Variability of nucleic acids content in the leaves of Tămâioasa Românească grapevine variety

Abstract

The paper presents the variability of the DNA and RNA content of a mature leaf belonging to the Tămâioasă românească grapevine cultivar. The analyse has been effectuated in four phenological phases: unbudding, flowering, ripening, full maturation of grapes. On constate that at unbudding, the nucleic acids content is maximum, because in this phases, the proteinic synthesis are very intense for cell organits biogenesis. În other phases, the content in DNA and RNA diminish very much. Therefore, the content of DNA and RNA is maximum at unbudding and minimum at full maturation of grapes. The content of DNA in vegetal cell is relative constant, between certain limits, while the content of RNA is enough variable. During the vegetation period, DNA content in the mature leaf of Tămâioasă românească grapevine variety is much higher compared to RNA content. The variability of DNA content is more restricted compared to the one of RNA content. RNA/DNA ratio from mature leaf of Tămâioasă românească grapevine variety is maximum at the phenological phase of full maturation of grapes and minimum at the phenological phases of flowering. The estimate of proportion between of contents in RNA and DNA in mature leaves at Tămâioasă românească grapevine variety permit certain observations regard at the complexity of the genotype analised