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Polyamines are thought to play a role in the control of inherent or environmentally-induced growth rates of plants. To test this contention, we grew plants of four grass species, the inherently fast-growing Poa annua L. and Poa trivialis L. and the inherently slow-growing Poa compressa L. and Poa pratensis (L.) Schreb., at three levels of nitrate supply. Firstly, plants were compared when grown with free access to nitrate, allowing the plants to grow at their maximum relative growth rate (RGRmax). Secondly, we compared the plants when grown with relative nitrate addition rates of 100 and 50 mmol N (mol N)−1 day−1 (RAR100 and RAR50, respectively). |
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