Nitrogen Deficiency Slows Leaf Development and Delays Flowering in Narrow-leafed Lupin |
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Authors: | MA QIFU; LONGNECKER NANCY; DRACUP MILES |
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Institution: | Cooperative Research Centre for Legumes in Mediterranean Agriculture, University of Western Australia, Nedlands, Western Australia, 6907 Soil Science, University of Western Australia, Nedlands, Western Australia, 6907 Agriculture Western Australia, Locked Bag 4, Bentley, Western Australia, 6983 |
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Abstract: | Effects of nitrogen (N) supply on leaf and flower developmentinLupinus angustifolius L. cv Merrit were examined in a temperature-controlledglasshouse. Low N supply (0.05 or 0.4 mM N) had little effecton leaf initiation but slowed leaf emergence on the main stemcompared with plants receiving high N supply (6.0 or 6.4 mMN), or with symbiotic N2-fixation. Plants experiencing transientN deficiency had slower leaf emergence than plants with a continuoussupply of 6.4 mM N. Nitrogen supply did not affect the timeof floral initiation, which occurred within 4 weeks of sowing,by which time nine to ten leaves had emerged. However, the floweringof low-N plants was delayed by 68 to 220 °C d (i.e. 414d) even though they had fewer leaves. The effect of N deficiencyon flowering time was largely a result of slower leaf emergence. Lupinus angustifolius L.; nitrogen; leaf; flower initiation; thermal time; plastochron; phyllochron |
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