Genetic variability studies for tuber yield and yield attributes in Ethiopian released potato (Solanum tuberosum L.) varieties

Abstract

Information on the extent of genetic variability and association among quantitative traits are vital for any crop improvement program and the development of suitable selection strategies. Limited research has been carried out thus far on potato genetic variability and trait association. This study on genetic variability and association among quantitative traits was conducted to assess the extent of genetic variability among yield and agronomic traits to identify superior varieties for the breeding program. To this effect, 20 improved varieties and a local cultivar were planted at two locations in central Ethiopia during the main cropping season of 2017/18 in a randomized complete block design using three replications. Analysis of variance of tuber yield and yield traits at each location and over locations, revealed the existence of highly significant (P < 0.01) differences among varieties in all agronomic and yield traits. Phenotypic coefficient of variation values ranged from 0.75% (specific gravity) to 32.22% (total starch yield) while the genotypic coefficient of variation values ranged between 0.70% (specific gravity) to 30.22% (total starch yield). Maximum difference between phenotypic and genotypic coefficient of variation values were noted for stem number, average tuber number, average tuber weight, number of leaves per plant and tuber yield. Hence, these traits are substantially influenced by the physiological status of the seed tuber at planting and by the environment, post emergence. Range of variability for most of the traits was high, indicating ample scope for selection and improvement in these traits. The estimated values for broad sense heritability and genetic advance, as percent of mean, ranged from 33.52% to 98.66% and 1.35% to 58.26%, respectively. All the traits had high heritability values, except average tuber number per hill, days to physiological maturity, average tuber weight and number of leaves per plant with moderate heritability values.

Assessment of Genetic Variability, Heritability and Genetic Advance for Quantitative Traits in Potato (Solanum tuberosum L.)

“…The result was also found earlier by Rangare & Rangare [8]. Prajapati et al [9] Tessema et al [10] and Tessema et al [11].…”

Study on Potato Bud Cultivation Techniques in a Greenhouse in Spring

“…Using different parts of the potato buds for direct planting, the emergence rate reached over 90%, among which the top bud emergence rate was as high as 98%, while the tail bud emergence rate was significantly lower than that of the bud block direct seeding treatment, showing a clear advantage of apical dominance. From the seedling stage to vigorous growth, the growth trend of the middle and tail bud treatments was delayed longer than that of the top bud, while the top bud direct cultivation treatment showed advantages such as vigorous growth, more leaves, strong photosynthetic ability, and higher yield, which is consistent with the principle that potato tubers have the strongest physiological and genetic potential at the top [19]. During the process of planting potato sprouts, ensuring the integrity of potato sprouts and their basal root primordia for planting is beneficial for the seedling growth rate, which is related to the occurrence and quantity of potato sprout root primordia [20].…”

RETRACTED: Variability among maize (Zea mays L.) inbred lines for agro- morphological traits

“…In our study, high heritability was found for plant height, ear height, total leaves, anthesis day, silking day, ASI, number of ears per plant, grain yield, thousand grain weight, number of kernel rows per ear, and number of kernels per kernel row, while low heritability was found for maturity day and disease score (Table 6). Plant breeders can choose the direction of selection using high heritability values (Bartaula et al 2019), which will be used as a guide in selection (Tessema et al 2022). The low heritability values of observed traits suggest that environmental influences on their traits (Dochtermann et al 2019;Mustakim et al 2019).…”