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Genotype and abscisic acid (ABA) interaction on tuber dormancy and sprouting were studied in the tubers of eleven potato genotypes during ambient storage. Tubers were harvested and hardened for ten days in the fields. Tuber weights were measured. Tubers were then stored after three treatments: 1) untreated tubers as such; 2) tubers treated with ABA solution, 3) tubers treated with water. During storage, dormancy length was measured. The longest sprout length and sprout numbers were measured at 30, 37, 42, 45, 50 and 60 d after storage. Tuber rottage was measured at 72 d after storage. Results found tubers of Lady Rosetta and Kufri Sindhuri having low tuber weights and longer dormancy duration while lesser sprouting and rottage compared to other genotypes. ABA treatment increased dormancy duration in Lady Rosetta, Kufri Neelkanth, Kufri Frysona, and Kufri Sindhuri. ABA treatment reduced sprouting in Kufri Neelkanth, Kufri Frysona, Kufri Chipsona 1, Kufri Ganga, Lady Rosetta, MP/06 39 and MS/8 1148. ABA treatment decreased rottage in Kufri Pukhraj, Kufri FryoM, Kufri Frysona, MS/8 1148, Kufri Neelkanth, Kufri Chipsona 1 and Kufri Sindhuri. Results indicated that tubers of Lady Rosetta and Kufri Sindhuri could be storable at ambient temperature compared to other genotypes. ABA treatment of tubers may improve tuber storage under ambient conditions in potato. [ABSTRACT FROM AUTHOR]

In processing industries of chip making, potato is crucial raw material for higher economic returns, so quality and storage of potato plays important role to provide superior quality product in the market. However, agronomic technologies in this crop is lacking, so modifications were made through potassium and growth regulators were made to get good results in required crop cycle Field experiments were done from 2017-18 at the Khalsa College Amritsar, Punjab, India, to assess differences due to gibberellic acid and potassium management on potato. Treatments consisted of gibberellic acid treatments: control (G1), GA3 seed application (G2) and GA3 foliar application (G3) and five potassium nutrition management treatments consisting of control (K1), 100%inorganic K (K2), 75% inorganic K+K-biofertilizer (K3), 50% inorganic K+K-biofertilizer (K4) and K-biofertilizer (K5). The GA3 treatments did not affect any quality attributes or post-harvest loss. There was an increment in processing quality with potassium nutrition treatments (K2 and K3) expect in certain quality parameters such as total phenols, ascorbic acid, total soluble solids, and chip color. Chip color lightens with application of potassium; minimum post-harvest loss occurred with K2 and K3 treatments when tubers were kept for short-term storage after harvest. At the end of the storages sprouting was decreased with potassium treatment. [ABSTRACT FROM AUTHOR]

Tubers collected from different cold stores of Punjab were analyzed for the presence of dry rot infection. Highest disease incidence was recorded in seed lots collected from district Jalandhar (3.3 to 90.0%) followed by Hoshiarpur (22.5-50.0%). On subsequent isolations made from infected samples yielded twenty four isolates (F1 to F24) of Fusarium spp. They were identified on the basis of morphological and cultural characters and confirmation of the species was also done by primers specific for four different Fusarium spp. (F. coeruleum, F. sulphureum, F. culmorum and F. avenaceum) known to be associated with dry rot of potato. On the basis of morphological, cultural characters and PCR results F1 - F11 isolates were identified as F. avenaceum; whereas F16, F18 to F24 isolates were identified as F. culmorum. The amplicons of 294 and 592 bp were obtained by primers specific for F. avenaceum and F. culmorum, respectively. Five isolates F12 - F15 and F17 were identified as Fusarium sambucinum on the basis of cultural and morphological characters only which needs further investigations. All the isolates were tested for the pathogenicity on asymptomatic potato tubers of cv. Kufri Pukhraj at two different temperatures i.e. 4°C and 10°C. F. culmorum was found more virulent followed by F. avenaceum and F. sambucinum, causing significantly larger lesions at both 4°C and 10°C storage temperatures. Most virulent isolates of different Fusarium spp. were used to test disease reaction on six common cultivars of potato. Gautama cultivar was found highly susceptible to dry rot followed by Kufri Pukhraj. [ABSTRACT FROM AUTHOR]

The article discusses research on loss of ascorbic acid during storage of potato tubers. Topics discussed include enhancement in the absorption and internal transport of dietary iron and zinc from other plant sources with the help of ascorbic acid due to its reducing property in the plant metabolism, investigating the changes in ascorbic acid content of potato tubers of several varieties, and presence of maximum ascorbic acid content at zero day of storage.

Considerable quantities of potato (Solanum tuberosum L.) are transported to different consumer centers through out the country and also exported to neighboring countries. Sprouting of potatoes is the major post-harvest limiting factor. Sprout inhibition treatment with isopropyl 3-chlorophenyl carbamate (CIPC) was evaluated under ambient conditions (20 to 35°C, 44 to 86% RH) in five potato varieties viz. Kufri Chipsona-1, Kufri Surya, Kufri Jyoti, Kufri Pukhraj and Kufri Bahar after harvest and after storage at 2-4°C for four months. CIPC treatment (15 and 20 mg a.i./kg tuber weight) significantly reduced sprouting and total losses in freshly harvested potatoes of all the varieties up to 60 days. Whereas in cold stored potatoes, CIPC treatment was effective at higher concentrations (25 and 30 mg a.i. /kg tuber weight) in only two varieties. Nevertheless, the treatments could usefully extend the shelf life of potatoes by 30 to 45 days. CIPC treatment reduced sugar contents and improved the chip colour. Freshly harvested potatoes of Kufri Chipsona-1 can be marketed as table as well as processing potatoes, while other cultivars were suitable for table purpose only. Cold stored potatoes can be marketed only as table potatoes. CIPC residues were below the permissible limits and potatoes were safe for human consumption. The information is of high practical utility to market/export potatoes to distant markets. [ABSTRACT FROM AUTHOR]