The major growth current through lily pollen tubes enters as K+ and leaves as H+ |
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Authors: | Manfred H Weisenseel Lionel F Jaffe |
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Institution: | (1) Biology Department, Purdue University, 47907 Lafayette, IN, USA;(2) Present address: Botanisches Institut, Universität Erlangen-Nürnberg, D-8520 Erlangen, Federal Republic of Germany |
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Abstract: | Growing lily (Lilium longiflorum Thunb.) pollen always drive a current into their tubes and out of their grains. The only external ions needed for growth (and the growth current) are K+, H+, and Ca2+. Increases in K+ immediately stimulate the current; while decreases in K+ immediately inhibit it. Comparable changes in H+ have the opposite effect; while those in Ca2+ have very little effect. We infer that most of the steady growth current is carried in by a potassium leak and out by a proton pump; but other considerations indicate that a minor, but controlling, component of the inward current consists of calcium ions. |
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Keywords: | Pollen tubes Growth current Potassium leak Proton pump Lilium |
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