Physiological effect of some antioxidant polyphenols on sweet marjoram (Majorana hortensis) plants

ABDALLA EL-MOURSI, IMAN MAHMOUD TALAAT, LAILA KAMAL BALBAA

Abstract.  El-Moursi  A,  Talaat  IM,  Balbaa  LK.  2012.  Physiological  effect  of  some  antioxidant polyphenols  on  sweet  marjoram (Majorana hortensis) plants. Nusantara Bioscience 4: 11-15. Two pot experiments were conducted in the screen of the National Research Centre, Dokki, Cairo, Egypt to study the physiological effect of foliar application of some antioxidant polyphenols on growth and chemical constituents of sweet marjoram plants (Majorana hortensis L.). Plants were treated with curcuminoids, cinnamic acid and salicylic acid, each at 5 and 10 mg/L except the control plants.The results indicate that foliar application of curcuminoids increased growth parameters under study. Total sugars were also increased as a result of foliar application of curcuminoids. On the other hand, oil %, oil yield and nitrogen % were decreased as a result of curcuminoids treatments. Cinnamic acid at 5 mg/L resulted in the tallest plants in most cases. Application of cinnamic acid at 10 mg/L signicantly increased oil % and total oil yield/plant. Sugar content followed the same trend. Treatment of sweet marjoram plants with salicylic acid significantly increased oil % and oil yield, especially in plants treated with 10 mg/L SA. Total sugars % and total nitrogen % followed the same trend. The main constituents of the plant essential oil were also markedly affected.

Key words: sweet marjoram, antioxidant polyphenols, curcuminoids.

Abstract. El-Moursi A, Talaat IM, Balbaa LK. 2012. Pengaruh fisiologis beberapa polifenol antioksidan terhadap tanaman marjoram manis (Majorana hortensis). Nusantara  Bioscience 4: 11-15. Dua percobaan  pot telah  dilakukan  di rumah  kaca Pusat Penelitian Nasional, Dokki, Kairo, Mesir untuk mempelajari pengaruh fisiologis aplikasi foliar beberapa polifenol antioksidan pada pertumbuhan dan kandungan kimia tanaman marjoram manis (Majorana hortensis L.). Tanaman diperlakukan dengan kurkuminoid, asam sinamat dan asam salisilat, masing-masing sebanyak 5 dan 10 mg/L, kecuali tanaman kontrol. Hasil yang diperoleh menunjukkan bahwa aplikasi foliar dari kurkuminoid meningkat parameter pertumbuhan tanaman yang diteliti. Total gula juga meningkat akibat aplikasi foliar kurkuminoid. Di sisi lain, persentase minyak, hasil minyak dan persentase nitrogen menurun akibat perlakuan kurkuminoid. Perlakuan asam sinamat pada 5 mg/L menghasilkan tanaman tertinggi dalam keseluruhan percobaan. Perlakuan asam sinamat pada 10 mg/L secara signifikan meningkat persentase minyak dan kandungan minyak total/tanaman. Kadar gula menunjukkan kecenderungan yang sama. Perlakuan tanaman marjoram manis dengan asam salisilat secara signifikan meningkatkan persentase minyak dan kandungan minyak yang dihasilkan, terutama pada tanaman yang diperlakukan dengan asam salisilat sebanyak 10 mg/L. Total persentase gula dan total persentase nitrogen menunjukkan kecenderungan yang sama. Konstituen utama dari minyak atsiri tanaman juga sangat terpengaruh.

Key words: marjoram manis, polifenol antioksidan, kurkuminoid.

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