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Marjoram physiological and molecular performance under water stress and chitosan treatment

100%

Al-Ghamdi A. A.

nr 04

Chitosan as natural product might have potential application in the production of Origanum majorana “Marjoram”, a known historic plant with economic importance in the agriculture and pharmaceutical industries. Under three irrigation periods (1, 3, and 5 days) in marjoram plants for 8 weeks, chitosan was applied as water solution at 50, 200 and 500 ppm. Chitosan increased selected morphological parameters and associated with elevated physiological and molecular performance. Enhanced metabolism of the treated plants was expressed as increased rates of stomatal conductance and photosynthetic rates. In addition, soluble sugars and proline levels were higher. Elevated expression of MnSOD Cu/ZnSOD, FeSOD, APX, DREB2 and ERF3 s were also detected. Further elevated expression of CYP71D179/182 and CYP71D178 PII, essential oil composition-related genes, was also found. The SOD and APX enzymes were more active and there were reductions in the levels of reactive oxygen species. Thymol and cis-Sabinene were higher in treated plants essential oils. Chitosan may alleviate water stress in marjoram by enhancing the metabolism and stress related genes in treated plants.

Nectar of Ziziphus spina-christi (L.) willd (Rhamnaceae):dynamics of secretion and potential for honey production

45%

Nuru A. , Awad A. M. , Al-Ghamdi A. A. , Alqarni A. S. , Radloff S. E.

Journal of Apicultural Science

2012

tom 56

nr 2

Optical investigations of microwave induced synthesis of zinc oxide thin-film

45%

Ansari A. R. , Hussain S. , Imran M. , Al-Ghamdi A. A. , Chandan M. R.

tom Vol. 36, No. 2

304--309

In this article, ZnO thin-film deposition on a glass substrate was done using microwave induced oxygen plasma based CVD system. The prepared thin-films were tested in terms of crystallinity and optical properties by varying the microwave power. The effect of power variation on the morphology and size of final products was carefully investigated. The crystal structure, chemical composition and morphology of the final products were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-Vis spectroscopy, Raman spectroscopy and photoluminescence (PL). This technique confirmed the presence of hexagonal ZnO nanocrystals in all the thin-films. The minimum crystallite grain size as obtained from the XRD measurements was ~9.7 nm and the average diameter was ~18 nm.