Turkish Journal of Field Crops

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2. Beyler İş Hanı, No: 313 Kat: 3 Konak-İzmir

ASSESSMENT OF NUCLEAR DNA CONTENTS VARIATION AND THEIR RELATIONSHIP WITH FLOWERING IN CORN GENOTYPES

Gonul COMERTPAY

Abstract

Genome size variations are very helpful to provide an understanding of the diversification, evolution and ploidy screening of germplasm and investigate the aneuploidy, cell cycle kinetics, and reproductive pathways for the plants. It is observed that variation in the DNA content has a direct effect on the phenotype of a plant. Flowering time is considered one of the critical adaptation parameters for maize (Zea mays L.), and this study aimed to investigate the DNA content and its relationship with the flowering time in this crop. A total of 19 inbred lines and three hybrids adapted to temperate and tropical regions with early, late and very late flowering were used as plant material. Their DNA content was determined using flow cytometry, and Vicia sativa as standard for the comparison of DNA content. The DNA content of the studied material of corn ranged from 5.508 pg to 6.285 pg, with an average value of 5.817 pg. The Highest DNA content was determined in the Tzi8 inbred line belonging to a group of very late flowering. A highly significant and positive correlation was found between DNA content and flowering time, which was confirmed with a regression analysis. The results of the study revealed that increasing the DNA content resulted in delayed flowering, and inbred lines adapted to tropical regions had a higher DNA content.

Keyword: Corn, correlation, DNA content, flowering time ,

Effects of Different Water Stress Levels on Biomass Yield and Agronomic Traits of Switchgrass (Panicum virgatum L.) Varieties under Semi-Arid Conditio

Erdal GONULAL, Suleyman SOYLU, Mehmet SAHIN

Abstract

A field experiment was conducted in the Wielkopolska region at the Gorzyń Research Station, Poland (52.34°N, 15.54°E) in Central Europe. The study was conducted over a 3-year period (2017, 2018, 2019) as a two-factorial design with four replications in the RCBD. The aim of the research was to determine the effect of the cultivar (‘Bolero’, ‘Tytan’) and the inoculation (Nitragina–seeds inoculation, Nitroflora I–seeds inoculation, Nitroflora II–soil inoculation, HiStick® Lupin–seeds inoculation) on plant development, seeds chemical composition and yielding of narrow-leaved lupin. The weather conditions and experimental factors significantly influenced on productivity of narrow-leaved lupin ‘Tytan’. Drought during the growing season reduced seeds and protein yields. After inoculation of HiStck the seeds yield was significantly greater by 12.4% (p < 0.01) and the protein yield after application of Nitroflora I or HiStick by 13.9% (p < 0.01) and 19.2% (p < 0.01), respectively. Correlation coefficients showed strong relations between number of pods and seeds per plant in both cultivars regardless of the inoculation variant, however the strongest relations in both cultivar were proved on HiStick treatment.
Keyword: Biological nitrogen fixation, chemical composition, legumes, protein efficiency, yielding