3 (4) 2019, OCTOBER, 2019
Pages: 9-22
Association between traits in potato for the assessment of drought tolerance under moisture deficit areas of North Western Ethiopia
Author: Berhan Gashaw and Wassu Mohammed
Category: Plant breeding
[Download PDF]
Abstract:
Understanding correlation of different traits provides more reliable criterion for selection program to achieve its goal for high yield. Hence, estimation of traits correlation is pivotal in the process of variety development. The experiment conducted at Adet Agricultural Research Center, Simada a satellite site for drought experiments, in 2016 main rain season to estimate association among yield and yield affecting traits of 105 potato genotypes comprised five checks. Augmented design was used and data were collected for 20 traits. The analysis of variance revealed the presence of highly significant (P< 0.01) differences among genotypes for all traits except plant height and small and medium size tubers percentage. Marketable and total tuber yield ranged from 10.81 to 38.99 and 13.92 to 41.79 ton ha-1, respectively. The highest total tuber yield recorded by genotype 20SET4.2 (41.8 ton -1ha) followed by 20SET4.1 (39.1) 16SET5.5 (37.5) while the best check (Belete) gave 27.7ton -1ha. Total tuber yield showed significant and positive correlation with leaf area, tuber number per plant, tuber yield per plant, marketable tuber yield, bulking rate, large size tubers percentage and average tuber weight, but significant negative correlation was observed with very small tuber percentage. Tuber quality parameters (tuber dry matter, specific gravity and total starch content) had strong and positive genotypic association among them and also they had positive phenotypic correlation Thus, selection for positively correlated traits will simultaneously increase the total tuber yield of potato.
Keywords: : Augmented design, correlation, potato, drought
|
