The experiment was conducted in 2010 and 2011 to evaluate and characterize fifteen in-country sweet potato accessions for root characteristics and root yield, plant habits, ground cover, severity of root damage by Cylas puncticollis and Meloidogyne incognita and identify duplications. Significant differences (P<0.05) were observed for number of roots per plot, salable roots per plot, unsalable roots per plot and root yield. The highest number of roots per plot, salable roots and root tuber yield were given by E 10 , followed by B 21 while the lowest came from E 17 . The result indicated B 26 as highly susceptible to C. puncticollis, E 3 , E 11 , E 6 , E 27 and TIS 87/0087 were resistant, while B 6 , E 5 , B 2 , E 17 , B 21 , E 14 , E 7 , B 23 and E 10 were highly resistant to the pest. Seven accessions (E 5 , B 6 , B 2 , E 14 , E 7 , B 23 and E 10 ) were highly resistant, five accessions (E 3 , B 26 , E 11 , E 2 and TIS 87/0087) showed moderate resistance while B 2 , E 6 and E 17 were highly susceptible to root knot disease. Ground cover of less than 50% was identified with B 21 (erect type), the semi-erect types (E 5 , E 6 , and B 23 ) had ground cover of 50-75%, while the spreading types (B 6 , B 2 , E 11 , E 17 , E 14 and E 7 ) had 76-90% ground cover. The extremely spreading types (E 3 , B 26 and E 27 ) had more than 90% ground cover. Six accessions (E 5 , E 3 , E 6 , E 14 , B 23 and E 10 ) had white skin, seven (B 6 , B 26 , B 2 , E 27 , E 17 , E 7 and TIS 87/0087) were pale pink while two (E 11 and B 12 ) were pink. The root flesh of one accession (B 6 ) was white, three yellow, while the remaining eleven accessions were creamy, and E 27 and TIS 87/0087 were duplicates.
Experiment was conducted in the rainforest agro-eco-zone of Southeastern Nigeria under rain fed condition at the sweet potato breeding ground of National Root Crops Research Institute, Umudike, Nigeria to generate 10,000 botanical seeds for further evaluation for high root yield, dry matter and micro-nutrient content, to identify high flowering parent(s) and to select compatible parent(s) for further genetic recombination. The treatment which consisted of 14 parents of bi-parental crossing was laid out in a randomized complete block design with seven parents, each per plot per block and replicated three times while the other seven parents were maintained in different plots as pollen donors. Data collected were on: total number of emerged flowers visually counted, total number of flowers covered, total number of flowers pollinated, total number of capsules formed, total number of flowers aborted, total number of seeds obtained from crosses, number of good seeds, number of unfilled seeds, percentage of good seeds. Data collected were statistically analyzed using Statistical Package for Social Sciences (SPSS, version 15.0). Differences between means were tested using analysis of variance (ANOVA) while means separation was done using standard error of difference means at 5% probability. The results obtained showed that despite the seemingly high total number of flowers produced from the controlled crosses (14520), only 17.4% of this figure yielded good seeds. The objective of realizing 10,000 botanical seeds through the hand pollination was not achieved as a result of high flower abortion arising probably from moisture stress which was severe during seed filling. The variety Tio-joe gave the highest flower production of 2334. The relatively high number of capsules of 347obtained from the cross between UMUSPO 3 and NRSP/2 indicated high compatibility between the two parents which suggested that the two parents could be used for further recombination for micro-nutrient enhancement.
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