Paper Details

Evaluation of potato mini-tubers dormancy breaking affected by various chemicals, genotype and mini-tuber Size

Mozhgan Sadat Mohammadi, Ali Kashani, Saeed Vazan, Farshid Hasani

DOI: https://dx.doi.org/10.12692/ijb/4.6.100-108

Int. J. Biosci. 4(6), 100-108. March, 2014. (PDF)

Abstract:

This work was done in order to evaluation the effect of gibberellic acid to potato mini-tubers dormancy breaking at Seed and Plant Certification and Registration Institute of Karaj (SPCRI) in form of factorial based on randomized completely design in three replication at 2011. Experimental factors were considered chemicals as the first factor in four levels (control, 50 g/lit gibberellic acid, 25 mlit/m3 carbon disulfide, 3% thiourea), potato cultivars as the second factor in two levels (agria and born) and potato mini-tuber size as the third one in four levels (12-20 millimeter, 20-25 millimeter, 25-30 millimeter and 30-35 millimeter). In this experiment characteristics such as sprout length, days to sprouting and days to breaking dormancy were studied. The results of this experiment showed that the main and interactions effects of three factors were affected statistically significant on days to sprouting with probability level of 99%. Sprout length affected by main and interaction effects of experimental factors too. Also dormancy period length showed significant differences about application of chemicals treatments, different seed cultivars and different sizes of potatoes seed noted in 99% probability level. In general it can be stated that application of gibberellic acid left greatest effects among the used chemicals. Also Dormancy period length had greater reduction than other chemicals by application of gibberellic acid. Difference seed cultivars and sizes showed significant differences in their response due to genetic and physiological characteristics. In fact, based on these test’s results can be declared that application of gibberellic acid lead to reduce the time between planting and germination of tubers, to increase sprout length and to reduce the potato seed dormancy period length.