Assessment of Dormancy and Sprouting Behavior of CIP Elite and Advanced Clones Under Different Storage Conditions in Uzbekistan

Abstract

In potato breeding and selection, storability should be regarded as equally important as yield, disease resistance, and quality. A study documenting the dormancy period, sprouting behavior, and weight loss of 17 International Potato Center potato elite and advanced clones was carried out in Tashkent, Uzbekistan, under cellar and cold store conditions, during 2008 and 2009. Ninety tubers of each of 17 clones were allocated to experimental units of 30 tubers each placed in trays and randomized in three replications following a random complete block design. Therefore, there were three replications of 30 seed tubers each per entry. The dormancy period ranged from 77 to 115 days and from 100 to 186 days under cellar and cold storage, respectively. There was a relatively high positive correlation (0.69) for dormancy period between storage systems, indicating that clones demonstrating longer and shorter dormancy periods under one system will also behave similarly under the other system. A negative correlation (−0.53 and −0.88) was found between dormancy period and length of the longest sprout in cellar and cold store, respectively, meaning that clones with shorter dormancy often showed a greater length of their longest sprout. The weight loss percentage per tuber was similar in both storage systems, from 5.0% to 8.0% in the cellar and from 5.0% to 9.8% in the cold store, although for different storage periods (an average of 110 and 166 days under cellar and cold storage conditions, respectively). The study indicated that under cellar conditions, clones with a longer dormancy period and slower rate of sprout growth have less weight loss during storage and therefore better keeping quality.

Effects of Physical, Mechanical and Hormonal Treatments of Seed-Tubers on Bud Dormancy and Plant Productivity

“…It has been observed in previous studies that multiple sprouting cultivars show a slower growth rate of their longest sprout [52]. In the case of Exp-1, irrespective of the variety, the longest sprout resulted in being associated with the highest number of sprouts per tuber longer than 2 mm, thus consistent with Carli et al [38] that did not find any correlation between number of sprouts and length of the longest sprout. Moreover, as regards genotype, the longest sprout was recorded in Europa and Spunta in accordance with results of Carli et al who reported that clones with shorter dormancy often showed a greater length of their longest sprout [38].…”

“…In the case of Exp-1, irrespective of the variety, the longest sprout resulted in being associated with the highest number of sprouts per tuber longer than 2 mm, thus consistent with Carli et al [38] that did not find any correlation between number of sprouts and length of the longest sprout. Moreover, as regards genotype, the longest sprout was recorded in Europa and Spunta in accordance with results of Carli et al who reported that clones with shorter dormancy often showed a greater length of their longest sprout [38]. Principal component analysis confirmed in particular that sprouting characteristics such as number of sprouts longer than 2 mm, the length of the longest sprout, and sprouting activity, were as affected by dormancy class as by breaking-dormancy treatments, and that probably there was a synergistic effect between the combination short-, medium-dormant varieties and 20 • C + GA 3 (T5, T6 in Exp-1, and U-T4 in Exp-2) breaking-dormancy treatment.…”

“…In Exp-2, analysis for ABA content was performed in different time intervals and specifically at the harvest of seed-tubers derived from potato plants removed early (5 June), at harvest of seed-tubers derived from undisturbed potato plants (30 June), before exposure to 32 • C, and tubers being cut in half (18 August), before exposure to 38 • C and before GA 3 application (24 August) and before seed-tuber planting (29 August). Physiological indicators, such as the sprouting capacity, and the length of the longest sprout were used to establish differences in dormancy release [38]. In Exp-1 on 30 tubers per variety and treatment (three replicates), sprout length measurements were taken and the length of the longest sprout was recorded every week.…”

The bacterial community in potato is recruited from soil and partly inherited across generations

“…Premature sprouting is one of the major causes of loss during postharvest storage of potato tubers [3, 4]. The sprouting behavior of potato tubers depends mainly on the plant genotype [5, 6], but it is also influenced by storage conditions, the type of field soil or environmental factors such as weather during growth [7, 8]. For example, tubers of the same potato variety grown in different fields often show differences in storage stability (personal communication with Austrian potato producers).…”

Study on Post Harvest Losses in Potato in Different Storage Conditions

“…Also, since the sprout depends on the tuber materials for growth, if there are several sprouts on the tuber, an inter-sprout competition for growth factors will be imposed by the size of the tuber. With fairly large tubers, no effect of size will be noticeable, but with decreasing size, as size is smaller, growth of sprouts will be lesser (Carli & Mihovilovich, 2010). In this research, tuber sizes used for experimentation were very small i.e.…”