Some Effects of Light Intensity and Temperature on Dry Weight and Shoot Growth of Grape-Vine
1968; Oxford University Press; Volume: 32; Issue: 4 Linguagem: Inglês
10.1093/oxfordjournals.aob.a084247
ISSN1095-8290
Autores Tópico(s)Fermentation and Sensory Analysis
ResumoPrerooted cuttings of grape-vine (Vitis vinifera L., cultivar Muscat Gordo Blanco, syn. Muscat of Alexandria) were grown in growth cabinets for 13 weeks after bud-burst. Environmental conditions were light intensities of 3600 foot candles (f.c.), 18oo f.c., and 9oo f.c. in all combinations with temperatures of 30 °C day/25 °C night, 25 °C/20 °C, and 20 °C/15 °C. Daylength with both fluorescent and incandescent lighting was 16 h with 8-h nights. Measurements of main and lateral shoot lengths, leaf numbers, and leaf areas were made at weekly intervals for 9 weeks. At 13 weeks the plants were harvested and dry weights of roots, parent canes, stems, and leaves measured. Dry weights increased with increasing light intensity and were greaert at 25 °C than at 20 °C or 30 °C. The new shoot: root ratio remained at approximately 7.o under all conditions, but increasingly more dry weight was in leaves and correspondingly less in stems with increased temperature. Stem lengths and leaf area values were in most cases greatest at 25 °C followed in turn by 30 °C and 20 °C values. Light intensity had no clear effect. Apical dominance increased with increasing temperature. Internode length was stable under all conditions. The erratic growth of lateral shoots was one factor making the results difficult to interpret.
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