Genetic parameters resistance of several genotypes and f1 crossing results of papaya plant (Carica papaya L.) on mealybug pest (Paracoccus marginatus) with no choice test method
Paper Details
Genetic parameters resistance of several genotypes and f1 crossing results of papaya plant (Carica papaya L.) on mealybug pest (Paracoccus marginatus) with no choice test method
Abstract
The efforts to obtain genetic information and resilience of several papaya genotypes, so the resistant genotypes are selected.This study aims to obtain information on the genetic parameters and best resistance level of papaya plants against the mealybug (Paracoccus marginatus) using no choice test method. The research was conducted in Cot Cut Village, Aceh Besar District, Pest Laboratory and Weed Science Laboratory, Faculty of Agriculture, University of Syiah Kuala from September 2017 to January 2018 and used Completely Randomized Design (CRD) non-factorial pattern with plant genotype as treatment. Each genotype was repeated 3 times with 5 samples per repetition. Papaya seedlings used were 11 genotypes, 7 genotypes of which were from previous crosses from 4 elders: Dapina (USK7), Carisya (USK1), Calina (USK4) and Carmida (USK6). The results showed the lowest intensity of attack was in USK1 genotype of 37.65% and the lowest number of ovisac was found at USK7 with value 7.18. High heritability values are found in plant height, length of petiole and dry weight. There is a significant correlation on all plant growth characters with the intensity of the attack with the highest value on the leaf area index character with the intensity of the attack with a very real value of -0.73. There were no genotypes with the resistant category, but genotypes were found with rather resistant categories that could be considered for selection.
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