期刊
SCIENTIA HORTICULTURAE
卷 211, 期 -, 页码 26-33出版社
ELSEVIER
DOI: 10.1016/j.scienta.2016.08.003
关键词
Carbohydrates; Growth rate; Photoperiod; Shoot/root ratio; Strawberry; Temperature
类别
资金
- Norwegian Agricultural Agreement Research Fund/Foundation for Research Levy on Agricultural Products [225154/E40]
- European Union [679303]
In order to investigate the relationship between environmental conditions and vegetative growth and reproductive development in the strawberry, freshly rooted runner plants of the cultivar 'Sonata' were grown in a phytotron at temperatures of 12, 18 and 24 degrees C and photoperiods of 10 h short day (SD) and 20 h long day (LD) for 31 d and harvested at 10 d intervals. Plant dry weight and leaf area increases were exponential versus time, giving a linear regression with the natural log (In). This rendered the relative growth rate (RGR) constant over time at each environmental condition. Over the entire 31 d growth period, the RGR increased linearly with increasing temperature across the range of temperatures with a further 10-13% enhancement by LD. A maximum RGR value of 0.077 g/g/d was determined in LD at 24 degrees C. Increases in the RGR was driven by a combined increase in net assimilation rate (NAR) and leaf area ratio (LAR) and was associated with an increased allocation of dry matter production into leaves and less into crowns and roots. Because of this, the shoot/root ratio increased consistently with increasing temperature and photoperiod, which was also associated with a significant increase in the tissue C/N concentration ratio. Low temperature promoted starch accumulation markedly in all parts of the plants, with a further enhancement by LD conditions, while the concentrations of soluble sugars were less affected by the climatic environment. Forcing of plants exposed to the various growth conditions for 31 d showed that all plants at 12 and 18 degrees C and 80% of those at 24 degrees C had initiated flowers in SD, whereas none had initiated flowers in LD regardless of temperature conditions. All these results demonstrate an opposite environmental relationship between vegetative growth and reproductive development in the strawberry. (C) 2016 Elsevier B.V. All rights reserved.
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