Effect of temperature on sprouting and hormonal content of potato tubers.
1985
Gonzal L.R.
At 10 and 20 C, some apical buds showed slight spasmodic growth, none was observed for tubers kept at 5 C for one month. Continuous bud growth in tubers stored at 10 and 20 C commenced two to three weeks after temperature treatment while buds on tubers kept at 5 C remained quiescent for 6 weeks regardless of the varieties. Strong apical dominance was exhibited by tubers of var. Red Pontiac and Univeta kept at 10 to 20 C. Significant differences in abscissic acid-like content was observed in tubers of the different varieties kept at 10 and 20 C. Highest level of ABA-like substances was observed in tubers stored at 5 C. However, concentration of the inhibitor decreased with length of storage except var. Red Pontiac which showed an increase of 32% in ABA-like content two months after low temperature treatment. Gibberellin-like content of the tubers was lowest in var. (11.1672 microgram/g.d.w.) stored at 10 C for one month. Tubers of variety Ilona kept at 10 C for one month gave the highest GA/ABA ratio (253.26) while the lowest was obtained in tubers of var. Cosima kept at 5 C for one month (1.08). Significant increase in GA/ABA ratio of tubers kept at 5 C for two months coincided with the onset of sprouting in most varieties at this temperature.
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