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Sunflower (Helianthus annuus L.) is one of the most valuable agricultural products, mainly cultivated for edible oil. Phosphorus is a suitable nutrient in plants that plays key roles in several cellular structures and catalytic functions of enzymes involved in metabolism. In order to produce and develop phosphorus-efficient cultivars, 100 sunflower lines from different parts of the world were evaluated in an experiment based on agro-morphological traits under two optimal and phosphorus deficient conditions in a completely randomized design with three replications in pots in 2017-18 cropping season. Based on results of descriptive statistics, the average of most studied traits was reduced in phosphorus deficient compared to optimal conditions, and the most damage caused by phosphorus deficiency were observed in plant phosphorus percentage, grain yield per plant and head and plant dried weights, respectively. In population structure analysis based on 128 IRAp and 120 REMAP markers, two sub-populations (K=2) were identified in association panel and amount of linkage disequilibrium for the retrotransposon based molecular markers was 3.4%. In association analysis using MLM model, 17 and 19 markers were identified for traits in optimal and phosphorus deficient conditions, respectively and the cfcr8-1 marker was common between traits in optimal and phosphorus deficient conditions. The results obtained from this study present valuable information on the genetic basis of studied traits that can be used for breeding and developing high performance varieties in sunflower. [ABSTRACT FROM AUTHOR]

Copyright of Iraqi Journal of Desert Studies is the property of Republic of Iraq Ministry of Higher Education & Scientific Research (MOHESR) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

This study was conducted in the vegetable farm/Hort. & land scape Dept./College of Agric. & Forestry / Mosul Univ. to study the effect of two levels of phosphate fertilization, zero, 40 kg P2O5/Donum, and spraying with three levels of seaweed extract, kelp 40, Zero, 2,4 ml/l in two pea cultivars namely: "Little Marvel and Fabreca". Plants were sprayed twice, the first one at 3-5 true leaf stage, whereas the second after 15 days from the first spraying. Results indicated that phosphate fertilization & seaweed extract showed a clearly effects in TSS, protein percentage of seeds, nitrogen & phosphorus concentrations of leaves, in addition to number of root nodules/plant. Phosphate treatment gave the highest protein percentage (30.08%), while spraying with 4 ml/l of seaweed extract resulted in the highest values of nitrogen, phosphorus concentrations in leaves, and the large number of root nodules/plant. The results revealed also that cultivars varied between them in all parameters studied.

This study was conducted in the vegetable farm/Hort. & land scape Dept./College of Agric. & Forestry / Mosul Univ. to study the effect of two levels of phosphate fertilization, zero, 40 kg P2O5/Donum, and spraying with three levels of seaweed extract, kelp 40, Zero, 2,4 ml/l in two pea cultivars namely: "Little Marvel and Fabreca". Plants were sprayed twice, the first one at 3-5 true leaf stage, whereas the second after 15 days from the first spraying. Results indicated that phosphate fertilization & seaweed extract showed a clearly effects in TSS, protein percentage of seeds, nitrogen & phosphorus concentrations of leaves, in addition to number of root nodules/plant. Phosphate treatment gave the highest protein percentage (30.08%), while spraying with 4 ml/l of seaweed extract resulted in the highest values of nitrogen, phosphorus concentrations in leaves, and the large number of root nodules/plant. The results revealed also that cultivars varied between them in all parameters studied. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Kirkuk University for Agricultural Sciences is the property of Republic of Iraq Ministry of Higher Education & Scientific Research (MOHESR) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)