES, D. W. PHENE, C. J. HUTMACHER, R. B. |
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Abstract: | Studies using excised cotton (Gossypium hirsutum L.) plants,attached to a free water source and undergoing transpirationcycles, were conducted at intervals over a 2 year period inorder to quantify shoot resistance components of cotton canopies.Leaf water potential was found to be a linear function of transpirationrate at rates above 0.1 mm h1, so shoot resistance wasevaluated as the slope of this function. The value of 4.8 104h (0.48 MPa h mm1) total shoot resistance was consistentfor 1.10 m tall, well irrigated, fruit-bearing cotton plants.Further tests, with pre-wrapped and exposed leaves, revealedthat total shoot resistance was comprised of an axial component(40%) and a leaf component (60%). The total shoot resistanceof 0.48 MPa h mm1 is likely to be relevant for modellingcotton water relations when LWP is evaluated on exposed, topof the canopy leaves, such as in the big leaftype models. Key words: Leaf water potential, axial resistance, leaf resistance |
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