RESEARCH REGARDING THE INTRODUCTION OF A LEAST KNOWN VEGETABLE SPECIES … Number of leaves Bolting percentage (%) Head weight (kg) 40,00 30,00 20,00 10,00 0,00 0,80 0,70 0,60 0,50 0,40 0,30 0,20 0,10 40 y = 0,8909x - 0,0392 r = 0,97 0,00 0,50 0,55 0,60 0,65 0,70 0,75 0,80 0,85 0,90 Total weight (kg) Head weight Michihli Kingdom 80 Granat Nepa F1 Vitimo F1 Rosette 5,67 8,17 6,83 6,00 7,50 Head 16,17 27,50 14,83 19,83 27,17 Total 21,83 35,67 21,67 25,83 34,67 35,00 30,00 25,00 20,00 15,00 10,00 5,00 0,00 20,83 8,33 Fig. 6. Correlation between total and head weight n=5, p(5%)=0.88, p(1%)=0.96 12,50 0,00 29,17 12,50 Variant Fig. 7. Leaf layout Michihli Kingdom 80 Granat Nepa F1 Vitimo F1 Average Variant 20,83 12,50 One month after planting At harvest Fig. 8. Bolting percentage 8,33 0,00 18,33 6,67
J. Plant Develop. 18(2011): 41-45 41 ANDRO ANCA-RALUCA & al. COMPARATIVE BIOCHEMICAL AND PHYSIOLOGICAL RESEARCH ON TAXA OF MENTHA L. GENUS ANDRO ANCA-RALUCA 1 , BOZ IRINA 1 , PĂDURARIU CLAUDIA 1 , ATOFANI DOINA 1 , COISIN MAGDA 1 , ZAMFIRACHE MARIA-MAGDALENA 1 Abstract: The Mentha L. genus has many aromatic and medicinal taxa with a large area in our country. These taxa prefer flooded, swampy areas and wetlands, but they can also grow in moderate dry areas. Biochemical characteristics were obtained for 7 taxa from Mentha L. genus, wild or cultivated plants. The studies concerning the assimilative pigments, the hydric content, and the dry matter were determined for each vegetation stage. We used the gravimetric method for the hydric content and dry matter and the spectrophotometric method for estimation of the assimilative pigments. The results of the experiments are not the same for each taxon because of different harvesting periods and the ecological conditions of each taxon area. Key words: Mentha, assimilative pigments, dry matter, water Introduction Mentha genus includes herbaceous plants, perennial, aromatic, with a pungent odor characteristic, due to the volatile oil they contain. The Genus Mentha L. has a complex taxonomy, which makes it difficult to identify the species because of its phenotypic plasticity, genetic variability and because most species are able to produce hybrids by crossing. For example, the delimitation of the species Mentha spicata L. is problematic due to hybridization and doubling the number of chromosomes, especially when introgressive hybridization appears between some species in certain areas [HARLEY, 1972]. Due to their properties, these plants are used in pharmaceutical cosmetic and food industries. Photosynthetic pigments are known for their physiological role of protection against physical agents, such as blue and ultraviolet radiation, but also against biological agents [HOPKINS, 1985]. Water provides an environment for vital biochemical reactions. In metabolic processes it makes the enzyme activity and is involved in both biosynthesis and anabolic processes to catabolic processes of degradation [TOMA & JITĂREANU, 2000]. Materials and methods The material used in this paper is represented by seven taxa of the genus Mentha, cultivated or from spontaneous vegetation, collected in three phenophases: vegetative, flowering and senescence, during the vegetation period of 2010. The culticated taxa are: Mentha spicata L., Mentha piperita var. black Mitcham. and Mentha x piperita var. columna L. The spontaneous taxa were collected from the following locations: Caraorman, 1 Department of Plant Biology, Faculty of Biology, “Alexandru Ioan Cuza” University, 20A Carol I Boulevard, 700505, Iaşi – Romania, tel. 40(0)232201072, e-mail: anca_andro@yahoo.com
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in italics. A certain volume must b