The Effect of Photoperiod on the Biomass and Quality Variables of Certain Origanum spp.

Öz

The biomass and essential oil yield of Origanum vulgare var. hirtum and O. syriacum were investigated under 10 h, 13 h and 16 h fluorescent light with a temperature of 25°C (77 F) in the growth chamber. The effect of different photoperiods to the yield and quality variables of both species were recorded. The observations were taken from early flowering stage of the plants. The highest plant height was obtained from O. syriacum with 13h photoperiod as 32.78 cm. The maximum number of shoot was recorded at O. vulgare var. hirtum. as 14.3 per plant from 13h. The maximum canopy diameter was received from O. syriacum at 10h, and the measurements in horizontal and vertical directions were 28.63 cm and 25.73 cm, respectively. This application also had the highest essential oil content with 2.09%. After transplanting these both species’ pots to the fields (ALC, Agricultural Learning Center, UMass, Amherst) three different cuttings were carried out, the highest carvacrol yield was determined from the late fall harvest of O. vulgare var. hirtum with 74.55%, and O. syriacum with 33.35%.

Anahtar Kelimeler

• Origanum vulgare var. hirtum,Origanum syriacum,photoperiodism

Gün Uzunluklarının Bazı Kekik (Origanum Spp.)Türlerinde Biyolojik Kütle ve Kalite Özelliklerine Etkisinin Araştırılması

Öz

Origanum vulgare var. hirtum (İstanbul kekiği) ve O. syriacum (Suriye kekiği) olarak ta adlandırılan iki kekik türünün 10, 13 ve 16 saat süreyle iklim dolabında 25°C’de floresan ışığına maruz bırakılmalarının türlerin bazı büyüme parametreleri ile herba verimleri ve uçucu yağ özellikleri üzerine olan etkileri araştırılmıştır. Farklı fotoperiyodik muamelelerin verim ve kalite üzerine etkileri kaydedilmiştir. Gözlemler bitkilerin ilk çiçeklenme dönemlerinden alınmıştır. En yüksek bitki boyu O. syriacum’ da 13 saatlik gün uzunluğundan 32.78 cm olarak elde edilmiştir. En fazla sürgün sayısı bitki başına ortalama 14.3 ile O. vulgare var. hirtum’dan 13 saatlik fotoperiyodizm den elde edilmiştir. Kanopi çapı en geniş tür O. syriacum olmuş, yatay ve dikey genişliği en yüksek çapı 28.63-25.73 cm ile 10 saat ışıklandırılan saksılardan elde edilmiştir. En yüksek uçucu yağ verimi %2.09 ile yine bu muameleden elde edilmiştir. Her iki türe ait saksıdaki bitkiler, Masachusetts Üniversitesi’nin araştırma Uygulama çiftliği’nde tarla denemelerine alınmışlar ve sonrasında bu bitkilerden üç farklı tarihte hasat gerçekleştirilmiştir. Bu biçimler göz önüne alındığında en yüksek karvakrol oranına sahip tür %74.55 ile geç sonbahar hasatından Origanum vulgare var. hirtum’ dan, % 33.35 ile de O. syriacum’ dan elde edilmiştir.

Anahtar Kelimeler

• Origanum vulgare var. hirtum,Origanum syriacum,fotoperiyodizm- gün uzunluğu

Kaynakça

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