Malaysian Applied Biology Journal

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Malays. Appl. BioL (1997) 26(2): 29-36



Department of Plant Protection, 43400 Universiti Putra Malaysia, Serdang, Selangor D.E., Malaysia


The population density of Ralstonia solanacearum significantly decreased with increased concentration of Ca(NO,), and subsequently with the increased pH of the growth media compared to the untreated control. Anatomical characters such as :ortex thickness and, length and diameter of xylem vessels did not differ significantly between Ca(NO3), treated anc untreated plants up to 30 days whereas significant difference of those characters were observed at 45, 60 and 75 days ol treatment. Histological study showed the deposition of Ca observed in the vessel walls, epidermal layer and sometimes ir the parenchyma tissues of the plants treated with Ca-fertilizers in the nursery and in the fields compared to the untreatec :ontrol plants.


Kepadatan populasi Ralstonia solanacearum berkurangan secara bererti dengan peningkatan kepekatan Ca(NO,)2 dan serikutnya dengan peningkatan pH bagi media pertumbuhan jika dibandingkan dengan kawalan yang tidak dirawat. Ciri anatomi seperti ketebalan kortex, panjang dan garis pusat vesel xilem tidak berbeza dengan bererti antara pokok yang di rawatan dengan Ca(NO,), dan yang tidak dirawat sehingga 30 hari, tetapi ciri-ciri tersebut berbeza dengan bererti apabila jilihat pada 45, 60 dan 75 hari selepas dirawat. Kajian histologi menunjukkan terdapatnya pelonggokan kalsium pada binding vesel, lapisan epidermis dan kadangkala pada tisu parenkima bagi pokok yang dirawat dengan baja kalsium di :apak semaian dan di ladang berbanding dengan pokok yang tidak dirawat.

Key words: Ca(NCK), Capsicum annuum, Ralstonia solanacearum, pH


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