246 AGRIVITA Journal of Agricultural Science. 2019. 41(2): 246–255 AGRIVITA Journal of Agricultural Science www.agrivita.ub.ac.id Crossing Among Sixteen Sweet Potato Parents for Establishing Base Populations Breeding Sri Umi Lestari 1*), Ricky Indri Hapsari 1) and Nur Basuki 2) 1) Faculty of Agriculture, Tribhuwana Tunggadewi University, Malang, East Java, Indonesia 2) Faculty of Agriculture, University of Merdeka Pasuruan, East Java, Indonesia ARTICLE INFO ABSTRACT Keywords: The base - population of the controlled cross breeding is one of the Capsule important factors to develop a new improved cultivar. Since the Cross-compatibility incompatible nature of sweet potato remains a barrier for genetic Female-parent improvement, therefore it requires a lot of crossed pairs. This study Seed set aimed to determine the level of incompatibility among crossing line Sweet potato between high yielding and micronutrient content cultivars. The field experiment conducted at Brawijaya University Research Station, Article History: Jatikerto-Malang, during February to August 2015. The North Carolina Received: June 19, 2017 Design II was applied to sixty pairs controlled cross breeding and Accepted: May 6, 2019 their sixty reciprocal pairs of six cultivars for micronutrient content enrichment with ten high yielding cultivars. The observations were ) * Corresponding author: made to the cross flowers number, capsules, fruit sets, and seeds E-mail:
[email protected] number. The level of incompatibility between crossed pairs was determined by the level of fruit set. The result showed that most pairs were compatible (fruit set > 20%) and only few were incompatible (fruit set < 10%). Among six parents with micronutrient content enrichment, two of them, have a high compatibility as as female parents, to all the high yielding cultivars, i.e.