The effect of root temperature on development of small fruiting sultana vines
DOI:
https://doi.org/10.5073/vitis.1966.5.345-350Abstract
Sultana vines were grown in solution culture for eight weeks from budburst with root temperatures kept at 11, 20, or 30 °C. Air temperatures were common to all treatments and fluctuated between a minimum of 20 °C at night and a maximum of 35 °C in the day.The growth of shoots, roots, and infloroscenres increased with increasing root temperature. With roots at 30° C growth continued throughout the experiment; with roots at 20° growth practically stopped when the vines flowered, about four weeks after the experiment began; with roots at 11 °C very little growth occurred.
The distribution of dry matter between the various plant parts differed between the different root temperatures; vines with roots at 30 °C had the highest shoot/root ratio.
The percentage of flowers which set on plants with roots at 30 °C was more than twice that on plants with roots at 20 °C; with roots at 11 °C either very few berries set or the bunches died.
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